Short answer: In the 2021–2025 records we hold for Los Angeles, no listed result is above a legal limit, but a health-based violation is on record (EPA SDWIS). Also worth knowing: lithium sits above a screening level, and the water is hard. 9 substances were detected and 29 were tested and not detected. The water is from Los Angeles Department of Water and Power, serving 3,875,566 residents.
EPA lists this system for the city. Your water bill or annual water quality report names your actual supplier. Source: EPA SDWIS 2026Q2.
Also supplies: Culver City, West Hollywood, View Park-Windsor Hills
Surface water
Treated and disinfected with chloramine.
Mains, then your building’s service line.
Plumbing inside the building is outside this record.
No measured result is above a legal limit; lithium sits above a screening level, and the water is hard.
100 µg/L, sampled 2023-12-26 to 2024-09-11. EPA UCMR 5.
10 µg/L EPA health reference level (screening, not a legal limit).
Detected at up to 100 µg/L (above the 10 µg/L EPA health reference level; a screening level, not a legal limit).
Where it enters is not in this record.
Test your own tap first. To reduce it: Depends on the contaminant (The certifier's listing for each named contaminant).
33.8 ppb, sampled 2025. Utility CCR.
80 ppb federal MCL: a legal limit.
33.8 ppb (below the 80 ppb federal limit).
Forms in the pipes as the disinfectant reacts with natural organic matter.
Test your own tap first. Technologies that can reduce it: Activated carbon, Reverse osmosis.
0.529 mg/L, sampled 2025. Utility CCR.
1.3 mg/L (action level). EPA health goal (MCLG): 1.3 mg/L.
Copper: measured 0.529 mg/L, within the 1.3 mg/L (action level) federal limit.
Usually from copper plumbing inside buildings, more where water sits in the pipes.
Test your own tap first. Technologies that can reduce it: Reverse osmosis, Corrosion-control / pH adjustment, Flushing standing water before use.
0.003 mg/L, sampled 2025. Utility CCR.
0.010 mg/L. EPA health goal (MCLG): 0.
Arsenic: measured 0.003 mg/L, within the 0.010 mg/L federal limit.
Comes with the source water, often from natural deposits in rock and soil.
Test your own tap first. Technologies that can reduce it: Reverse osmosis, Anion exchange, Activated alumina / adsorptive media.
3.9 µg/L, sampled 2021–2023 monitoring period. EPA SDWIS (Lead & Copper Rule).
15 µg/L federal action level. EPA health goal (MCLG): 0.
The 90th-percentile tap result was 3.9 µg/L (below the 15 µg/L action level).
Usually from lead service lines, solder and fixtures inside buildings, after the water leaves treatment.
Test your own tap first. To reduce it: Lead-certified carbon filter, or reverse osmosis (NSF/ANSI 53 (lead)).
13.4 ppb, sampled 2025. Utility CCR.
60 ppb federal MCL: a legal limit.
13.4 ppb (below the 60 ppb federal limit).
Forms in the pipes as the disinfectant reacts with natural organic matter.
Test your own tap first. Technologies that can reduce it: Activated carbon, Reverse osmosis.
0.7 mg/L, sampled 2025. Utility CCR.
4.0 mg/L. EPA health goal (MCLG): 4.0 mg/L.
Fluoride: measured 0.7 mg/L, within the 4.0 mg/L federal limit.
Where it enters is not in this record.
Test your own tap first. Technologies that can reduce it: Reverse osmosis, Activated alumina / adsorptive media, Distillation.
0.4 mg/L, sampled 2025. Utility CCR.
10 mg/L.
Nitrate: measured 0.4 mg/L, within the 10 mg/L federal limit.
Comes with the source water, often from fertilizer, manure or septic systems.
Test your own tap first. Technologies that can reduce it: Reverse osmosis, Anion exchange, Distillation.
8.2 gpg, sampled 2025. Utility CCR.
Aesthetic, no federal health limit.
140 mg/L as CaCO3 (8.2 grains/gal), hard. Aesthetic (scale/appliances), not a health finding.
Shows up as scale in kettles, water heaters and fixtures.
Test your own tap first. To reduce it: Ion-exchange water softener (NSF/ANSI 44 (softeners)).
LOS ANGELES-CITY, DEPT. OF WATER & POWER (EPA PWSID CA1910067) delivers surface water to 3,875,566 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. The utility's 2025 CCR reports hard water and chloramine disinfection.
1health-based violation in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score.
Every filing is listed; the Track record score counts at most one per contaminant per year.
Resolved
to Resolved
The record describes water leaving treatment and samples across the system. Pipes, solder and fixtures inside a building can add lead the record can’t see, especially in older buildings with lead service lines.
Test your waterMeasured in this report
Sampled across the system
Not in this record
Only a tap test measures it
Know what comes from your tap, starting with a first-draw lead sample.
Compare each result with its named reference in our test reader.
Choose a technology certified for what your test found.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Screening: quick check, not lab-grade
Varify
17 strip readings, including lead, chlorine, fluoride, iron and hardness, plus 2 coliform bacteria tests
What it can't tell you: Strip colors give rough ranges, not lab numbers, and it cannot detect PFAS or arsenic.
When your results arrive, read them here → · Compare every kit we list
| Finding | Reference type | Technology | Certification to check |
|---|---|---|---|
| Lithium100 µg/L | Screening level | Depends on the contaminant | The certifier's listing for each named contaminant |
| Total trihalomethanes (TTHM)33.8 ppb | Federal MCL | Activated carbon, Reverse osmosis | Check the certifier’s listing |
| Copper0.529 mg/L | Action level | Reverse osmosis, Corrosion-control / pH adjustment, Flushing standing water before use | Check the certifier’s listing |
| Arsenic0.003 mg/L | Listed reference | Reverse osmosis, Anion exchange, Activated alumina / adsorptive media | Check the certifier’s listing |
| Lead (90th percentile)3.9 µg/L | Action level | Lead-certified carbon filter, or reverse osmosis | NSF/ANSI 53 (lead) |
| Haloacetic acids (HAA5)13.4 ppb | Federal MCL | Activated carbon, Reverse osmosis | Check the certifier’s listing |
| Fluoride0.7 mg/L | Listed reference | Reverse osmosis, Activated alumina / adsorptive media, Distillation | Check the certifier’s listing |
| Nitrate0.4 mg/L | Listed reference | Reverse osmosis, Anion exchange, Distillation | Check the certifier’s listing |
Each card names which Los Angeles findings its current certification covers, and which it doesn't.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.
Ask your utility first
Water utilities keep an inventory of service-line materials. Ask Los Angeles Department of Water and Power whether your address is on it before you replace pipes.
Local help
Call to be connected with a local plumbing provider about lead service lines, repiping or fixture replacement.
Older buildings may have lead service lines, solder or fixtures. Los Angeles’ record shows lead at 3.9 µg/L (15 µg/L federal action level). Test first-draw water, then filter if needed.
None of the 29 PFAS tested was detected in Los Angeles’ record. If PFAS matters to you, a filter certification names each compound it covers.
Utilities keep a disinfectant in the pipes on the way to your tap. A carbon filter certified for chloramine reduces the taste.
Scale is a comfort and appliance issue, not a health one.
Reverse osmosis reduces many dissolved contaminants, including lead and minerals, at a single faucet, with some water sent to drain.
Get one email when Los Angeles’ record changes.
One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Los Angeles, no regulated PFAS were detected in EPA's 2024 testing; the lead 90th-percentile result was 3.9 µg/L against the 15 µg/L action level. LOS ANGELES-CITY, DEPT. OF WATER & POWER (PWSID CA1910067) has a Purity Score of 90/100 (confidence: high), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap. What we found →
LOS ANGELES-CITY, DEPT. OF WATER & POWER (PWS ID CA1910067) is the public water system on record for Los Angeles, California, serving about 3,875,566 people. Confirm the utility on your water bill before acting on a specific finding. Water utility →
Surface water (primary source of record in EPA SDWIS). Water utility →
None of the 29 PFAS in EPA's UCMR 5 testing (2023-12-26 to 2024-09-11) was detected. "Not detected" means below the lab's reporting limit, not proven zero. What we found →
LOS ANGELES-CITY, DEPT. OF WATER & POWER's most recent lead 90th-percentile result (2021–2023) was 3.9 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink. Your household →
PurityMap's current record for Los Angeles holds 38 findings: 2 above a reference, 7 detected within the reference and 29 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass. Records →
Los Angeles's water is recorded as 8.2 gpg, hard. Hardness is an aesthetic and plumbing characteristic, not a health-based limit. Choose your situation →
| Contaminant | Measured | Reference | Sampled | Source |
|---|---|---|---|---|
| Lithium | 100 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Water hardness | 8.2 gpg | Aesthetic, no federal health limit | 2025 | Utility CCR ↗ (opens in a new tab) |
| Total trihalomethanes (TTHM) | 33.8 ppb | 80 ppb federal MCL | 2025 | Utility CCR ↗ (opens in a new tab) |
| Copper | 0.529 mg/L | 1.3 mg/L (action level) | 2025 | Utility CCR ↗ (opens in a new tab) |
| Arsenic | 0.003 mg/L | 0.010 mg/L | 2025 | Utility CCR ↗ (opens in a new tab) |
| Lead (90th percentile) | 3.9 µg/L | 15 µg/L federal action level | 2021–2023 | EPA SDWIS (Lead & Copper Rule) ↗ (opens in a new tab) |
| Haloacetic acids (HAA5) | 13.4 ppb | 60 ppb federal MCL | 2025 | Utility CCR ↗ (opens in a new tab) |
| Fluoride | 0.7 mg/L | 4.0 mg/L | 2025 | Utility CCR ↗ (opens in a new tab) |
| Nitrate | 0.4 mg/L | 10 mg/L | 2025 | Utility CCR ↗ (opens in a new tab) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L (not detected) | 10 ng/L federal MCL (2024) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L (not detected) | 2,000 ng/L EPA health advisory (screening, not a legal limit) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L (not detected) | 10 ng/L federal MCL (2024) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L (not detected) | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L (not detected) | 10 ng/L federal MCL (2024) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L (not detected) | 4.0 ng/L federal MCL (2024) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L (not detected) | 4.0 ng/L federal MCL (2024) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
UCMR5 Analytical Results
UCMR5 Analytical Results: LOS ANGELES-CITY, DEPT. OF WATER & POWER (CA1910067)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: LOS ANGELES-CITY, DEPT. OF WATER & POWER (CA1910067)
US EPA SDWIS
Consumer Confidence Report (CCR)
Los Angeles Dept. of Water & Power (LADWP) 2025 Consumer Confidence Report (CCR)
Los Angeles Dept. of Water & Power (LADWP)
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
EPA SDWIS, EPA UCMR 5 and utility reports, each dated and linked.
Units converted to one basis; a non-detect kept distinct from zero.
Each result tagged by reference type: MCL, action level, screening level or aesthetic.
Every value sits against its own reference, never a blended one.
Measured subjects summarised at the water-system level; an open health-based violation caps the score.
Treatment is matched to what was found; a product is called certified only when its current certification names it.
What the Purity Score means: a summary of this water system’s published record, capped while a health-based violation is open. It is not a test of any tap. LOS ANGELES-CITY, DEPT. OF WATER & POWER · PWSID CA1910067 · Purity Score 90/100 (Excellent) · Confidence: high · Assessed at the water-system level
Full methodology →Start with the hot-or-cold tap check. Where Los Angeles Department of Water and Power reported something related, it's shown below.
Los Angeles disinfects with chloramine (utility water-quality report).
Lead at Los Angeles Department of Water and Power: 3.9 µg/L (90th percentile, 2021–2023 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.
Copper: 0.529 mg/L (utility water-quality report, 2025). The federal action level is 1.3 mg/L.