← Rialto, CA

Tap water quality report

ZIP 92316 — Rialto, CA

EPA monitoring across the 1 water supplier serving ZIP 92316 in Rialto, CA detected 19 contaminants. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier below, with the EPA limit for each.

1
water supplier
104,498
people served
19
contaminants found

What was found in ZIP 92316

The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate-Nitrite
451999.99999999994 µg/L 4520%
of the EPA limit, at the 95th percentile of samples — 10000 µg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Nitrate
8588 µg/L 86%
of the EPA limit 10000 µg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Fluoride
410 µg/L 10%
of the EPA limit 4000 µg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Copper
83 µg/L 6.4%
of the EPA limit 1300 µg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
TTHM
65.17999999999999 µg/L 81%
of the EPA limit 80 µg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Dibromochloromethane
23.574999999999996 µg/L
No EPA limit set
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Bromodichloromethane
19.389999999999997 µg/L
No EPA limit set
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Chloroform
18.025 µg/L
No EPA limit set
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
16.039999999999978 µg/L 27%
of the EPA limit 60 µg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Bromoform
14.479999999999995 µg/L
No EPA limit set
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Combined Uranium
10.653499999999996 µg/L 36%
of the EPA limit 30 µg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Arsenic
9.2 µg/L 92%
of the EPA limit 10 µg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Dibromoacetic Acid
8.239999999999995 µg/L
No EPA limit set
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Dichloroacetic Acid
6.675 µg/L
No EPA limit set
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Trichloroacetic Acid
4.814999999999999 µg/L
No EPA limit set
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Toluene
1.7 µg/L 0.2%
of the EPA limit 1000 µg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Monobromoacetic Acid
1.2899999999999998 µg/L
No EPA limit set
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Tetrachloroethylene
1.25 µg/L 25%
of the EPA limit 5 µg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2019
1/1 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
Main supplier: WEST VALLEY WATER DISTRICT · 104,498 people · 2024
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.

Water suppliers serving ZIP 92316

SupplierStatePopulation served
WEST VALLEY WATER DISTRICT CA 104,498

Frequently asked questions about ZIP 92316 tap water

Is the tap water in ZIP 92316 safe to drink?

EPA testing detected 19 contaminants across the water suppliers serving ZIP 92316. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.

Which water suppliers serve ZIP 92316?

1 public water supplier report EPA drinking-water monitoring for ZIP 92316. Each is listed above with its population served.

What contaminants are in ZIP 92316's water?

EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Copper, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.