What was found in ZIP 95928
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 | 6752.88 µg/L 68% of the EPA limit 10000 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 5235 µg/L 52% of the EPA limit 10000 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Nitrite | 195 µg/L 20% of the EPA limit 1000 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 152 µg/L 3040% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Fluoride | 108.5 µg/L 2.7% of the EPA limit 4000 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Barium | 40.2556 µg/L 2% of the EPA limit 2000 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Chromium | 11.8 µg/L 12% of the EPA limit 100 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Lithium | 11.7 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2024 | 1/1 | UCMR-5 |
| Xylenes, Total | 8.5 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| cis-1,2-Dichloroethylene | 6.081 µg/L 8.7% of the EPA limit 70 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| TTHM | 3.14 µg/L 3.9% of the EPA limit 80 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Arsenic | 2.1664 µg/L 22% of the EPA limit 10 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Toluene | 2.13 µg/L 0.2% of the EPA limit 1000 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Chloroform | 1.94 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Styrene | 1.575 µg/L 1.6% of the EPA limit 100 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 1.483 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 1.388 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Bromoform | 1.27 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 1.2 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Trichloroethylene | 1.175 µg/L 24% of the EPA limit 5 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Ethylbenzene | 1.1705 µg/L 0.2% of the EPA limit 700 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Copper | 0.9310 µg/L 0.1% of the EPA limit 1300 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 0.8988 µg/L 3% of the EPA limit 30 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2018 | 1/1 | SYR4 |
| Dichloromethane | 0.8500 µg/L 17% of the EPA limit 5 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Carbon Tetrachloride | 0.7200 µg/L 14% of the EPA limit 5 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| 1,1-Dichloroethylene | 0.5780 µg/L 8.3% of the EPA limit 7 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Selenium | 0.2114 µg/L 0.4% of the EPA limit 50 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0888 µg/L 0.6% of the EPA limit 15 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| PFOS | 0.0225 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2024 | 1/1 | UCMR-5 |
| PFHXS | 0.0221 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2024 | 1/1 | UCMR-5 |
| Antimony, Total | 0.0205 µg/L 0.3% of the EPA limit 6 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Cadmium | 0.0115 µg/L 0.2% of the EPA limit 5 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| PFBS | 0.0096 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2024 | 1/1 | UCMR-5 |
| PFOA | 0.0068 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2024 | 1/1 | UCMR-5 |
| Pfhxa | 0.0060 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2024 | 1/1 | UCMR-5 |
| Pfpea | 0.0053 µg/L No EPA limit set Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2024 | 1/1 | UCMR-5 |
| Beryllium, Total | 0.0020 µg/L 0.1% of the EPA limit 4 µg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2019 | 1/1 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CAL-WATER SERVICE CO.-CHICO · 114,925 people · 2023 | 1/1 | 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 95928
| Supplier | State | Population served |
|---|---|---|
| CAL-WATER SERVICE CO.-CHICO | CA | 114,925 |
Frequently asked questions about ZIP 95928 tap water
Is the tap water in ZIP 95928 safe to drink?
EPA testing detected 38 contaminants across the water suppliers serving ZIP 95928. 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 95928?
1 public water supplier report EPA drinking-water monitoring for ZIP 95928. Each is listed above with its population served.
What contaminants are in ZIP 95928's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Nitrite, Tetrachloroethylene, Fluoride, and others across this ZIP's suppliers. The full list with levels and sources is above.