Tap WaterIndex

← California

Tap water quality report

Fontana, CA

EPA monitoring detected 21 contaminants across the 1 water supplier serving Fontana. 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
237,700
people served
21
contaminants found
California rankings Lead in California PFAS in California

What was found in Fontana'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-Nitrite
1000000 µg/L 10000%
of the EPA limit, in the worst sample — 10000 µg/L
 1/1 SYR4
Nitrate
14464 µg/L 145%
of the EPA limit, in the worst sample — 10000 µg/L
 1/1 SYR4
Fluoride
660 µg/L 17%
of the EPA limit 4000 µg/L
 1/1 SYR4
Copper
220 µg/L 17%
of the EPA limit 1300 µg/L
 1/1 SYR4
TTHM
76 µg/L 95%
of the EPA limit 80 µg/L
 1/1 SYR4
Chloroform
36 µg/L
No EPA limit set
 1/1 SYR4
Total Haloacetic Acids (HAA5)
30 µg/L 50%
of the EPA limit 60 µg/L
 1/1 SYR4
Dibromochloromethane
29 µg/L
No EPA limit set
 1/1 SYR4
Bromoform
25 µg/L
No EPA limit set
 1/1 SYR4
Bromodichloromethane
23 µg/L
No EPA limit set
 1/1 SYR4
Lead
19 µg/L 127%
of the EPA limit, in the worst sample — 15 µg/L
 1/1 SYR4
Dichloromethane
15 µg/L 300%
of the EPA limit, in the worst sample — 5 µg/L
 1/1 SYR4
Dichloroacetic Acid
14 µg/L
No EPA limit set
 1/1 SYR4
Trichloroacetic Acid
14 µg/L
No EPA limit set
 1/1 SYR4
Dibromoacetic Acid
7.7 µg/L
No EPA limit set
 1/1 SYR4
Tetrachloroethylene
7.6 µg/L 152%
of the EPA limit, in the worst sample — 5 µg/L
 1/1 SYR4
Arsenic
6.2 µg/L 62%
of the EPA limit 10 µg/L
 1/1 SYR4
Combined Uranium
5.215 µg/L 17%
of the EPA limit 30 µg/L
 1/1 SYR4
Monobromoacetic Acid
1.1 µg/L
No EPA limit set
 1/1 SYR4
1,2-DIBROMO-3-CHLOROPROPANE
0.0130 µg/L 6.5%
of the EPA limit 0.2000 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 Fontana

SupplierPopulation served
SAN GABRIEL VALLEY WC - FONTANA 237,700

Frequently asked questions about Fontana tap water

Is Fontana tap water safe to drink?

EPA testing detected 21 contaminants in the water serving Fontana. 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 Fontana?

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

What contaminants are in Fontana's water?

The contaminants EPA monitoring detected in Fontana include Nitrate-Nitrite, Nitrate, Fluoride, Copper, TTHM. 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.