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← Hollister, CA

Tap water quality report

ZIP 95023 — Hollister, CA

EPA monitoring across the 2 water suppliers serving ZIP 95023 in Hollister, CA detected 22 contaminants. A detection doesn't automatically mean the water is unsafe — see the highest level found below, with the EPA limit for each.

2
water suppliers
50,971
people served
22
contaminants found

What was found in ZIP 95023

The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
9040 µg/L 90%
of the EPA limit 10000 µg/L
 2/2 SYR4
Nitrate-Nitrite
4900 µg/L 49%
of the EPA limit 10000 µg/L
 2/2 SYR4
Fluoride
380 µg/L 9.5%
of the EPA limit 4000 µg/L
 2/2 SYR4
TTHM
158.96 µg/L 199%
of the EPA limit, in the worst sample — 80 µg/L
 2/2 SYR4
Bromoform
105.05 µg/L
No EPA limit set
 2/2 SYR4
Copper
97 µg/L 7.5%
of the EPA limit 1300 µg/L
 1/2 SYR4
Dibromochloromethane
77.57 µg/L
No EPA limit set
 2/2 SYR4
Chromium
33 µg/L 33%
of the EPA limit 100 µg/L
 2/2 SYR4
Bromodichloromethane
31 µg/L
No EPA limit set
 2/2 SYR4
Lithium
29 µg/L
No EPA limit set
 2/2 UCMR-5
Total Haloacetic Acids (HAA5)
28.1 µg/L 47%
of the EPA limit 60 µg/L
 2/2 SYR4
Dibromoacetic Acid
18.2 µg/L
No EPA limit set
 2/2 SYR4
Lead
11 µg/L 73%
of the EPA limit 15 µg/L
 1/2 SYR4
Chloroform
10 µg/L
No EPA limit set
 2/2 SYR4
Combined Uranium
8.4334 µg/L 28%
of the EPA limit 30 µg/L
 2/2 SYR4
Trichloroacetic Acid
7.1 µg/L
No EPA limit set
 2/2 SYR4
Selenium
6.7 µg/L 13%
of the EPA limit 50 µg/L
 2/2 SYR4
Dichloroacetic Acid
5.1 µg/L
No EPA limit set
 2/2 SYR4
Arsenic
4.3 µg/L 43%
of the EPA limit 10 µg/L
 2/2 SYR4
Monobromoacetic Acid
3 µg/L
No EPA limit set
 2/2 SYR4
PFOA
0.0046 µg/L
No EPA limit set
 1/2 UCMR-5
Lead
0.0023 mg/L 15%
of the EPA limit 0.0150 mg/L
 2/2 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.

Water suppliers serving ZIP 95023

SupplierStatePopulation served
HOLLISTER, CITY OF CA 26,017
SUNNYSLOPE COUNTY WATER DIST CA 24,954

Frequently asked questions about ZIP 95023 tap water

Is the tap water in ZIP 95023 safe to drink?

EPA testing detected 22 contaminants across the water suppliers serving ZIP 95023. 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 95023?

2 public water suppliers report EPA drinking-water monitoring for ZIP 95023. Each is listed above with its population served.

What contaminants are in ZIP 95023's water?

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