Is El Monte-City, Water Dept. Tap Water Safe? Quality Report

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
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).

Contaminant	Max	Detection rate	Period
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 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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	9150 µg/L 92% of the EPA limit 10000 µg/L worst single sample: 15119.4 µg/L	808/810	SYR4	2012–2019
Tetrachloroethylene	24 µg/L 480% of the EPA limit, at the 95th percentile of samples — 5 µg/L worst single sample: 60 µg/L	586/2616	SYR4	2012–2019
Trichloroethylene	58 µg/L 1160% of the EPA limit, at the 95th percentile of samples — 5 µg/L worst single sample: 87 µg/L	421/2609	SYR4	2012–2019
Fluoride	784.75 µg/L 20% of the EPA limit 4000 µg/L worst single sample: 1000 µg/L	158/159	SYR4	2012–2019
TTHM	7.72 µg/L 9.7% of the EPA limit 80 µg/L worst single sample: 17 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	1.1825 µg/L 24% of the EPA limit 5 µg/L worst single sample: 1.5 µg/L	26/1225	SYR4	2012–2019
Combined Uranium	9.9532 µg/L 33% of the EPA limit 30 µg/L worst single sample: 11.622 µg/L	17/17	SYR4	2012–2019
cis-1,2-Dichloroethylene	0.9500 µg/L 1.4% of the EPA limit 70 µg/L worst single sample: 1.1 µg/L	16/47	SYR4	2012–2019
Copper	326.2 µg/L 25% of the EPA limit 1300 µg/L worst single sample: 370 µg/L	13/141	SYR4	2012–2019
Bromoform	4.82 µg/L No EPA limit set worst single sample: 5.1 µg/L	9/128	SYR4	2012–2019
Dibromochloromethane	3.45 µg/L No EPA limit set worst single sample: 3.6 µg/L	6/128	SYR4	2012–2019
Dibromoacetic Acid	1.56 µg/L No EPA limit set worst single sample: 1.6 µg/L	5/124	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	1.56 µg/L 2.6% of the EPA limit 60 µg/L worst single sample: 1.6 µg/L	5/124	SYR4	2012–2019
Nitrite	1.491 µg/L 0.1% of the EPA limit 1000 µg/L worst single sample: 1.5 µg/L	4/32	SYR4	2012–2019
Bromodichloromethane	3.9 µg/L No EPA limit set worst single sample: 4.2 µg/L	3/128	SYR4	2012–2019
1,1-Dichloroethylene	0.5875 µg/L 8.4% of the EPA limit 7 µg/L worst single sample: 0.5900 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: [email protected]

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.