What was found in ZIP 95403
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 |
|---|---|---|---|
| Fluoride | 244 µg/L 6.1% of the EPA limit 4000 µg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2015 | 2/2 | SYR4 |
| Barium | 62.34 µg/L 3.1% of the EPA limit 2000 µg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2015
Highest in the ZIP: 200 µg/L — CALIFORNIA-AMERICAN LARKFIELD (PUC) · 7,913 people · 2018 | 2/2 | SYR4 |
| Nitrate | 150 µg/L 1.5% of the EPA limit 10000 µg/L Highest in the ZIP: CALIFORNIA-AMERICAN LARKFIELD (PUC) · 7,913 people · 2019 | 1/2 | SYR4 |
| Lithium | 96 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2024 | 2/2 | UCMR-5 |
| 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 | 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 | 2/2 | SYR4 |
| Bromodichloromethane | 10.73 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 2/2 | SYR4 |
| Arsenic | 3.68 µg/L 37% of the EPA limit 10 µg/L Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2018
Highest in the ZIP: 10 µg/L — CALIFORNIA-AMERICAN LARKFIELD (PUC) · 7,913 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 8.625 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 7.189 pCi/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2015 | 1/2 | SYR4 |
| Trichloroacetic Acid | 5.81 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 5.4 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 3.12 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019 | 2/2 | SYR4 |
| Bromoform | 2.35 µg/L No EPA limit set Main supplier: SANTA ROSA, CITY OF · 175,396 people · 2019
Highest in the ZIP: 2.4 µg/L — CALIFORNIA-AMERICAN LARKFIELD (PUC) · 7,913 people · 2019 | 2/2 | 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 | 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 | 1/2 | 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: 0.0060 mg/L — CALIFORNIA-AMERICAN LARKFIELD (PUC) · 7,913 people · 2025 | 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 95403
| Supplier | State | Population served |
|---|---|---|
| SANTA ROSA, CITY OF | CA | 175,396 |
| CALIFORNIA-AMERICAN LARKFIELD (PUC) | CA | 7,913 |
Frequently asked questions about ZIP 95403 tap water
Is the tap water in ZIP 95403 safe to drink?
EPA testing detected 18 contaminants across the water suppliers serving ZIP 95403. 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 95403?
2 public water suppliers report EPA drinking-water monitoring for ZIP 95403. Each is listed above with its population served.
What contaminants are in ZIP 95403's water?
EPA monitoring detected Fluoride, Barium, Nitrate, Lithium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.