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Tap water quality report

El Monte-City, Water Dept.

EPA monitoring tested this supplier for 84 contaminants and detected 22. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

84
contaminants tested
22
detected
22,968
people served
10
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.

10
health-based violations
18
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2012-08-01 → 2012-08-31
MCL Health-based Resolved 2012-08-01 → 2012-08-31
MCL Health-based Resolved 1996-11-01 → 1996-11-30
MCL Health-based Resolved 1996-11-01 → 1996-11-30
MCL Health-based Resolved 1993-10-01 → 1993-10-31
MCL Health-based Resolved 1993-10-01 → 1993-10-31
MCL Health-based Resolved 1993-06-01 → 1993-06-30
MCL Health-based Resolved 1993-06-01 → 1993-06-30
MCL Health-based Resolved 1992-09-01 → 1992-09-30
MCL Health-based Resolved 1992-09-01 → 1992-09-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFHXS 0.0032 µg/L 1/8 2024
PFOS 0.0044 µg/L 1/8 2024

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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
15119.4 µg/L 151%
of the EPA limit, in the worst sample — 10000 µg/L
 808/810 SYR4 2012–2019
Tetrachloroethylene
60 µg/L 1200%
of the EPA limit, in the worst sample — 5 µg/L
 586/2616 SYR4 2012–2019
Trichloroethylene
87 µg/L 1740%
of the EPA limit, in the worst sample — 5 µg/L
 421/2609 SYR4 2012–2019
Fluoride
1000 µg/L 25%
of the EPA limit 4000 µg/L
 158/159 SYR4 2012–2019
TTHM
17 µg/L 21%
of the EPA limit 80 µg/L
 49/128 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 37/37 LCR 2026
Carbon Tetrachloride
1.5 µg/L 30%
of the EPA limit 5 µg/L
 26/1225 SYR4 2012–2019
Combined Uranium
11.622 µg/L 39%
of the EPA limit 30 µg/L
 17/17 SYR4 2012–2019
cis-1,2-Dichloroethylene
1.1 µg/L 1.6%
of the EPA limit 70 µg/L
 16/47 SYR4 2012–2019
Copper
370 µg/L 28%
of the EPA limit 1300 µg/L
 13/141 SYR4 2012–2019
Bromoform
5.1 µg/L
No EPA limit set
 9/128 SYR4 2012–2019
Dibromochloromethane
3.6 µg/L
No EPA limit set
 6/128 SYR4 2012–2019
Dibromoacetic Acid
1.6 µg/L
No EPA limit set
 5/124 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
1.6 µg/L 2.7%
of the EPA limit 60 µg/L
 5/124 SYR4 2012–2019
Nitrite
1.5 µg/L 0.2%
of the EPA limit 1000 µg/L
 4/32 SYR4 2012–2019
Bromodichloromethane
4.2 µg/L
No EPA limit set
 3/128 SYR4 2012–2019
1,1-Dichloroethylene
0.5900 µg/L 8.4%
of the EPA limit 7 µg/L
 2/37 SYR4 2012–2019
Barium
170 µg/L 8.5%
of the EPA limit 2000 µg/L
 1/14 SYR4 2013–2019
Chloroform
11 µg/L
No EPA limit set
 1/128 SYR4 2012–2019
Di(2-ethylhexyl) Phthalate
4.4 µg/L 73%
of the EPA limit 6 µg/L
 1/36 SYR4 2012–2019
62 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicAtrazineBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumChromiumDichloromethaneDi(2-ethylhexyl) AdipateDichloroacetic AcidEthylbenzeneHfpo-DaLassoMercuryMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPfmbaPfmpaPFNAPFOAPfpeaPfpesPftaPftrdaPfunaSeleniumSimazineStyreneThallium, TotalTolueneTrichloroacetic AcidVinyl ChlorideXylenes, TotalLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
NGUYEN, DON
Phone
626-258-8603
Email
dnguyen@elmonteca.gov

Frequently asked questions about El Monte-City, Water Dept.

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

EPA monitoring detected 22 contaminants in El Monte-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 El Monte-City, Water Dept.'s water?

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

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

El Monte-City, Water Dept. reports serving 22,968 people in California, per its EPA record.

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

The EPA has 18 violations on file for El Monte-City, Water Dept., of which 10 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.