Tables I, II, and III list the results of water tests performed by the LADWP and MWD from January to December 2022. LADWP tests for over 200 substances. These tables include only substances with values that are detected. No substance was detected above the primary maximum contaminant level.

How to Read the Tables

The substances found in the water served in your area are listed as follows:

  • For San Fernando Valley Area – water test results are under the Los Angeles Aqueduct Filtration Plant (LAAFP), the Northern Combined Wells (NCW), and the Metropolitan (MWD) Jensen Filtration Plant columns.
  • For Central Los Angeles Area – water test results are under the LAAFP and the Southern Combined Wells (SCW) columns.
  • For Western Los Angeles Area – water test results are under the LAAFP column.
  • For Harbor/Eastern Los Angeles Area – water test results are under the MWD Weymouth, Diemer, and Jenson Plants columns.

2022 LADWP Drinking Water Quality Monitoring Results Tables
 

    Abbreviations
    ACU apparent color unit
    CFU/mL colony-forming unit per milliliter
    < less than the detection limit for reporting purposes
    µg/L micrograms per liter (equivalent to ppb)
    µS/cm microSiemens per centimeter
    mg/L milligrams per liter (equivalent to ppm)
    NTU nephelometric turbidity units 
    NA not applicable
    NR not reported
    NT not tested
    NUM/100 mL number per 100 milliliter
    % percentage
    pCi/L picoCuries per liter
    TON threshold odor number
    Terms

    Compliance: A drinking water standard based on the health risk (primary standards) and aesthetic (secondary standards) exposure of a contaminant to consumers. For example, bacteria and nitrate have strict limits that must be met at all times due to the acute effects they can cause. Other standards, like small amounts of disinfection by-products and man-made chemicals, have standards that are based on a lifetime of exposure because the risk to consumers is very low. Compliance with most standards is based on an average of samples collected within a year. This allows for some fluctuation above and below the numerical standard, while still protecting public health.

    Regulatory Action Level (AL): Concentration of a contaminant which, if exceeded, triggers treatment or other requirements that a water system must follow.

    Federal Minimum Reporting Level (MRL): Minimum concentration of a contaminant which can be detected in drinking water using analytical methods established by the U.S. EPA. Data reported in Table IV reflect MRLs.

    Maximum Contaminant Level (MCL): Highest level of a contaminant that is allowed in drinking water. Primary MCLs are set as close to the PHGs (or MCLGs) as is economically and technologically feasible. Secondary MCLs are set to protect the odor, taste, and appearance of drinking water.

    Maximum Contaminant Level Goal (MCLG): Level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs are set by the U.S. EPA.

    Maximum Residual Disinfectant Level (MRDL): Highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.

    Maximum Residual Disinfectant Level Goal (MRDLG): Level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the beneficial use of disinfectants to control microbial contaminants. MRDLGs are set by U.S. EPA. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants

    Notification Level (NL): Health-based advisory level established by SWRCB-DDW for chemicals in drinking water that lack MCLs.

    Primary Drinking Water Standard (PDWS): MCLs, MRDLs and treatment techniques (TTs) for contaminants that affect health, along with their monitoring and reporting requirements.

    Public Health Goal (PHG): Level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency.

    Secondary Maximum Contaminate Level (SMCL): Highest level a constituent allowed in drinking water that may affect the taste, odor or appearance. SMCLs are set by the U.S. EPA.

    State Detection Limit for Reporting (DLR): A detected contaminant at or above its detection level for reporting purposes. DLRs are set by the SWRCB-DDW. Data reported in Tables I through III reflect DLRs.

    Treatment Technique (TT): Required process intended to reduce the level of a contaminant in drinking water. For example, the filtration process is a treatment technique used to reduce turbidity (cloudiness in water) and microbial contaminants from surface water. High turbidities may be indicative of poor or inadequate filtration.
     

    Table I (A)
    Calendar Year 2022 Water Quality Monitoring Results

    Table I (A)  – Health-based Primary Drinking Water Standards:
    MCLs, PHGs, and Major Sources of Substances in Drinking Water

    Substances

    Major Sources in Drinking Water

    Units

    State Primary
    Standard MCL

    State
    PHG
    Aluminum Erosion of natural deposits;
    residue from surface water treatment processes

    µg/L

    1000

    600
    Arsenic Erosion of natural deposits

    µg/L

    10

    0.004
    Barium Erosion of natural deposits

    µg/L

    1000

    2000
    Bromate (b) Byproduct of ozone disinfection;
    formed under sunlight for chlorinated water

    µg/L

    10

    0.1
    Fluoride Erosion of natural deposits;
    water additive that promotes good dental health

    mg/L

    2

    1
    Gross Alpha
    Particle 
    Activity (c)    		 Naturally present in the environment

    pCi/L

    15

    none
    Gross Beta
    Particle 
    Activity (c)    		 Naturally present in the environment

    CFU/mL

    50

    none
    Heterotrophic Plate
    Count Bacteria    		 Naturally present in the environment

    µg/L 

    TT

    none
    Nitrate (as N) Erosion of natural deposits;
    runoff and leaching from fertilizer use

    mg/L

    10

    10
    Nitrate + Nitrite
    (as N)    		 Erosion of natural deposits;
    runoff and leaching from fertilizer use

    mg/L

    10

    10
    Tetrachloroethylene (PCE) Discharge from factories,
    dry cleaners and auto shop
    (metal degreaser)

    mg/L

    5

    0.06
    Total Organic Carbon
    (TOC)    		 Erosion of natural deposits

    µg/L

    TT

    none
    Trichloroethylene
    (TCE)    		 Discharge from metal degreasing sites and other factories

    µg/L

    5

    1.7
    Turbidity (d) Soil runoff

    NTU

     TT = 1

    none

    %

    TT = 95% of
    samples ≤0.3 NTU
    Uranium (c) Erosion of natural deposits

    pCi/L

    20

    0.4

     

    Calendar Year 2022 Water Quality Monitoring Results

    Table I (A) – Health-based Primary Drinking Water Standards (MCLs)
    Substances Detected in Treated Water

    SAN FERNANDO VALLEY AREA

    Substances

    Units

    Meets
    Primary
    Standard
    (YES/NO)

    Los Angeles
    Aqueduct
    Filtration Plant

    Northern
    Combined Wells

    MWD
    Jensen Plant
     

    Average

    Range

    Average

    Range 

    Average

    Range 
    Aluminum

    µg/L

    YES

    <50

    <50

    <50

    <50

    62 (a)

    <50 – 81
    Arsenic

    µg/L

    YES

    3.1

    <2 – 6.9

    <2

    <2 - 3

    2.4

    2.4
    Barium

    µg/L

    YES

    <100

    <100

    <100

    <100

    <100

    <100
    Bromate (b)

    µg/L

    YES

    4.6 (a)

    4.2 – 5.0

    4.6 (b)

    <1 – 8

    7.2 (a)

    <1 – 15
    Fluoride

    mg/L

    YES

    0.8

    0.8

    0.7

    0.3 – 0.8

    0.7

    0.4 – 0.8
    Gross Alpha
    Particle
    Activity (c)

    pCi/L

    YES

    8

    8

    8

    3 - 8

    <3

    <3
    Gross Beta 
    Particle 
    Activity (c)

    CFU/mL

    YES

    <4

    <4

    <4

    <4 

    <4

    <4 - 5
    Heterotrophic Plate
    Count Bacteria

     µg/L

     YES

     <1

     <1

    <1

    <1

     <1

    <1 
    Nitrate (as N)

    mg/L

     YES

    0.7

    0.6 - 0.9 

    2.6

    0.4 – 4.3

     0.9

    0.9
    Nitrate + Nitrite
    (as N)

    mg/L

    YES

    0.7

    0.6 - 0.9

    0.7

    0.6 – 4.3

    NA

    NA
    Tetrachloroethylene (PCE)

    mg/L

     YES

    <0.5

    <0.5 

    <0.5

    <0.5 – 0.8

     <0.5

    <0.5
    Total Organic Carbon
    (TOC)

    µg/L

    YES

    0.8

    <0.3 – 1.3

    0.9

    <0.3 – 1.4

    1.5 (a)

    1.0 – 1.4
    Trichloroethylene
    (TCE)

    µg/L

    YES

    <0.5

    <0.5

    <0.5

    <0.5 - 3.4

    <0.5

    <0.5
    Turbidity (d)

    NTU

    YES
    0.6
    99.8

    NA

    NA

    NA

    NA

    NA

    %
    Uranium (d)

    pCi/L

    YES

    4

    3.8– 4.2

    6.2

    3 – 6.7

    <1

    <1 - 3

     

    Calendar Year 2022 Water Quality Monitoring Results

    Table I (A)  – Health-based Primary Drinking Water Standards (MCLs)
    Substances Detected in Treated Water

    WESTERN LOS ANGELES AREA

    Substances

    Units

    Meet
    Primary
    Standard
    (YES/NO)

    Los Angeles Aqueduct
    Filtration Plant
     

    Average

    Range
    Aluminum

    µg/L

    YES

    <50

    <50
    Arsenic

    µg/L

    YES

    3.1

    <2 – 6.9
    Barium

    µg/L

    YES

    <100

    <100
    Bromate (b)

    µg/L

    YES

    4.6 (a)

    4.2 – 5.0
    Fluoride

    mg/L

    YES

    0.8

    00.8
    Gross Alpha
    Particle
    Activity (c)

    pCi/L

    YES

    8

    8
    Gross Beta 
    Particle 
    Activity (c)

    CFU/mL

    YES

    <4

    <4
    Heterotrophic Plate
    Count Bacteria

      µg/L

    YES 

     <1

     <1
    Nitrate (as N)

    mg/L

    YES

    0.7

    0.6 - 0.9
    Nitrate + Nitrite
    (as N)

    mg/L

    YES

    0.7

    0.6 - 0.9
    Tetrachloroethylene (PCE)

    mg/L

    YES

    <0.5

    <0.5
    Total Organic Carbon
    (TOC)

    µg/L

    YES

    0.8

    <0.3 – 1.3
    Trichloroethylene
    (TCE)

    µg/L

    YES

    <0.5

    <0.5
    Turbidity (c)

    NTU

    YES
    0.6

    NA

    %

    99.8
    Uranium (d)

    pCi/L

    YES

    4

    3.8 – 4.2

     

    Calendar Year 2022 Water Quality Monitoring Results

    Table I (A)  – Health-based Primary Drinking Water Standards (MCLs)
    Substances Detected in Treated Water

    CENTRAL LOS ANGELES AREA

    Substances

    Units

    Meet
    Primary
    Standard
    (YES/NO)

    Los Angeles
    Aqueduct
    Filtration Plant

    Southern
    Combined Wells

     

    Average

    Range

    Average

    Range 
    Aluminum

    µg/L

    YES

    <50

    <50

    <50

    <50
    Arsenic

    µg/L

    YES

    3.1

    <2 – 6.9

    <2

    <2
    Barium

    µg/L

    YES

    <100

    <100

    <100

    <100 - 100
    Bromate (b)

    µg/L

    YES

    4.6 (a)

    4.2 – 5.0

    4.6 (b)

    <1 – 6
    Fluoride

    mg/L

    YES

    0.8

    0.8

    0.7

    0.7 – 0.9
    Gross Alpha
    Particle
    Activity (c)

    pCi/L

    YES

    8

    8

    7.6

    <3 - 8
    Gross Beta 
    Particle 
    Activity (c)

    CFU/mL

    YES

    <4

    <4

    <4

    <4
    Heterotrophic Plate
    Count Bacteria

      µg/L

     YES

     <1

     <1

    <1

    <1
    Nitrate (as N)

    mg/L

    YES

    0.7

    0.6 - 0.9

    0.7

    0.6 - 2.8
    Nitrate + Nitrite
    (as N)

    mg/L

    YES

    0.7

    0.6 - 0.9

    0.7

    0.6 – 2.9
    Tetrachloroethylene (PCE)

    mg/L

    YES

    <0.5

    <0.5

    <0.5

    <0.5 - 0.7
    Total Organic Carbon
    (TOC)

     µg/L

    YES

    0.8

    <0.3 – 1.3

    0.9

    0.3 – 1.8
    Trichloroethylene
    (TCE)

    µg/L

    YES

    <0.5

    <0.5

    <0.5

    <0.5
    Turbidity (c)

    NTU

    YES
    0.6
    99.8

    NA

    NA

    NA

    %
    Uranium (d)

    pCi/L

    YES

    4

    3.8 – 4.2

    6.2

    4.5 – 10

     

     
    Calendar Year 2022 Water Quality Monitoring Results

    Table I (A)  – Health-based Primary Drinking Water Standards (MCLs)
    Substances Detected in Treated Water

    EASTERN LOS ANGELES AND HARBOR AREAS

    Substances

    Units

    Meet
    Primary
    Standard
    (YES/NO)

    MWD
    Weymouth Plant

    MWD
    Diemer Plant

    MWD
    Jensen Plant 

     

    Average

    Range

    Average

    Range 

    Average

    Range 
    Aluminum

    µg/L

    YES

    156(a)

    <58 – 240

    140 (a)

    85 – 210

    62 (a)

    <50 – 81
    Arsenic

    µg/L

    YES

    <2

    <2

    <2

    <2

    2.4

    2.4
    Barium

    µg/L

    YES

    107

    107

    107

    107

    <100

    <100
    Bromate (b)

    µg/L

    YES

    <1 (a)

    <1 – 7.6

    <1 (a)

    <1

    7.2 (a)

    <1 – 15
    Fluoride

    mg/L

    YES

    0.7

    0.6 – 0.8

    0.7

    0.7 – 0.8

    0.7

    0.4 – 0.8
    Gross Alpha
    Particle
    Activity (c)

    pCi/L

    YES

    <3

    <3

    <3

    <3 - 3

    <3

    <3
    Gross Beta 
    Particle 
    Activity (c)

    CFU/mL

    YES

    6

    4 - 7

    6

    <4 - 9

    <4

    <4 - 5
    Heterotrophic Plate
    Count Bacteria

    µg/L 

    YES

    <1

    <1

    <1

    <1 - 1

    <1

    <1
     Nitrate (as N)

    mg/L 

     YES

     0.4

     0.4

    0.4

    0.4

    0.9

    0.9
    Nitrate + Nitrite
    (as N)

    mg/L

    YES

    NA

    NA

    NA

    NA

    NA

    NA
    Tetrachloroethylene (PCE)

    mg/L 

     YES

     <0.5

     <0.5

    <0.5

    < 0.5

    <0.5

     <0.5
    Total Organic Carbon
    (TOC)

    µg/L

    YES

    2.4(a)

    1.7 – 2.6

    2.5(a)

    2.3 – 2.6

    1.5(a)

    1.0 – 1.4
    Trichloroethylene
    (TCE)

    µg/L

    YES

    <0.5

    <0.5

    <0.5

    <0.5

    <0.5

    <0.5
    Turbidity (c)

    NTU

    YES

    NA

    NA

    NA

    NA

    NA

    NA

    %
    Uranium (d)

    pCi/L

    YES

    2

    1 - 3

    2

    1 - 3

    <1

    <1 – 3

     

    (a) Values reflect Highest Running Annual Average (HRAA). HRAA is the highest of all Running Annual Averages (RAAs) in the reported calendar year. RAA is a calculated average of all samples collected within the previous 12-month period, which may include test data from the previous calendar year. HRAA may be higher than the range, which is based on the test data in the reported calendar year.
    (b) Bromate is formed in water treated with ozone in the presence of bromide. Bromate has also been found in water treated with chlorine in some uncovered reservoirs in LADWP that have elevated bromide levels and are exposed to sunlight. MWD tests for bromate at its Diemer and Jensen Filtration Plants, which use ozone. All LADWP distribution reservoirs are now shielded with flexible covers or shade balls to minimize bromate formation. 
    (c) Radiological monitoring is performed in LADWP for treated sources water and at the blend points.
    (d) Turbidity is a measure of the cloudiness of water and is a good indicator of water quality and filtration performance. High turbidity can hinder the effectiveness of disinfectants. The Primary Drinking Water Standard for turbidity (included in this table) at water filtration plants is less than or equal to 0.3 NTU in at least 95 percent of the measurements taken in any month and shall not exceed 1.0 NTU at any time. The reporting requirement for treatment plant turbidity is to report the highest single measurement in the calendar year as well as the lowest monthly percentage of measurements that are less than or equal to 0.3 NTU. 
    Table I (B)
    Calendar Year 2022 Water Quality Monitoring Results

    Table I (B) – Health-based Primary Drinking Water 
    Standards (MCLs) Substances Detected in Treated Water

    Reported on City-Wide Basis

    Substances

    Units

    Meet Primary Standard
    (YES/NO)

    Average

    Range
    Bromate
    (uncovered reservoirs)

    µg/L

    YES

    HRAA = 4.9 (a)

    Range = 4.3 - 5.4
    Chlorine Residual, Total

    mg/L

    YES

    HRAA = 1.9 (a)

    Range = 1.7 – 2.3
    Copper (at-the-tap)  
    AL = 1300  (e)

    µg/L

    YES

    90th Percentile value = 394

    Number of samples
    exceeding AL = 0 out of 100
    Fluoride

    mg/L

    YES

    Average = 0.7

    Range = 0.7 – 0.8
    Haloacetic Acids (Five)  (HAA5)

    µg/L

    YES

    HLRAA = 10.8 (f)

    Range = 3 – 13
    Lead (at-the-tap)  
    AL = 15  (e)

    µg/L

    YES

    90th Percentile value = 5.0

    Number of samples
    exceeding AL = 1 out of 100
    Total Coliform Bacteria

    % Positives

    YES

    Highest monthly % 
    positive samples = 0.9%

    Range of monthly positive
    samples = 0% – 0.9%
    Total Trihalomethanes  (TTHM)

    µg/L

    YES

    HLRAA = 38 (f)

    Range = 15 – 48

     

    Calendar Year 2022 Water Quality Monitoring Results

    Table I (B) (con't) – Health-based Primary Drinking Water Standards; MCLs, PHGs, and Major Sources of Substances Detected in Drinking Water

    Reported on City-Wide Basis

    Substances

    Major Sources in Our Drinking Water

    Units

    State Primary
    Standard MCL
    or (MRDL)

    State PHG / 
    [MRDLG]
    Bromate 
    (uncovered reservoirs)    		 Byproduct of ozone disinfection;
    formed under sunlight for chlorinated water

    µg/L

    10

    0.1
    Chlorine Residual, Total Drinking water disinfectant added for treatment

    mg/L

    (4)

    (4)
    Copper (at-the-tap)
    AL = 1300  (e)    		 Internal corrosion of household water plumbing systems

    µg/L

    TT

    300
    Fluoride Erosion of natural deposits; 
    water additive that promotes strong teeth

    mg/L

    2

    1
    Haloacetic Acids (Five)
    (HAA5)    		 Byproduct of drinking water disinfection

    µg/L

    60

    none
    Lead (at-the-tap)
    AL = 15  (e)    		 Internal corrosion of household water plumbing systems

    µg/L

    TT

    0.2
    Total Coliform Bacteria Naturally present in the environment

    % Positives

    ≤5% of monthly
    samples are
    coliform positive

    0
    Total Trihalomethanes (TTHM) Byproduct of drinking water chlorination

    µg/L

    80

    none

     

    (a) Values reflect Highest Running Annual Average (HRAA). HRAA is the highest of all Running Annual Averages (RAAs) in the reported calendar year. RAA is a calculated average of all samples collected within the previous 12-month period, which may include test data from the previous calendar year. HRAA may be higher than the range, which is based on the test data in the reported calendar year.
     
    (e) At-the-tap monitoring of lead and copper is conducted as required by the federal Lead and Copper Rule. A system is out of compliance if the federal Action Level is exceeded in more than 10 percent of all samples collected at the customers’ tap. The most recent monitoring was conducted in 2020. Although the City’s treated water has little or no detectable lead, studies were conducted. A corrosion control study was completed in 2019 which found that LADWP’s corrosion control treatment is optimized and that it does not require the continued addition of a corrosion inhibitor.
    (f) The federal Stage 2 Disinfectants/Disinfection Byproducts Rule (Stage 2 DBPR) requires compliance monitoring and reporting for total trihalomethanes (TTHM) and five haloacetic acids (HAA5) based on Locational Running Annual Averages (LRAAs) of established monitoring locations. The Highest Locational Running Annual Averages (HLRAAs) of all LRAAs in the current calendar year for TTHM and HAA5 are reported.
    Table II
    Calendar Year 2022 Water Quality Monitoring Results

    Table II – Aesthetic-based Secondary Drinking Water Standards (SMCLs)
    Substances Detected in Treated Water

    SAN FERNANDO VALLEY AREA

    Substances

    Units

    Meet
    Primary
    Standard
    (YES / NO)

    Los Angeles
    Aqueduct
    Filtration Plant

    Northern
    Combined Wells

    MWD
    Jensen Plant 
         

    Average

    Range

    Average

    Range 

    Average

    Range
    Aluminum

    µg/L

    YES

    <50

    <50

    <50

    <50

    62 (a)

    <50 – 81
    Chloride

    mg/L

    YES

    64

    60 –  69

    56

    44 – 67

    70

    67 – 73
    Color, Apparent
    (unfiltered)

    ACU

    YES

    3

    3

    <3

    <3 – 3

    <3

    <3
    Copper

    µg/L

    YES

    <50

    <50 - 50

    <50

    <50

    <50

    <50
    Manganese

    µg/L

    NO

     <20

    <20 

    <20 

    <20 

     <20

    <20 
    Odor

    TON

    YES

    <1

    <1

    <1

    <1

    3

    3
    pH

    UNIT

    YES

     7.7

     6.8 – 8.5

     7.8

    7.0 –  8.6

     8.3

    8.2 - 8.3 
    Specific Conductance

    µS/cm at 25°C

    NO

    490

    337 – 659

    728

    180 – 1773

    564

    557 – 572
    Sulfate (as SO4)

    mg/L

    YES

    64

    55 – 70

    173

    65 – 173

    76

    71 – 80
    Total Dissolved
    Solids (TDS)

    mg/L

    YES

    300

    280 – 319

    462

    300 – 523

    334

    332 – 335
    Turbidity (g)

    NTU

    YES

    <0.1

    <0.1

    0.1

    <0.1 – 0.2

    <0.1

    <0.1


     

    Calendar Year 2022 Water Quality Monitoring Results

    Table II – Aesthetic-based Secondary Drinking Water Standards (SMCLs)
    Substances Detected in Treated Water

    WESTERN LOS ANGELES AREA

    Substances

    Units

    Meet
    Primary
    Standard
    (YES / NO)

    Los Angeles
    Aqueduct
    Filtration Plant
         

    Average

    Range
    Aluminum

    µg/L

    YES

    <50

    <50
    Chloride

    mg/L

    YES

    64

    60 –  69
    Color, Apparent
    (unfiltered)

    ACU

    YES

    3

    3
    Copper

    µg/L

    YES

    <50

    <50 - 50
    Manganese

    µg/L

    NO

    <20

    <20
    Odor

    TON

    YES

    <1

    <1
    pH

    UNIT

    YES

     7.7

    6.8 – 8.5
    Specific Conductance

    µS/cm at
    25°C

    NO

    490

    337 – 659
    Sulfate (as SO4)

    mg/L

    YES

    64

    55 – 70
    Total Dissolved
    Solids (TDS)

    mg/L

    YES

    300

    280 – 319
    Turbidity (g)

    NTU

    YES

    <0.1

    <0.1


     

    Calendar Year 2022 Water Quality Monitoring Results

    Table II – Aesthetic-based Secondary Drinking Water Standards (SMCLs)
    Substances Detected in Treated Water

    CENTRAL LOS ANGELES AREA

    Substances

    Units

    Meet
    Primary
    Standard
    (YES / NO)

    Los Angeles
    Aqueduct
    Filtration Plant

    Southern
    Combined Wells
         

    Average

    Range

    Average

    Range 
    Aluminum

    µg/L

    YES

    <50

    <50

    <50

    <50
    Chloride

    mg/L

    YES

    64

    60 –  69

    56

    49 – 82
    Color, Apparent
    (unfiltered)

    ACU

    YES

    3

    3

    <3

    <3 – 3
    Copper

    µg/L

    YES

    <50

    <50 - 50

    <50

    <50
    Manganese

    µg/L

    NO

     <20

    <20 

    <20 

    <20 - 338 (h) 
    Odor

    TON

    YES

    <1

    <1

    <1

    <1
    pH

    UNIT

    YES

     7.7

    6.8 – 8.5

     7.8

    7.1 –  8.6
    Specific Conductance

    µS/cm at
    25°C

    NO

    490

    337 – 659

    728

    180 – 1773
    Sulfate (as SO4)

    mg/L

    YES

    64

    55 – 70

    173

    93 – 218
    Total Dissolved
    Solids (TDS)

    mg/L

    YES

    300

    280 – 319

    462

    393 – 597
    Turbidity (g)

    NTU

    YES

    <0.1

    <0.1

    0.1

    <0.1 – 0.3

     

    Calendar Year 2022 Water Quality Monitoring Results

    Table II – Aesthetic-based Secondary Drinking Water Standards (SMCLs)
    Substances Detected in Treated Water

    EASTERN LOS ANGELES AND HARBOR AREA

    Substances

    Units

    Meet
    Primary
    Standard
    (YES / NO)

    MWD
    Weymouth Plant

    MWD
    Diemer Plant

    MWD
    Jensen Plant
         

    Average

    Range

    Average

    Range 

    Average

    Range
    Aluminum

    µg/L

    YES

    156 (a)

    56 – 240

    140 (a)

    8 – 210

    62 (a)

    <50 – 81
    Chloride

    mg/L

    YES

    102

    98 - 105

    101

    98 – 104

    70

    67 – 73
    Color, Apparent
    (unfiltered)

    ACU

    YES

    <3

    <3

    <3

    <3

    <3

    <3
    Copper

    µg/L

    YES

    <50

    <50

    <50

    <50

    <50

    <50
    Manganese

    µg/L

    NO

    <20 

    <20 

    <20 

    <20 

    <20 

    <20 
    Odor

    TON

    YES

    3

    3

    3

    3

    3

    3
    pH

    UNIT

    YES

     8.1

     8.1

     8.1

    8.1

     8.3

    8.2 - 8.3
    Specific Conductance

    µS/cm at
    25°C

    NO

    992

    964 – 1020

    988

    965 – 1010

    564

    557 – 572
    Sulfate (as SO4)

    mg/L

    YES

    222

    212 - 232

    221

    213 - 229

    76

    71 – 80
    Total Dissolved
    Solids (TDS)

    mg/L

    YES

    638

    632 – 643

    628

    608 – 648

    334

    332 – 335
    Turbidity (g)

    NTU

    YES

    <0.1

    <0.1

    <0.1

    <0.1

    <0.1

    <0.1

     

    (a) Values reflect Highest Running Annual Average (HRAA). HRAA is the highest of all Running Annual Averages (RAAs) in the reported calendar year. RAA is a calculated average of all samples collected within the previous 12-month period, which may include test data from the previous calendar year. Hence, HRAA may be higher than the range, which is based on the test data in the reported calendar year.
     
    (g) The Secondary Maximum Contaminant Level for turbidity of treated water in the distribution system is 5 NTU at the entry points to the distribution system.
     
    (h) In October, 2022 manganese at the Manhattan Well Field exceeded the secondary maximum contaminant level (SMCL) of 50 µg/L (ppb). The exceedance was most likely due to an outlier sample that is not representative based on other water quality parameters associated with the same sample. It’s important to note that secondary standards regulate the color and taste of drinking water and are not normally considered to be a health concern. Prolonged exposure to manganese, however, can have potential health impacts including neurotoxicity. LADWP has halted water deliveries from this well field until additional measures are in place to remove the manganese.
     
    Calendar Year 2022 Water Quality Monitoring Results

    Table II (cont'd) – Aesthetic-based Secondary Drinking Water Standards
    (SMCLs) and Major Sources of Substances in Drinking Water

    Substances

    Major Sources in Our Drinking Water

    Units

    State SMCL or
    Federal (SMCL)
    Aluminum Erosion of natural deposits; residue from some surface water treatment processes

    µg/L

    (200)
    Chloride Runoff / leaching from natural deposits; seawater influence

    mg/L

    (500)
    Color, Apparent
    (unfiltered)    		 Naturally-occurring organic materials

    ACU

    (15)
    Copper Internal corrosion of household water plumbing systems

    µg/L

    (1000)
    Manganese Leaching from natural deposit

    µg/L

    (50)
    Odor Naturally-occurring organic materials

    TON

    (3)
    pH Naturally-occurring dissolved gases and minerals

    Unit

    (6.5 – 8.5)
    Specific Conductance Substances that form ions when in water; seawater influence

    µS/cm at
    25°C

    (1600)
    Sulfate (as SO4) Runoff / leaching from natural deposits

    mg/L

    (500)
    Total Dissolved
    Solids (TDS)    		 Runoff / leaching from natural deposits

    mg/L

    (1000)
    Turbidity (g) Soil runoff

    NTU

    (5)
    Table III
    Calendar Year 2022 Water Quality Monitoring Results

    Table III – Unregulated Drinking Water Substances Detected in Treated Water

    SAN FERNANDO VALLEY AREA

    Substances

    Units

    Los Angeles
    Aqueduct
    Filtration Plant

    Northern
    Combined Wells

    MWD
    Jensen Plant 

     

     

    Average

    Range

    Average

    Range

    Average

    Range
    Alkalinity, Total 
      (as CaCO3)

    mg/L

    85

    79 – 89

    124

    81 – 188

    84

    84
    Ammonia + Chloramines (as N)

    mg/L

    0.4

    0.3 - 0.5

    <0.05

    <0.05 – 1

    NA

    NA
    Bicarbonate Alkalinity (as HCO3)

    mg/L

    104

    96 – 109

    151

    99 – 229

    NA

    NA
    Boron     NL = 1000

    µg/L

    237

    182 – 279

    219

    149 – 272

    220

    220
    Bromide

    mg/L

    0.2

    0.1 – 0.2

    0.1

    0.04 – 0.2

    NA

    NA
    Calcium

    mg/L

    30

    26 – 32

    65

    31 – 79

    33

    32 – 34
    Chlorate NL=800

    µg/L

    NT

    NT

    <20

    <20 - 34

    243

    243
    Chromium, Hexavalent

    µg/L

    <1

    <1

     <1

    <1 – 3.2 

     <1

    <1
    Corrosivity

     

    12

    11 - 13

    12

    11 - 13

    12

    12
    Hardness, Total 
     (as CaCO3)

    mg/L

    103

    93 – 107

    230

    105 – 275

    108

    107 – 110
    Lithium

    µg/L

    32

    14 – 41

     NA

    NA

    NA

    NA
    Magnesium

    mg/L

    7

    6 – 7

    16

    6 – 19

    6.8

    6.2 – 7.5
    Phosphate (as PO4)

    mg/L

    0.1

    0.1

    0.1

    0.1

    NA

    NA
    Potassium

    mg/L

    2.4

    1.9 - 2.7

    3.3

    2 – 5.2

    2

    2
    Radium 228

    pCi/L

    <1

    <1

    <1

    <1

    <1

    <1
    Silica (as SiO2)

    mg/L

    16

    15 - 17

    21

    15 – 25

    NA

    NA
    Sodium

    mg/L

    61

    54 – 64

    58

    43 – 62

    72

    71 – 72
    Temperature

    ºC

    17

    8 – 28

    20

    10– 30

    NA

    NA
    Total Coliform

    MPN/
    100 mL

    <1

    <1 - 140

    <1

    <1 – 7.5

    <1

    <1
    Vanadium     NL = 50

    µg/L

    <3

    <3

    <3

    <3 - 7.1

    6.2

    6.2

     

    Calendar Year 2022 Water Quality Monitoring Results

    Table III – Unregulated Drinking Water Substances Detected in Treated Water

    WESTERN LOS ANGELES AREA

    Substances

    Units

    Los Angeles
    Aqueduct Filtration Plant
     

     

     

    Average

    Range
    Alkalinity, Total 
      (as CaCO3)

    mg/L

    85

    79 – 89
    Ammonia + Chloramines (as N)

    mg/L

    0.4

    0.3 - 0.5
    Bicarbonate Alkalinity (as HCO3)

    mg/L

    104

    96 – 109
    Boron     NL = 1000

    µg/L

    237

    182 – 279
    Bromide

    mg/L

    0.2

    0.1 – 0.2
    Calcium

    mg/L

    30

    26 – 32
    Chlorate NL=800

    µg/L

    NT

    NT
    Chromium, Hexavalent

    µg/L

    <1

    <1
    Corrosivity

     

    12

    11 - 13
    Hardness, Total 
     (as CaCO3)

    mg/L

    103

    93 – 107
    Lithium

    µg/L

    32

    14 – 41
    Magnesium

    mg/L

    7

    6 – 7
    Phosphate (as PO4)

    mg/L

    0.1

    0.1
    Potassium

    mg/L

    2.4

    1.9 - 2.7
    Radium 228

    pCi/L

    <1

    <1
    Silica (as SiO2)

    mg/L

    16

    15 – 17
    Sodium

    mg/L

    61

    54 – 64
    Temperature

    ºC

    17

    8 – 28
    Total Coliform

    MPN/
    100 mL

    <1

    <1 - 140
    Vanadium NL = 50

    µg/L

    <3

    <3

     

    Calendar Year 2022 Water Quality Monitoring Results

    Table III – Unregulated Drinking Water Substances Detected in Treated Water

    CENTRAL LOS ANGELES AREA

    Substances

    Units

    Los Angeles
    Aqueduct
    Filtration Plant

    Southern
    Combined Wells

     

     

    Average

    Range

    Average

    Range
    Alkalinity, Total 
      (as CaCO3)

    mg/L

    85

    79 – 89

    124

    100 – 184
    Ammonia + Chloramines (as N)

    mg/L

    0.4

    0.3 - 0.5

    0.4

    0.2 – 0.5
    Bicarbonate Alkalinity (as HCO3)

    mg/L

    104

    96 – 109

    151

    122 – 225
    Boron     NL = 1000

    µg/L

    237

    182 – 279

    219

    118 – 272
    Bromide

    mg/L

    0.2

    0.1 – 0.2

    0.1

    0.1 – 0.2
    Calcium

    mg/L

    30

    26 – 32

    65

    46 – 86
    Chlorate NL=800

    µg/L

    NT

    NT

    564

    37 - 1340
    Chromium, Hexavalent

    µg/L

    <1

    <1

     <1

    <1 – 1.3 
    Corrosivity

     

    12

    11 - 13

    13

    11 - 13
    Hardness, Total 
     (as CaCO3)

    mg/L

    103

    93 – 107

    230

    165 – 291
    Lithium

    µg/L

    32

    14 – 41

    NA

    NA
    Magnesium

    mg/L

    7

    6 – 7

    16

    12 – 24
    Phosphate (as PO4)

    mg/L

    0.1

    0.1

    0.1

    0.1 – 0.2
    Potassium

    mg/L

    2.4

    1.9 - 2.7

    3

    2.5 – 4.4
    Radium 228

    pCi/L

    <1

    <1

    <1

    <1
    Silica (as SiO2)

    mg/L

    16

    15 – 17

    21

    12 – 27
    Sodium

    mg/L

    61

    54 – 64

    58

    46 – 87
    Temperature

    ºC

    17

    8 – 28

    20

    11– 30
    Total Coliform

    MPN/
    100 mL

    <1

    <1 - 140

    <1

    <1
    Vanadium  NL = 50

    µg/L

    <3

    <3

    <3

    <3

     

    Calendar Year 2022 Water Quality Monitoring Results

    Table III – Unregulated Drinking Water Substances Detected in Treated Water

    EASTERN LOS ANGELES AND HARBOR AREAS

    Substances

    Units

    MWD
    Weymouth Plant

    MWD
    Diemer Plant

    MWD
    Jensen Plant 

     

     

    Average

    Range

    Average

    Range

    Average

    Range
    Alkalinity, Total 
      (as CaCO3)

    mg/L

    127

    126 – 128

    126

    125 – 127

    84

    84
    Ammonia + Chloramines (as N)

    mg/L

    NA

    NA

    NA

    NA

    NA

    NA
    Bicarbonate Alkalinity (as HCO3)

    mg/L

    NA

    NA

    NA

    NA

    NA

    NA
    Boron     NL = 1000

    µg/L

    140

    140

    130

    130

    220

    220
    Bromide

    mg/L

    NA

    NA

    NA

    NA

    NA

    NA
    Calcium

    mg/L

    70

    68 - 71

    68

    66 – 70

    33

    32 – 34
    Chlorate NL=800

    µg/L

    88

    88

    90

    90

    243

    243
    Chromium, Hexavalent

    µg/L

    <1

    <1

     <1

    <1

     <1

    <1
    Corrosivity

     

    13

    13

    12

    12 - 13

    12

    12
    Hardness, Total 
     (as CaCO3)

    mg/L

    279

    277 – 281

    278

    275 – 281

    108

    107 – 110
    Lithium

    µg/L

    NA

    NA

    NA

    NA

    NA

    NA
    Magnesium

    mg/L

    26

    25 – 26

    25

    24 – 26

    6.8

    6.2 – 7.5
    Phosphate (as PO4)

    mg/L

    NA

    NA

    NA

    NA

    NA

    NA
    Potassium

    mg/L

    4.6

    4.5 – 4.8

    4.6

    4.4 – 4.8

    2

    2
    Radium 228

    pCi/L

    <1 - 1

    <1

    <1

    <1

    <1

    <1
    Silica (as SiO2)

    mg/L

    NA

    NA

    NA

    NA

    NA

    NA
    Sodium

    mg/L

    100

    98 – 103

    98

    93 – 102

    72

    71 – 72
    Temperature

    ºC

    NA

    NA

    NA

    NA

    NA

    NA
    Total Coliform

    MPN/
    100 mL

    <1

    <1

    <1

    <1

    <1

    <1
    Vanadium  NL = 50

    µg/L

    <3

    <3

    <3

    <3

    6.2

    6.2

     

    Calendar Year 2022 Water Quality Monitoring Results

    Table III (con't) – Major Sources of Unregulated Drinking Water 
    Substances in Drinking Water

    Substances

    Major Sources in Our Drinking Water

    Units
    Alkalinity, Total (as CaCO3) Erosion of natural deposits

    mg/L
    Ammonia + Chloramines (as N) Drinking water disinfectant added for treatment

    mg/L
    Bicarbonate (as CaCO3) Naturally-occurring dissolved gas; erosion of natural deposits

    mg/L
    Boron     NL = 1000 Erosion of natural deposits

    µg/L
    Bromide Runoff / leaching from natural deposits; seawater influence

    µg/L
    Calcium Erosion of natural deposits; natural hot springs

    mg/L
    Chlorate NL=800 Byproducts of drinking water chlorination; industrial process

    µg/L
    Chromium, Hexavalent Industrial discharge; erosion of natural deposits

    µg/L
    Corrosivity Measure of the balance between pH and calcium carbonate saturation in the water

     
    Hardness, Total (as CaCO3) Erosion of natural deposits

    mg/L
    Lithium Erosion of natural deposits

    µg/L
    Magnesium Erosion of natural deposits

    mg/L
    Phosphate (as PO4) Erosion of natural deposits, agricultural run-off

    µg/L
    Potassium Erosion of natural deposits

    mg/L
    Radium 228 Erosion of natural deposits

    pCi/L
    Silica (as SiO2) Erosion of natural deposits

    mg/L
    Sodium Erosion of natural deposits

    mg/L
    Temperature Natural seasonal fluctuation

    ºC
    Total Coliform Naturally present in the environment

    MPN/
    100 mL
    Vanadium  NL = 50 Erosion of natural deposits

    µg/L
    Table IV

    The Unregulated Contaminant Monitoring Rule (UCMR) is a special program developed by the U.S. EPA that requires public water systems to monitor up to 30 selected contaminants of emerging concerns (CECs) once every five years.

    During the fourth UCMR (UCMR4), LADWP monitored 29 unregulated contaminants. The contaminants monitored were total microcystins, microcystin-LA, microcystin-LF, microcystin-L, microcystin-LY, microcystin-RR, microcystin-YR, nodularin, anatoxin-a, cylindrospermopsin, germanium, manganese, alphahexachlorocyclohexane, chlorpyrifos, dimethipin, ethoprop, profenofos, tebuconazole, total permethrin (cis- & trans-), tribufos, oxyfluorfen, HAA5, HAA6Br, HAA9,1-butanol, 2-methoxyethanol, 2-propen-1-ol, butylated hydroxyanisole, o-toluidine and quinolone.

    Most of the contaminants were not detected. Table IV below provides the contaminants that were detected during UCMR4. Contaminants that were detected were lower than the MCLs. Algal bloom and cyanotoxin were monitored at the source locations for each sampling event, and were not detected.

    Water Quality Monitoring Results from 2018 and 2019

    Table IV – The Fourth US EPA Unregulated Contaminant Monitoring Rule (UCMR4)
    Substances Detected in Treated Water

    SAN FERNANDO VALLEY AREA

    Substances

    Units

    Meets
    MCL 
    or NL
    (YES/NO)

    State
    Primary
    Standard
    MCL or (NL)

    State
    PHG or
    Federal
    (MCLG)

    Los Angeles
    Aqueduct
    Filtration Plant

    Northern
    Combined
    Wells
     

     

     

     

     

    Average

    Range

    Average

    Range 
    Bromide

    mg/L

    NA

    NA

    NA

    0.06

    0.04 - 0.09

    0.07

    0.03 – 0.11
    HAA5  

    µg/L

    YES

    60

    NA

    3.3 (I)

    1.9 - 4.4 (I)

    3.3 (I)

    1.9 - 4.4 (I)
    HAABr6

    µg/L

    NA

    NA

    NA

    2.1 (i)

    1.0 – 3.7 (I)

    2.1 (I)

    1.0 – 3.7 (I)
    HAA9

    µg/L

    NA

    NA

    NA

    1.5 (i)

    0.8 - 2.9 (i)

    1.5 (i)

    0.8 - 2.9 (i)
    Manganese

    µg/L

    YES

    (50)

    NA

    <0.4

    <0.4 - 0.45

    0.76

    0.55 -0.87
    Total Organic Carbon (TOC)

    mg/L

    NA

    NA

    NA

    1.6

    1.5 - 1.7

    1.3

    1.1 - 1.6

     

    Water Quality Monitoring Results from 2018 and 2019

    Table IV  – The Fourth US EPA Unregulated Contaminant Monitoring Rule (UCMR4)
    Substances Detected in Treated Water

    WESTERN LOS ANGELES AREA

    Substances

    Units

    Meets
    MCL 
    or NL
    (YES/NO)

    State
    Primary
    Standard
    MCL or (NL)

    State
    PHG or
    Federal
    (MCLG)

    Los Angeles
    Aqueduct
    Filtration Plant
             

    Average

    Range
    Bromide

    mg/L

    NA

    NA

    NA

    0.06

    0.04 - 0.09
    HAA5

    µg/L

    YES

    60

    NA

    3.3 (i)

    1.9 - 4.4 (i)
    HAABr6

    µg/L

    NA

    NA

    NA

    2.1 (I)

    1.0 - 3.7 (I)
    HAA9

    µg/L

    NA

    NA

    NA

    1.5 (i)

    0.8 – 2.9 (i)
    Manganese

    µg/L

    YES

    (50)

    NA

    <0.4

    <0.4 - 0.45
    Total Organic Carbon (TOC)

    mg/L

    NA

    NA

    NA

    1.6

    1.5 - 1.7

     

    Water Quality Monitoring Results from 2018 and 2019

    Table IV – The Fourth US EPA Unregulated Contaminant Monitoring Rule (UCMR4)
    Substances Detected in Treated Water

    CENTRAL LOS ANGELES AREA

    Substances

    Units

    Meets
    MCL 
    or NL
    (YES/NO)

    State
    Primary
    Standard
    MCL or (NL)

    State
    PHG or
    Federal
    (MCLG)

    Los Angeles
    Aqueduct
    Filtration Plant

    Southern
    Combined
    Wells
     

     

     

     

     

    Average

    Range

    Average

    Range 
    Bromide

    mg/L

    NA

    NA

    NA

    0.06

    0.04 - 0.09

    0.07

    0.03 – 0.2
    HAA5

    µg/L

    YES

    60

    NA

    3.3 (i)

    1.9 - 4.4 (i)

    3.6 (i)

    2.7  – 5.0 (i)
    HAABr6

    µg/L

    NA

    NA

    NA

    2.1 (i)

    1.0 - 3.7 (i)

    2.7 (i)

    2.2 – 3.8 (i)
    HAA9

    µg/L

    NA

    NA

    NA

    1.5 (i)

    0.8 – 2.9 (i)

    1.6 (i)

    1.1 – 2.4 (i)
    Manganese

    µg/L

    YES

    (50)

    NA

    <0.4

    <0.4 - 0.45

    0.76

    0.70 - 0.82
    Total Organic Carbon (TOC)

    mg/L

    NA

    NA

    NA

    1.6

    1.5 - 1.7

    1.3

    0.3 - 2.2

     

    Water Quality Monitoring Results from 2018 and 2019

    Table IV – The Fourth US EPA Unregulated Contaminant Monitoring Rule (UCMR4)
    Substances Detected in Treated Water

    HARBOR/EASTERN LOS ANGELES AREA

    Substances

    Units

    Meets
    MCL 
    or NL
    (YES/NO)

    State
    Primary
    Standard
    MCL or (NL)

    State
    PHG or
    Federal
    (MCLG)

    Distribution System
    Sampling Locations
             

    Average

    Range
    Bromide

    mg/L

    NA

    NA

    NA

    NA

    NA
    HAA5

    µg/L

    YES

    60

    NA

    6.0 (i)

    5.3 - 7.0 (i)
    HAABr6

    µg/L

    NA

    NA

    NA

    3.7 (i)

    3.3 - 4.3 (i)
    HAA9

    µg/L

    NA

    NA

    NA

    3.3 (i)

    2.8 – 4.3 (i)
    Manganese

    µg/L

    YES

    (50)

    NA

    1.34

    0.60 - 1.86
    Total Organic Carbon (TOC)

    mg/L

    NA

    NA

    NA

    7

    4.4 - 12.8

     

    (i) For UCMR4 sampling, LADWP used the same established sampling locations as used for the Stage 2 Disinfectants/Disinfection By-Products Rule compliance monitoring. HAA5, HAA6Br and HAA9 were based on locational averages. These sample points are located throughout LADWP’s distribution system. Data has been grouped by geographical area for the HAA results.