What was found in ZIP 95023
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.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 8588 µg/L 86% of the EPA limit 10000 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 4810 µg/L 48% of the EPA limit 10000 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019 | 2/2 | SYR4 |
| Fluoride | 365 µg/L 9.1% of the EPA limit 4000 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2017 | 2/2 | SYR4 |
| TTHM | 100.256 µg/L 125% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019 | 2/2 | SYR4 |
| Copper | 96.5 µg/L 7.4% of the EPA limit 1300 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2017 | 1/2 | SYR4 |
| Bromoform | 62.668 µg/L No EPA limit set Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 33.292 µg/L No EPA limit set Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019 | 2/2 | SYR4 |
| Lithium | 29 µg/L No EPA limit set Main supplier: HOLLISTER, CITY OF · 26,017 people · 2024 | 2/2 | UCMR-5 |
| Chromium | 28.75 µg/L 29% of the EPA limit 100 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2017 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 18.59 µg/L 31% of the EPA limit 60 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 14.925 µg/L No EPA limit set Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 11.35 µg/L No EPA limit set Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019
Highest in the ZIP: 13.25 µg/L — SUNNYSLOPE COUNTY WATER DIST · 24,954 people · 2019 | 2/2 | SYR4 |
| Lead | 11 µg/L 73% of the EPA limit 15 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2014 | 1/2 | SYR4 |
| Combined Uranium | 8.4334 µg/L 28% of the EPA limit 30 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2017 | 2/2 | SYR4 |
| Selenium | 6.56 µg/L 13% of the EPA limit 50 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2017 | 2/2 | SYR4 |
| Chloroform | 4.038 µg/L No EPA limit set Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019
Highest in the ZIP: 6.4 µg/L — SUNNYSLOPE COUNTY WATER DIST · 24,954 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 4.85 µg/L No EPA limit set Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 3.15 µg/L No EPA limit set Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019
Highest in the ZIP: 4.245 µg/L — SUNNYSLOPE COUNTY WATER DIST · 24,954 people · 2019 | 2/2 | SYR4 |
| Arsenic | 4.195 µg/L 42% of the EPA limit 10 µg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2017 | 2/2 | SYR4 |
| Monobromoacetic Acid | 2.39 µg/L No EPA limit set Main supplier: HOLLISTER, CITY OF · 26,017 people · 2019 | 2/2 | SYR4 |
| PFOA | 0.0046 µg/L No EPA limit set Highest in the ZIP: SUNNYSLOPE COUNTY WATER DIST · 24,954 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0023 mg/L 15% of the EPA limit 0.0150 mg/L Main supplier: HOLLISTER, CITY OF · 26,017 people · 2023 | 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 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 95023
| Supplier | State | Population 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, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.