What was found in Hollister's water
The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate-Nitrite | 700000 µg/L 7000% of the EPA limit, in the worst sample — 10000 µg/L | 18/20 | SYR4 |
| Nitrate | 17800 µg/L 178% of the EPA limit, in the worst sample — 10000 µg/L | 19/20 | SYR4 |
| Copper | 1100 µg/L 85% of the EPA limit 1300 µg/L | 7/20 | SYR4 |
| Fluoride | 520 µg/L 13% of the EPA limit 4000 µg/L | 19/20 | SYR4 |
| Barium | 420 µg/L 21% of the EPA limit 2000 µg/L | 12/20 | SYR4 |
| Nitrite | 400 µg/L 40% of the EPA limit 1000 µg/L | 5/20 | SYR4 |
| Arsenic | 200 µg/L 2000% of the EPA limit, in the worst sample — 10 µg/L | 16/20 | SYR4 |
| TTHM | 161.8 µg/L 202% of the EPA limit, in the worst sample — 80 µg/L | 18/20 | SYR4 |
| Bromoform | 105.05 µg/L No EPA limit set | 17/20 | SYR4 |
| Dibromochloromethane | 77.57 µg/L No EPA limit set | 13/20 | SYR4 |
| Combined Uranium | 46.19 µg/L 154% of the EPA limit, in the worst sample — 30 µg/L | 10/20 | SYR4 |
| Chromium | 41 µg/L 41% of the EPA limit 100 µg/L | 11/20 | SYR4 |
| Total Haloacetic Acids (HAA5) | 35.4 µg/L 59% of the EPA limit 60 µg/L | 13/20 | SYR4 |
| Lead | 35 µg/L 233% of the EPA limit, in the worst sample — 15 µg/L | 2/20 | SYR4 |
| Bromodichloromethane | 34.37 µg/L No EPA limit set | 13/20 | SYR4 |
| Lithium | 29 µg/L No EPA limit set | 2/20 | UCMR-5 |
| Asbestos | 27 MFL 386% of the EPA limit, in the worst sample — 7 MFL | 1/20 | SYR4 |
| Dibromoacetic Acid | 21.1 µg/L No EPA limit set | 17/20 | SYR4 |
| Dichloroacetic Acid | 12.2 µg/L No EPA limit set | 9/20 | SYR4 |
| Chloroform | 10 µg/L No EPA limit set | 9/20 | SYR4 |
| Selenium | 9.1 µg/L 18% of the EPA limit 50 µg/L | 9/20 | SYR4 |
| Gross Beta Particle Activity | 8.3 pCi/L No EPA limit set | 1/20 | SYR4 |
| Trichloroacetic Acid | 7.1 µg/L No EPA limit set | 7/20 | SYR4 |
| Monochloroacetic Acid | 4.5 µg/L No EPA limit set | 2/20 | SYR4 |
| Combined Radium (-226 And -228) | 3.88 pCi/L 78% of the EPA limit 5 pCi/L | 3/20 | SYR4 |
| Monobromoacetic Acid | 3 µg/L No EPA limit set | 5/20 | SYR4 |
| Toluene | 2.3 µg/L 0.2% of the EPA limit 1000 µg/L | 2/20 | SYR4 |
| Antimony, Total | 2 µg/L 33% of the EPA limit 6 µg/L | 1/20 | SYR4 |
| Cadmium | 0.5000 µg/L 10% of the EPA limit 5 µg/L | 1/20 | SYR4 |
| Lead | 0.0453 mg/L 302% above the EPA limit of 0.0150 mg/L | 19/20 | LCR |
| PFOA | 0.0046 µg/L No EPA limit set | 1/20 | UCMR-5 |
Water suppliers serving Hollister
Frequently asked questions about Hollister tap water
Is Hollister tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Hollister. 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 Hollister?
20 public water suppliers report drinking-water monitoring for Hollister, California to the EPA. Each is listed above with its population served.
What contaminants are in Hollister's water?
The contaminants EPA monitoring detected in Hollister include Nitrate-Nitrite, Nitrate, Copper, Fluoride, Barium. 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.