What was found in Santa Rosa'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 | 7500 µg/L 75% of the EPA limit 10000 µg/L | 22/37 | SYR4 |
| Barium | 430 µg/L 22% of the EPA limit 2000 µg/L | 18/37 | SYR4 |
| Fluoride | 410 µg/L 10% of the EPA limit 4000 µg/L | 27/37 | SYR4 |
| Copper | 180 µg/L 14% of the EPA limit 1300 µg/L | 7/37 | SYR4 |
| Total Haloacetic Acids (HAA5) | 180 µg/L 300% of the EPA limit, in the worst sample — 60 µg/L | 27/37 | SYR4 |
| TTHM | 170 µg/L 213% of the EPA limit, in the worst sample — 80 µg/L | 23/37 | SYR4 |
| Chloroform | 140 µg/L No EPA limit set | 15/37 | SYR4 |
| Trichloroacetic Acid | 121 µg/L No EPA limit set | 12/37 | SYR4 |
| Lithium | 96 µg/L No EPA limit set | 1/37 | UCMR-5 |
| Dichloroacetic Acid | 73 µg/L No EPA limit set | 16/37 | SYR4 |
| Bromodichloromethane | 35 µg/L No EPA limit set | 17/37 | SYR4 |
| Arsenic | 31 µg/L 310% of the EPA limit, in the worst sample — 10 µg/L | 18/37 | SYR4 |
| Dibromochloromethane | 24 µg/L No EPA limit set | 22/37 | SYR4 |
| Trichloroethylene | 18 µg/L 360% of the EPA limit, in the worst sample — 5 µg/L | 2/37 | SYR4 |
| Dibromoacetic Acid | 13.03 µg/L No EPA limit set | 22/37 | SYR4 |
| Monochloroacetic Acid | 12.8 µg/L No EPA limit set | 12/37 | SYR4 |
| Toluene | 12.24 µg/L 1.2% of the EPA limit 1000 µg/L | 4/37 | SYR4 |
| Monobromoacetic Acid | 12 µg/L No EPA limit set | 3/37 | SYR4 |
| Bromoform | 11 µg/L No EPA limit set | 17/37 | SYR4 |
| Chromium | 11 µg/L 11% of the EPA limit 100 µg/L | 10/37 | SYR4 |
| Gross Beta Particle Activity | 7.42 pCi/L No EPA limit set | 1/37 | SYR4 |
| 1,1-Dichloroethylene | 5.5 µg/L 79% of the EPA limit 7 µg/L | 1/37 | SYR4 |
| Asbestos | 2.1 MFL 30% of the EPA limit 7 MFL | 3/37 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.26990017 pCi/L 8.5% of the EPA limit 15 pCi/L | 1/37 | SYR4 |
| Nitrite | 0.7500 µg/L 0.1% of the EPA limit 1000 µg/L | 1/37 | SYR4 |
| Benzo(A)Pyrene | 0.1500 µg/L 75% of the EPA limit 0.2000 µg/L | 1/37 | SYR4 |
| Lead | 0.0080 mg/L 53% of the EPA limit 0.0150 mg/L | 35/37 | LCR |
Water suppliers serving Santa Rosa
Frequently asked questions about Santa Rosa tap water
Is Santa Rosa tap water safe to drink?
EPA testing detected 27 contaminants in the water serving Santa Rosa. 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 Santa Rosa?
37 public water suppliers report drinking-water monitoring for Santa Rosa, California to the EPA. Each is listed above with its population served.
What contaminants are in Santa Rosa's water?
The contaminants EPA monitoring detected in Santa Rosa include Nitrate, Barium, Fluoride, Copper, Total Haloacetic Acids (HAA5). 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.