What was found in ZIP 95404
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 | 1000 µg/L 10% of the EPA limit 10000 µg/L Highest in the ZIP: KOHALA RANCH WATER CO. · 850 people · 2019 | 1/2 | SYR4 |
| Nitrate-Nitrite | 1000 µg/L 10% of the EPA limit 10000 µg/L Highest in the ZIP: KOHALA RANCH WATER CO. · 850 people · 2019 | 1/2 | SYR4 |
| Copper | 1.98 µg/L 0.2% of the EPA limit 1300 µg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2018
Highest in the ZIP: 382.55 µg/L — KOHALA RANCH WATER CO. · 850 people · 2019 | 2/2 | SYR4 |
| Fluoride | 244 µg/L 6.1% of the EPA limit 4000 µg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2015 | 1/2 | SYR4 |
| Lead | 117.19 µg/L 781% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the ZIP: KOHALA RANCH WATER CO. · 850 people · 2019 | 1/2 | SYR4 |
| Lithium | 96 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2024 | 1/2 | UCMR-5 |
| Barium | 62.34 µg/L 3.1% of the EPA limit 2000 µg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2015 | 1/2 | SYR4 |
| TTHM | 36.54 µg/L 46% of the EPA limit 80 µg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 2/2 | SYR4 |
| Chloroform | 20.415 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 1/2 | SYR4 |
| Bromoform | 2.35 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019
Highest in the ZIP: 16.875 µg/L — KOHALA RANCH WATER CO. · 850 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11 µg/L 18% of the EPA limit 60 µg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 10.73 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 1/2 | SYR4 |
| Dibromochloromethane | 8.625 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 1/2 | SYR4 |
| Gross Beta Particle Activity | 7.189 pCi/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2015 | 2/2 | SYR4 |
| Trichloroacetic Acid | 5.81 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 5.4 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.4 pCi/L 29% of the EPA limit 15 pCi/L Highest in the ZIP: KOHALA RANCH WATER CO. · 850 people · 2019 | 1/2 | SYR4 |
| Arsenic | 3.68 µg/L 37% of the EPA limit 10 µg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2018 | 1/2 | SYR4 |
| Dibromoacetic Acid | 3.12 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 1/2 | SYR4 |
| Chromium | 0.6200 µg/L 0.6% of the EPA limit 100 µg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2015
Highest in the ZIP: 2.1495 µg/L — KOHALA RANCH WATER CO. · 850 people · 2019 | 2/2 | SYR4 |
| Lead | 0.0013 mg/L 8.8% of the EPA limit 0.0150 mg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2025
Highest in the ZIP: 0.0107 mg/L — KOHALA RANCH WATER CO. · 850 people · 2021 | 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 95404
| Supplier | State | Population served |
|---|---|---|
| SANTA ROSA, CITY OF | CA | 175,396 |
| KOHALA RANCH WATER CO. | HI | 850 |
Frequently asked questions about ZIP 95404 tap water
Is the tap water in ZIP 95404 safe to drink?
EPA testing detected 21 contaminants across the water suppliers serving ZIP 95404. 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 95404?
2 public water suppliers report EPA drinking-water monitoring for ZIP 95404. Each is listed above with its population served.
What contaminants are in ZIP 95404's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Copper, Fluoride, Lead, and others across this ZIP's suppliers. The full list with levels and sources is above.