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Tap water quality report

Oceano, CA

EPA monitoring detected 20 contaminants across the 1 water supplier serving Oceano. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

1
water supplier
7,601
people served
20
contaminants found
California rankings Lead in California PFAS in California

What was found in Oceano's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
7400 µg/L 74%
of the EPA limit 10000 µg/L
 1/1 SYR4
Nitrate-Nitrite
7100 µg/L 71%
of the EPA limit 10000 µg/L
 1/1 SYR4
Fluoride
390 µg/L 9.8%
of the EPA limit 4000 µg/L
 1/1 SYR4
Selenium
150 µg/L 300%
of the EPA limit, in the worst sample — 50 µg/L
 1/1 SYR4
Copper
89 µg/L 6.8%
of the EPA limit 1300 µg/L
 1/1 SYR4
TTHM
76.1 µg/L 95%
of the EPA limit 80 µg/L
 1/1 SYR4
Chloroform
50.6 µg/L
No EPA limit set
 1/1 SYR4
Total Haloacetic Acids (HAA5)
38 µg/L 63%
of the EPA limit 60 µg/L
 1/1 SYR4
Bromodichloromethane
20.8 µg/L
No EPA limit set
 1/1 SYR4
Dichloroacetic Acid
19.4 µg/L
No EPA limit set
 1/1 SYR4
Dibromochloromethane
17.7 µg/L
No EPA limit set
 1/1 SYR4
Trichloroacetic Acid
16.6 µg/L
No EPA limit set
 1/1 SYR4
Combined Uranium
12.367 µg/L 41%
of the EPA limit 30 µg/L
 1/1 SYR4
Bromoform
11.8 µg/L
No EPA limit set
 1/1 SYR4
Dibromoacetic Acid
8 µg/L
No EPA limit set
 1/1 SYR4
Lead
6.9 µg/L 46%
of the EPA limit 15 µg/L
 1/1 SYR4
Arsenic
2.9 µg/L 29%
of the EPA limit 10 µg/L
 1/1 SYR4
Monochloroacetic Acid
2.5 µg/L
No EPA limit set
 1/1 SYR4
Cadmium
1.4 µg/L 28%
of the EPA limit 5 µg/L
 1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 1/1 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 single worst sample on record — 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 Oceano

SupplierPopulation served
OCEANO COMM SERVICES DIST. 7,601

Frequently asked questions about Oceano tap water

Is Oceano tap water safe to drink?

EPA testing detected 20 contaminants in the water serving Oceano. 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 Oceano?

1 public water supplier report drinking-water monitoring for Oceano, California to the EPA. Each is listed above with its population served.

What contaminants are in Oceano's water?

The contaminants EPA monitoring detected in Oceano include Nitrate, Nitrate-Nitrite, Fluoride, Selenium, Copper. The full list, with the highest level found 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.