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Tap water quality report

Fountain Valley, CA

EPA monitoring detected 22 contaminants across the 1 water supplier serving Fountain Valley. 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
56,747
people served
22
contaminants found
California rankings Lead in California PFAS in California

What was found in Fountain Valley'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-Nitrite
769999.9999999999 µg/L 7700%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Nitrate
2220.8100000000004 µg/L 22%
of the EPA limit 10000 µg/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Fluoride
750 µg/L 19%
of the EPA limit 4000 µg/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Copper
159.4 µg/L 12%
of the EPA limit 1300 µg/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Barium
104.8 µg/L 5.2%
of the EPA limit 2000 µg/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
TTHM
51.4 µg/L 64%
of the EPA limit 80 µg/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Lithium
36.1233 µg/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2025
1/1 UCMR-5
Total Haloacetic Acids (HAA5)
20.034999999999997 µg/L 33%
of the EPA limit 60 µg/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Dibromochloromethane
17.684999999999995 µg/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Chloroform
16.425 µg/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Bromodichloromethane
16.365 µg/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Combined Uranium
13.868919999999997 µg/L 46%
of the EPA limit 30 µg/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Bromoform
9.4 µg/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Dichloroacetic Acid
8.825000000000001 µg/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Trichloroacetic Acid
6.159999999999999 µg/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Dibromoacetic Acid
5.890000000000001 µg/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Gross Beta Particle Activity
4.001999999999999 pCi/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2013
1/1 SYR4
Monochloroacetic Acid
3.5 µg/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Arsenic
2.4899999999999998 µg/L 25%
of the EPA limit 10 µg/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
0.8303 pCi/L 17%
of the EPA limit 5 pCi/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2013
1/1 SYR4
Lead
0.0060 mg/L 40%
of the EPA limit 0.0150 mg/L
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2024
1/1 LCR
PFHXS
0.0035 µg/L
No EPA limit set
Main supplier: CITY OF FOUNTAIN VALLEY · 56,747 people · 2025
1/1 UCMR-5
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 Fountain Valley

SupplierPopulation served
CITY OF FOUNTAIN VALLEY 56,747

Frequently asked questions about Fountain Valley tap water

Is Fountain Valley tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Fountain Valley. 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 Fountain Valley?

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

What contaminants are in Fountain Valley's water?

The contaminants EPA monitoring detected in Fountain Valley include Nitrate-Nitrite, Nitrate, Fluoride, Copper, Barium. 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.