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Tap water quality report

Downey - City, Water Dept.

EPA monitoring tested this supplier for 75 contaminants and detected 21. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

75
contaminants tested
21
detected
110,556
people served
6
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Ground water
Ownership
Local government
Counties served
Los Angeles

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

6
health-based violations
12
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2018-02-01
TT Health-based Resolved 2018-02-01
MCL Health-based Resolved 2008-09-01 → 2008-09-30
MCL Health-based Resolved 2008-09-01 → 2008-09-30
MCL Health-based Resolved 2003-08-01 → 2003-08-31
MCL Health-based Resolved 2003-08-01 → 2003-08-31
MR Monitoring Resolved 2013-09-01 → 2013-09-30
MR Monitoring Resolved 2013-09-01 → 2013-09-30
MR Monitoring Resolved 2013-09-01 → 2013-09-30
MR Monitoring Resolved 2012-05-24

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0089 µg/L 10/10 2025
Pfhxa 0.0210 µg/L 10/10 2025
PFOA 0.0150 µg/L 10/10 2025
PFOS 0.0440 µg/L 10/10 2025
Pfpea 0.0270 µg/L 10/10 2025
PFHXS 0.0089 µg/L 9/10 2025
Pfba 0.0100 µg/L 8/10 2025
Pfhpa 0.0042 µg/L 4/10 2025

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
3700 µg/L 37%
of the EPA limit 10000 µg/L
worst single sample: 4900 µg/L
310/316 SYR4 2012–2019
Nitrate-Nitrite
3935 µg/L 39%
of the EPA limit 10000 µg/L
worst single sample: 4900 µg/L
74/77 SYR4 2016–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 72/72 LCR 2023
Tetrachloroethylene
3.155 µg/L 63%
of the EPA limit 5 µg/L
worst single sample: 3.7 µg/L
70/279 SYR4 2012–2019
Fluoride
400 µg/L 10%
of the EPA limit 4000 µg/L
worst single sample: 430 µg/L
54/54 SYR4 2012–2019
Combined Uranium
5.65455 µg/L 19%
of the EPA limit 30 µg/L
worst single sample: 5.662 µg/L
22/29 SYR4 2016–2018
Trichloroethylene
1.2 µg/L 24%
of the EPA limit 5 µg/L
worst single sample: 1.4 µg/L
22/178 SYR4 2012–2019
Arsenic
2.78 µg/L 28%
of the EPA limit 10 µg/L
worst single sample: 3.5 µg/L
19/54 SYR4 2012–2019
Barium
120 µg/L 6%
of the EPA limit 2000 µg/L
 5/55 SYR4 2012–2019
cis-1,2-Dichloroethylene
0.6560 µg/L 0.9%
of the EPA limit 70 µg/L
worst single sample: 0.6600 µg/L
3/159 SYR4 2012–2019
Antimony, Total
13 µg/L 217%
of the EPA limit, at the 95th percentile of samples — 6 µg/L
 1/56 SYR4 2012–2019
Copper
200 µg/L 15%
of the EPA limit 1300 µg/L
 1/54 SYR4 2012–2019
Lead
25 µg/L 167%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
 1/56 SYR4 2012–2019
54 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAtrazineBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbon TetrachlorideChromiumDichloromethaneDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateEthylbenzeneHfpo-DaLassoMercuryNetfosaaNfdhaNmefosaaNitritePfdaPfdoaPfeesaPfhpsPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaSeleniumSimazineStyreneThallium, TotalTolueneVinyl ChlorideXylenes, TotalLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MUELLER, DAN
Phone
562-904-7110
Email
[email protected]

Frequently asked questions about Downey - City, Water Dept.

Is Downey - City, Water Dept. tap water safe to drink?

EPA monitoring detected 21 contaminants in Downey - City, Water Dept.'s water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Downey - City, Water Dept.'s water?

EPA monitoring detected Nitrate, Nitrate-Nitrite, Lead, Tetrachloroethylene, Fluoride, and others. The full list with the level and data source for each is above.

How many people does Downey - City, Water Dept. serve?

Downey - City, Water Dept. reports serving 110,556 people in California, per its EPA record.

Has Downey - City, Water Dept. had any water quality violations?

The EPA has 12 violations on file for Downey - City, Water Dept., of which 6 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.