Tap WaterIndex

← California

Tap water quality report

Wasco, CA

EPA monitoring detected 20 contaminants across the 3 water suppliers serving Wasco. A detection doesn't automatically mean the water is unsafe — see the highest level found for each below, with its EPA source and period.

3
water suppliers
27,929
people served
20
contaminants found
California rankings Lead in California PFAS in California

What was found in Wasco'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
14000 µg/L 140%
of the EPA limit, in the worst sample — 10000 µg/L
 3/3 SYR4
Fluoride
320 µg/L 8%
of the EPA limit 4000 µg/L
 2/3 SYR4
Barium
72 µg/L 3.6%
of the EPA limit 2000 µg/L
 2/3 SYR4
TTHM
27 µg/L 34%
of the EPA limit 80 µg/L
 2/3 SYR4
Arsenic
18 µg/L 180%
of the EPA limit, in the worst sample — 10 µg/L
 3/3 SYR4
Bromoform
18 µg/L
No EPA limit set
 2/3 SYR4
Lithium
9.1 µg/L
No EPA limit set
 1/3 UCMR-5
Chromium
8.6 µg/L 8.6%
of the EPA limit 100 µg/L
 1/3 SYR4
Dibromochloromethane
7.2 µg/L
No EPA limit set
 2/3 SYR4
Total Haloacetic Acids (HAA5)
4.8 µg/L 8%
of the EPA limit 60 µg/L
 2/3 SYR4
Dibromoacetic Acid
3.5 µg/L
No EPA limit set
 2/3 SYR4
Trichloroacetic Acid
2.9 µg/L
No EPA limit set
 1/3 SYR4
Selenium
2.6 µg/L 5.2%
of the EPA limit 50 µg/L
 2/3 SYR4
Bromodichloromethane
2.5 µg/L
No EPA limit set
 2/3 SYR4
Combined Radium (-226 And -228)
1.64 pCi/L 33%
of the EPA limit 5 pCi/L
 1/3 SYR4
1,1-Dichloroethylene
1.3 µg/L 19%
of the EPA limit 7 µg/L
 1/3 SYR4
Chloroform
1 µg/L
No EPA limit set
 2/3 SYR4
Ethylene Dibromide
0.4100 µg/L 820%
of the EPA limit, in the worst sample — 0.0500 µg/L
 1/3 SYR4
1,2-DIBROMO-3-CHLOROPROPANE
0.1100 µg/L 55%
of the EPA limit 0.2000 µg/L
 1/3 SYR4
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 3/3 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 Wasco

SupplierPopulation served
WASCO, CITY OF 22,757
WASCO ST. PRISON RECEPTION CTR 5,124
POND MUTUAL WATER COMPANY 48

Frequently asked questions about Wasco tap water

Is Wasco tap water safe to drink?

EPA testing detected 20 contaminants in the water serving Wasco. 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 Wasco?

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

What contaminants are in Wasco's water?

The contaminants EPA monitoring detected in Wasco include Nitrate, Fluoride, Barium, TTHM, Arsenic. 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.