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Tap water quality report

San Simeon, CA

EPA monitoring detected 14 contaminants across the 2 water suppliers serving San Simeon. 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.

2
water suppliers
601
people served
14
contaminants found
California rankings Lead in California PFAS in California

What was found in San Simeon'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
2115 µg/L 21%
of the EPA limit 10000 µg/L
Main supplier: SAN SIMEON CSD · 462 people · 2019
1/2 SYR4
Nitrate-Nitrite
2025 µg/L 20%
of the EPA limit 10000 µg/L
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Barium
179 µg/L 9%
of the EPA limit 2000 µg/L
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Fluoride
146.5 µg/L 3.7%
of the EPA limit 4000 µg/L
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
TTHM
22 µg/L 28%
of the EPA limit 80 µg/L
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Bromoform
18.6 µg/L
No EPA limit set
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Dibromochloromethane
8.06 µg/L
No EPA limit set
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Total Haloacetic Acids (HAA5)
6.875 µg/L 11%
of the EPA limit 60 µg/L
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Dibromoacetic Acid
6.72 µg/L
No EPA limit set
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Selenium
6 µg/L 12%
of the EPA limit 50 µg/L
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Bromodichloromethane
4.63 µg/L
No EPA limit set
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Chloroform
1.6 µg/L
No EPA limit set
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Dichloroacetic Acid
1 µg/L
No EPA limit set
Main supplier: SAN SIMEON CSD · 462 people · 2017
1/2 SYR4
Lead
0.0450 mg/L 300%
above the EPA limit of 0.0150 mg/L
Main supplier: SAN SIMEON CSD · 462 people · 2025
1/2 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 San Simeon

SupplierPopulation served
SAN SIMEON CSD 462
GRAN CIELO MUTUAL WATER COMPANY 139

Frequently asked questions about San Simeon tap water

Is San Simeon tap water safe to drink?

EPA testing detected 14 contaminants in the water serving San Simeon. 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 Simeon?

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

What contaminants are in San Simeon's water?

The contaminants EPA monitoring detected in San Simeon include Nitrate, Nitrate-Nitrite, Barium, Fluoride, 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.