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Tap water quality report

San Clemente, CA

EPA monitoring detected 16 contaminants across the 1 water supplier serving San Clemente. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
51,545
people served
16
contaminants found
California rankings Lead in California PFAS in California

What was found in San Clemente'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
2111.8 µg/L 21%
of the EPA limit 10000 µg/L
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Fluoride
547.5 µg/L 14%
of the EPA limit 4000 µg/L
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2018
1/1 SYR4
Barium
71.8 µg/L 3.6%
of the EPA limit 2000 µg/L
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2018
1/1 SYR4
Lithium
60 µg/L
No EPA limit set
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2024
1/1 UCMR-5
TTHM
55.92 µg/L 70%
of the EPA limit 80 µg/L
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
25.73 µg/L 43%
of the EPA limit 60 µg/L
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Dibromochloromethane
20.64 µg/L
No EPA limit set
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Chloroform
19.25 µg/L
No EPA limit set
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Bromodichloromethane
16.3 µg/L
No EPA limit set
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Dichloroacetic Acid
15.285 µg/L
No EPA limit set
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Trichloroacetic Acid
10.47 µg/L
No EPA limit set
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Bromoform
8.034 µg/L
No EPA limit set
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Dibromoacetic Acid
7.118 µg/L
No EPA limit set
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Monobromoacetic Acid
4.84 µg/L
No EPA limit set
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2019
1/1 SYR4
Combined Uranium
1.49 µg/L 5%
of the EPA limit 30 µg/L
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2017
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF SAN CLEMENTE · 51,545 people · 2025
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 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 San Clemente

SupplierPopulation served
CITY OF SAN CLEMENTE 51,545

Frequently asked questions about San Clemente tap water

Is San Clemente tap water safe to drink?

EPA testing detected 16 contaminants in the water serving San Clemente. 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 San Clemente?

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

What contaminants are in San Clemente's water?

The contaminants EPA monitoring detected in San Clemente include Nitrate, Fluoride, Barium, Lithium, 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.