What was found in ZIP 92831
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 | 4791.2 µg/L 48% of the EPA limit 10000 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 4201 µg/L 42% of the EPA limit 10000 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Fluoride | 611 µg/L 15% of the EPA limit 4000 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| TTHM | 46.529999999999994 µg/L 58% of the EPA limit 80 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Lithium | 34.9834 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2025 | 1/1 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 19.670999999999985 µg/L 33% of the EPA limit 60 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 15.664999999999997 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Chloroform | 15.22999999999995 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 14.164999999999997 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 12.011635000000004 µg/L 40% of the EPA limit 30 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2018 | 1/1 | SYR4 |
| Dichloroacetic Acid | 10.661999999999995 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Selenium | 9.98 µg/L 20% of the EPA limit 50 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Bromoform | 7.9 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 7.087999999999997 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 6.675999999999999 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 5.015999999999999 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Arsenic | 2 µg/L 20% of the EPA limit 10 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 2 µg/L 40% of the EPA limit 5 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| Trichloroethylene | 2 µg/L 40% of the EPA limit 5 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| 1,1-Dichloroethylene | 1.7699999999999996 µg/L 25% of the EPA limit 7 µg/L Main supplier: CITY OF FULLERTON · 139,461 people · 2019 | 1/1 | SYR4 |
| PFOS | 0.0133 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2025 | 1/1 | UCMR-5 |
| Pfpea | 0.0132 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2025 | 1/1 | UCMR-5 |
| Pfhxa | 0.0124 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2025 | 1/1 | UCMR-5 |
| PFOA | 0.0108 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2025 | 1/1 | UCMR-5 |
| PFBS | 0.0076 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2025 | 1/1 | UCMR-5 |
| PFHXS | 0.0062 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2025 | 1/1 | UCMR-5 |
| Pfba | 0.0059 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2025 | 1/1 | UCMR-5 |
| Pfhpa | 0.0048 µg/L No EPA limit set Main supplier: CITY OF FULLERTON · 139,461 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0015 mg/L 10% of the EPA limit 0.0150 mg/L Main supplier: CITY OF FULLERTON · 139,461 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 92831
| Supplier | State | Population served |
|---|---|---|
| CITY OF FULLERTON | CA | 139,461 |
Frequently asked questions about ZIP 92831 tap water
Is the tap water in ZIP 92831 safe to drink?
EPA testing detected 29 contaminants across the water suppliers serving ZIP 92831. 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 92831?
1 public water supplier report EPA drinking-water monitoring for ZIP 92831. Each is listed above with its population served.
What contaminants are in ZIP 92831's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, TTHM, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.