Is Monterey Park-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
TT	Health-based	Unaddressed	2024-10-17
RPT	Monitoring	Unaddressed	2024-10-17
MR	Monitoring	Resolved	2005-04-01 → 2005-04-30
MR	Monitoring	Resolved	2005-04-01 → 2005-04-30

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfba	0.0074 µg/L	2/2	2025
Pfpea	0.0050 µg/L	1/2	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.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Nitrate	5800 µg/L 58% of the EPA limit 10000 µg/L worst single sample: 7300 µg/L	7028/7334	SYR4	2012–2019
Tetrachloroethylene	78.25 µg/L 1565% of the EPA limit, at the 95th percentile of samples — 5 µg/L worst single sample: 190 µg/L	2456/15087	SYR4	2012–2019
cis-1,2-Dichloroethylene	1.3 µg/L 1.9% of the EPA limit 70 µg/L worst single sample: 2.5 µg/L	1678/15060	SYR4	2012–2019
Trichloroethylene	2.9 µg/L 58% of the EPA limit 5 µg/L worst single sample: 3.7 µg/L	1452/15087	SYR4	2012–2019
Arsenic	15 µg/L 150% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 18 µg/L	950/2298	SYR4	2012–2019
TTHM	9.03 µg/L 11% of the EPA limit 80 µg/L worst single sample: 18 µg/L	118/13564	SYR4	2012–2019
Bromoform	6.36 µg/L No EPA limit set worst single sample: 12 µg/L	105/13765	SYR4	2012–2019
Dibromochloromethane	3.065 µg/L No EPA limit set worst single sample: 4.4 µg/L	88/13766	SYR4	2012–2019
Dichloromethane	2.44 µg/L 49% of the EPA limit 5 µg/L worst single sample: 4.4 µg/L	77/14908	SYR4	2012–2019
Fluoride	908 µg/L 23% of the EPA limit 4000 µg/L worst single sample: 970 µg/L	45/45	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	2.4 µg/L 4% of the EPA limit 60 µg/L worst single sample: 3.1 µg/L	42/124	SYR4	2012–2019
Dibromoacetic Acid	2.31 µg/L No EPA limit set worst single sample: 2.4 µg/L	39/124	SYR4	2012–2019
1,1-Dichloroethylene	0.5300 µg/L 7.6% of the EPA limit 7 µg/L worst single sample: 0.5500 µg/L	31/15000	SYR4	2012–2019
Chloroform	0.2260 µg/L No EPA limit set worst single sample: 0.2400 µg/L	29/13766	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	29/29	LCR	2024
Combined Uranium	16.7625 µg/L 56% of the EPA limit 30 µg/L worst single sample: 19.37 µg/L	11/13	SYR4	2012–2019
Toluene	0.1000 µg/L 0% of the EPA limit 1000 µg/L	7/14933	SYR4	2012–2019
Nitrate-Nitrite	6175 µg/L 62% of the EPA limit 10000 µg/L worst single sample: 6500 µg/L	6/8	SYR4	2018–2019
Monochloroacetic Acid	3.04 µg/L No EPA limit set worst single sample: 3.1 µg/L	4/124	SYR4	2012–2019
Bromodichloromethane	1.46 µg/L No EPA limit set worst single sample: 1.5 µg/L	3/13766	SYR4	2012–2019
Copper	145.15 µg/L 11% of the EPA limit 1300 µg/L worst single sample: 150 µg/L	2/24	SYR4	2012–2019
trans-1,2-Dichloroethylene	0.2680 µg/L 0.3% of the EPA limit 100 µg/L worst single sample: 0.2700 µg/L	2/14933	SYR4	2012–2019
1,2,4-Trichlorobenzene	0.6100 µg/L 0.9% of the EPA limit 70 µg/L	1/14935	SYR4	2012–2019
Xylenes, Total	1.2 µg/L 0% of the EPA limit 10000 µg/L	1/14726	SYR4	2012–2019

86 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneThallium, TotalTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidVinyl ChlorideLithiumO-DichlorobenzeneP-Dichlorobenzene

Utility contact

Contact: VELAZQUEZ, ERIC
Phone: 626-280-5552
Email: [email protected]

Frequently asked questions about Monterey Park-City, Water Dept.

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

EPA monitoring detected 26 contaminants in Monterey Park-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 Monterey Park-City, Water Dept.'s water?

EPA monitoring detected Nitrate, Tetrachloroethylene, cis-1,2-Dichloroethylene, Trichloroethylene, Arsenic, and others. The full list with the level and data source for each is above.

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

Monterey Park-City, Water Dept. reports serving 62,183 people in California, per its EPA record.

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

The EPA has 4 violations on file for Monterey Park-City, Water Dept., of which 1 is health-based (a contaminant limit or required treatment was breached) and 2 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.