What was found in Paso Robles'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 | 980000 µg/L 9800% of the EPA limit, in the worst sample — 10000 µg/L | 6/10 | SYR4 |
| Nitrate | 7232 µg/L 72% of the EPA limit 10000 µg/L | 8/10 | SYR4 |
| Fluoride | 3500 µg/L 88% of the EPA limit 4000 µg/L | 9/10 | SYR4 |
| Barium | 330 µg/L 17% of the EPA limit 2000 µg/L | 4/10 | SYR4 |
| Selenium | 230 µg/L 460% of the EPA limit, in the worst sample — 50 µg/L | 8/10 | SYR4 |
| Total Haloacetic Acids (HAA5) | 128 µg/L 213% of the EPA limit, in the worst sample — 60 µg/L | 4/10 | SYR4 |
| TTHM | 87.2 µg/L 109% of the EPA limit, in the worst sample — 80 µg/L | 4/10 | SYR4 |
| Trichloroacetic Acid | 72 µg/L No EPA limit set | 3/10 | SYR4 |
| Chloroform | 68.5 µg/L No EPA limit set | 3/10 | SYR4 |
| Copper | 60 µg/L 4.6% of the EPA limit 1300 µg/L | 2/10 | SYR4 |
| Dichloroacetic Acid | 56 µg/L No EPA limit set | 3/10 | SYR4 |
| Lithium | 46.2 µg/L No EPA limit set | 1/10 | UCMR-5 |
| Bromoform | 41 µg/L No EPA limit set | 4/10 | SYR4 |
| Arsenic | 36 µg/L 360% of the EPA limit, in the worst sample — 10 µg/L | 7/10 | SYR4 |
| Dibromochloromethane | 30 µg/L No EPA limit set | 4/10 | SYR4 |
| Bromodichloromethane | 19 µg/L No EPA limit set | 3/10 | SYR4 |
| Combined Uranium | 18.178 µg/L 61% of the EPA limit 30 µg/L | 5/10 | SYR4 |
| Dibromoacetic Acid | 13.2 µg/L No EPA limit set | 4/10 | SYR4 |
| Lead | 7.1 µg/L 47% of the EPA limit 15 µg/L | 1/10 | SYR4 |
| Cadmium | 5.1 µg/L 102% of the EPA limit, in the worst sample — 5 µg/L | 1/10 | SYR4 |
| Monochloroacetic Acid | 3.5 µg/L No EPA limit set | 2/10 | SYR4 |
| Monobromoacetic Acid | 2.1 µg/L No EPA limit set | 2/10 | SYR4 |
| Chromium | 1 µg/L 1% of the EPA limit 100 µg/L | 1/10 | SYR4 |
| Combined Radium (-226 And -228) | 0.8780 pCi/L 18% of the EPA limit 5 pCi/L | 1/10 | SYR4 |
| Thallium, Total | 0.2000 µg/L 10% of the EPA limit 2 µg/L | 1/10 | SYR4 |
| Pfpea | 0.0220 µg/L No EPA limit set | 1/10 | UCMR-5 |
| Pfhxa | 0.0200 µg/L No EPA limit set | 1/10 | UCMR-5 |
| PFBS | 0.0081 µg/L No EPA limit set | 1/10 | UCMR-5 |
| Lead | 0.0066 mg/L 44% of the EPA limit 0.0150 mg/L | 10/10 | LCR |
| Pfhpa | 0.0063 µg/L No EPA limit set | 1/10 | UCMR-5 |
| PFOA | 0.0063 µg/L No EPA limit set | 1/10 | UCMR-5 |
| Pfba | 0.0061 µg/L No EPA limit set | 1/10 | UCMR-5 |
| PFHXS | 0.0052 µg/L No EPA limit set | 1/10 | UCMR-5 |
Water suppliers serving Paso Robles
| Supplier | Population served |
|---|---|
| CITY OF PASO ROBLES WATER DIVISION | 31,176 |
| HERITAGE RANCH CSD | 2,956 |
| WALNUT HILLS MUTUAL WATER CO | 486 |
| LOS ROBLES MOBILE HOME ESTATES | 420 |
| GREEN RIVER MUTUAL WATER CO. | 350 |
| RESTHAVEN MOBILE HOME PARK | 99 |
| RANCHO SALINAS MBWC | 50 |
| ALMIRA WATER ASSOCIATION | 40 |
| MUSTANG SPRINGS MUTUAL WATER | 30 |
| ADA'S LODGES | 25 |
Frequently asked questions about Paso Robles tap water
Is Paso Robles tap water safe to drink?
EPA testing detected 33 contaminants in the water serving Paso Robles. 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 Paso Robles?
10 public water suppliers report drinking-water monitoring for Paso Robles, California to the EPA. Each is listed above with its population served.
What contaminants are in Paso Robles's water?
The contaminants EPA monitoring detected in Paso Robles include Nitrate-Nitrite, Nitrate, Fluoride, Barium, Selenium. 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.