Is Cudahy, CA Tap Water Safe? Quality & Contaminants

What was found in Cudahy's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate-Nitrite	440000 µg/L 4400% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Highest in the city: TRACT 349 MUTUAL WATER CO. · 8,700 people · 2013	1/2	SYR4
Nitrate	2200 µg/L 22% of the EPA limit 10000 µg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019	2/2	SYR4
Fluoride	354 µg/L 8.9% of the EPA limit 4000 µg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019 Highest in the city: 400 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2019	2/2	SYR4
Barium	140 µg/L 7% of the EPA limit 2000 µg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019 Highest in the city: 180 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2019	2/2	SYR4
TTHM	11.555 µg/L 14% of the EPA limit 80 µg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019 Highest in the city: 13.76 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2018	2/2	SYR4
Bromoform	6.71 µg/L No EPA limit set Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019 Highest in the city: 12.24 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2018	2/2	SYR4
Trichloroethylene	4.52 µg/L 90% of the EPA limit 5 µg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019	2/2	SYR4
Dibromochloromethane	3.23 µg/L No EPA limit set Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019 Highest in the city: 4.505 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2018	2/2	SYR4
Combined Uranium	3.874 µg/L 13% of the EPA limit 30 µg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019	2/2	SYR4
Dibromoacetic Acid	2 µg/L No EPA limit set Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019 Highest in the city: 2.74 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2018	2/2	SYR4
Total Haloacetic Acids (HAA5)	2 µg/L 3.3% of the EPA limit 60 µg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019 Highest in the city: 2.74 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2018	2/2	SYR4
Arsenic	2.1 µg/L 21% of the EPA limit 10 µg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019 Highest in the city: 2.59 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2019	2/2	SYR4
Tetrachloroethylene	2.3 µg/L 46% of the EPA limit 5 µg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019	1/2	SYR4
Bromodichloromethane	1.8 µg/L No EPA limit set Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019	2/2	SYR4
1,2-Dichloroethane	1.5 µg/L 30% of the EPA limit 5 µg/L Highest in the city: TRACT 349 MUTUAL WATER CO. · 8,700 people · 2019	1/2	SYR4
1,1,2-Trichloroethane	1.2665 µg/L 25% of the EPA limit 5 µg/L Highest in the city: TRACT 349 MUTUAL WATER CO. · 8,700 people · 2019	1/2	SYR4
1,1-Dichloroethylene	0.7700 µg/L 11% of the EPA limit 7 µg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2019	1/2	SYR4
Atrazine	0.1700 µg/L 5.7% of the EPA limit 3 µg/L Highest in the city: TRACT 349 MUTUAL WATER CO. · 8,700 people · 2019	1/2	SYR4
PFOS	0.0240 µg/L No EPA limit set Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2024 Highest in the city: 0.0365 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2023	2/2	UCMR-5
PFOA	0.0065 µg/L No EPA limit set Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2024 Highest in the city: 0.0082 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2023	2/2	UCMR-5
PFHXS	0.0059 µg/L No EPA limit set Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2024 Highest in the city: 0.0066 µg/L — TRACT 349 MUTUAL WATER CO. · 8,700 people · 2023	2/2	UCMR-5
Pfba	0.0053 µg/L No EPA limit set Highest in the city: TRACT 349 MUTUAL WATER CO. · 8,700 people · 2023	1/2	UCMR-5
Pfhxa	0.0031 µg/L No EPA limit set Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2024	1/2	UCMR-5
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: TRACT 180 MUTUAL WATER CO. · 14,000 people · 2025	2/2	LCR

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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Cudahy

Supplier	Population served
TRACT 180 MUTUAL WATER CO.	14,000
TRACT 349 MUTUAL WATER CO.	8,700

Frequently asked questions about Cudahy tap water

Is Cudahy tap water safe to drink?

EPA testing detected 24 contaminants in the water serving Cudahy. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Cudahy?

2 public water suppliers report drinking-water monitoring for Cudahy, California to the EPA. Each is listed above with its population served.

What contaminants are in Cudahy's water?

The contaminants EPA monitoring detected in Cudahy include Nitrate-Nitrite, Nitrate, Fluoride, Barium, TTHM. The full list, with the level at the main supplier and the data source, is in the table above.

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.