Tap WaterIndex

← California

Tap water quality report

Barstow, CA

EPA monitoring detected 16 contaminants across the 3 water suppliers serving Barstow. 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
1,364
people served
16
contaminants found
California rankings Lead in California PFAS in California

What was found in Barstow'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
930000 µg/L 9300%
of the EPA limit, in the worst sample — 10000 µg/L
 2/3 SYR4
Nitrate
3600 µg/L 36%
of the EPA limit 10000 µg/L
 2/3 SYR4
Fluoride
1500 µg/L 38%
of the EPA limit 4000 µg/L
 2/3 SYR4
Lithium
79 µg/L
No EPA limit set
 1/3 UCMR-5
TTHM
38 µg/L 48%
of the EPA limit 80 µg/L
 1/3 SYR4
Arsenic
25 µg/L 250%
of the EPA limit, in the worst sample — 10 µg/L
 2/3 SYR4
Combined Uranium
22.648 µg/L 75%
of the EPA limit 30 µg/L
 2/3 SYR4
Bromoform
15 µg/L
No EPA limit set
 1/3 SYR4
Dibromochloromethane
15 µg/L
No EPA limit set
 1/3 SYR4
Total Haloacetic Acids (HAA5)
9.6 µg/L 16%
of the EPA limit 60 µg/L
 1/3 SYR4
Bromodichloromethane
7.9 µg/L
No EPA limit set
 1/3 SYR4
Dibromoacetic Acid
6.1 µg/L
No EPA limit set
 1/3 SYR4
Copper
4.67 µg/L 0.4%
of the EPA limit 1300 µg/L
 1/3 SYR4
Dichloroacetic Acid
3.7 µg/L
No EPA limit set
 1/3 SYR4
Chloroform
2.9 µg/L
No EPA limit set
 1/3 SYR4
Lead
0.6500 mg/L 4333%
above the EPA limit of 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 Barstow

SupplierPopulation served
USMC NEBO (BARSTOW) 1,126
BAR-LEN MWC 126
HI DESERT MWC 112

Frequently asked questions about Barstow tap water

Is Barstow tap water safe to drink?

EPA testing detected 16 contaminants in the water serving Barstow. 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 Barstow?

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

What contaminants are in Barstow's water?

The contaminants EPA monitoring detected in Barstow include Nitrate-Nitrite, Nitrate, Fluoride, Lithium, 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.