What was found in ZIP 95203
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-Nitrite | 8270 µg/L 83% of the EPA limit 10000 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Nitrate | 7751 µg/L 78% of the EPA limit 10000 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Barium | 230 µg/L 12% of the EPA limit 2000 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Fluoride | 134.5 µg/L 3.4% of the EPA limit 4000 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| TTHM | 66.81 µg/L 84% of the EPA limit 80 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Chloroform | 56.809 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 26 µg/L 43% of the EPA limit 60 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Arsenic | 23.8416 µg/L 238% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 16.05 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 12.95 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 9.1 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Chromium | 8.8498 µg/L 8.8% of the EPA limit 100 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Copper | 8.1892 µg/L 0.6% of the EPA limit 1300 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 5.97073 µg/L 20% of the EPA limit 30 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 5.5315 pCi/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Trichloroethylene | 4.62 µg/L 92% of the EPA limit 5 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 2.679 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 2.575 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 1.659 µg/L 33% of the EPA limit 5 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Xylenes, Total | 1.3 µg/L 0% of the EPA limit 10000 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Lead | 1.21485 µg/L 8.1% of the EPA limit 15 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 1.1 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Bromoform | 0.9900 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Selenium | 0.8876 µg/L 1.8% of the EPA limit 50 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| 1,2-Dichloropropane | 0.6035 µg/L 12% of the EPA limit 5 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Cadmium | 0.1600 µg/L 3.2% of the EPA limit 5 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Antimony, Total | 0.1350 µg/L 2.3% of the EPA limit 6 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Mercury | 0.0460 µg/L 2.3% of the EPA limit 2 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Thallium, Total | 0.0442 µg/L 2.2% of the EPA limit 2 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| Beryllium, Total | 0.0261 µg/L 0.7% of the EPA limit 4 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2019 | 1/1 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0100 µg/L 5% of the EPA limit 0.2000 µg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2018 | 1/1 | SYR4 |
| PFOS | 0.0052 µg/L No EPA limit set Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: CALIFORNIA WATER SERVICE - STOCKTON · 176,266 people · 2024 | 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 95203
| Supplier | State | Population served |
|---|---|---|
| CALIFORNIA WATER SERVICE - STOCKTON | CA | 176,266 |
Frequently asked questions about ZIP 95203 tap water
Is the tap water in ZIP 95203 safe to drink?
EPA testing detected 33 contaminants across the water suppliers serving ZIP 95203. 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 95203?
1 public water supplier report EPA drinking-water monitoring for ZIP 95203. Each is listed above with its population served.
What contaminants are in ZIP 95203's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Barium, Fluoride, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.