What was found in ZIP 92404
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 | 6779.999999999995 µg/L 68% of the EPA limit 10000 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2018
Highest in the ZIP: 530000.0000000001 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Nitrate | 7900 µg/L 79% of the EPA limit 10000 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 10848 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Fluoride | 1275 µg/L 32% of the EPA limit 4000 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 2600 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Copper | 406 µg/L 31% of the EPA limit 1300 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| TTHM | 9 µg/L 11% of the EPA limit 80 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 78.66 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Lithium | 9.11 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2024
Highest in the ZIP: 56.2 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2025 | 2/2 | UCMR-5 |
| Combined Uranium | 27.3266 µg/L 91% of the EPA limit 30 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 42.24149999999999 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Lead | 40 µg/L 267% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| Chloroform | 1.7299999999999998 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 35.83999999999996 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 3.164999999999999 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 32.06999999999999 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 8.469999999999995 µg/L 14% of the EPA limit 60 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 28.869999999999997 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 2.5400000000000005 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 23.6 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Bromoform | 3.4549999999999983 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 19.305000000000003 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 18.22499999999999 µg/L No EPA limit set Highest in the ZIP: EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 1.1 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 13.6 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 1.8 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019
Highest in the ZIP: 12.429999999999996 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 8.809999999999999 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| Arsenic | 8.614999999999997 µg/L 86% of the EPA limit 10 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 2/2 | SYR4 |
| Tetrachloroethylene | 4.1 µg/L 82% of the EPA limit 5 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 2/2 | SYR4 |
| Chromium | 3.5 µg/L 3.5% of the EPA limit 100 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.555 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 2/2 | SYR4 |
| Trichloroethylene | 1.3 µg/L 26% of the EPA limit 5 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| cis-1,2-Dichloroethylene | 0.9435 µg/L 1.3% of the EPA limit 70 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| 1,1-Dichloroethylene | 0.7900 µg/L 11% of the EPA limit 7 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| Dichloromethane | 0.6465 µg/L 13% of the EPA limit 5 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| 1,2-Dichloropropane | 0.6170 µg/L 12% of the EPA limit 5 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| Carbon Tetrachloride | 0.2195 µg/L 4.4% of the EPA limit 5 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| Benzene | 0.1500 µg/L 3% of the EPA limit 5 µg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2019 | 1/2 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0120 µg/L 6% of the EPA limit 0.2000 µg/L Highest in the ZIP: EAST VALLEY WATER DISTRICT · 108,629 people · 2019 | 1/2 | SYR4 |
| PFOS | 0.0120 µg/L No EPA limit set Highest in the ZIP: EAST VALLEY WATER DISTRICT · 108,629 people · 2025 | 1/2 | UCMR-5 |
| PFOA | 0.0090 µg/L No EPA limit set Highest in the ZIP: EAST VALLEY WATER DISTRICT · 108,629 people · 2025 | 1/2 | UCMR-5 |
| PFBS | 0.0044 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2024
Highest in the ZIP: 0.0089 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2025 | 2/2 | UCMR-5 |
| Pfhxa | 0.0040 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2024
Highest in the ZIP: 0.0047 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2025 | 2/2 | UCMR-5 |
| Pfpea | 0.0034 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2024
Highest in the ZIP: 0.0047 µg/L — EAST VALLEY WATER DISTRICT · 108,629 people · 2025 | 2/2 | UCMR-5 |
| PFHXS | 0.0040 µg/L No EPA limit set Main supplier: SAN BERNARDINO CITY · 214,665 people · 2024 | 2/2 | UCMR-5 |
| Pfhpa | 0.0031 µg/L No EPA limit set Highest in the ZIP: EAST VALLEY WATER DISTRICT · 108,629 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: SAN BERNARDINO CITY · 214,665 people · 2024 | 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 92404
| Supplier | State | Population served |
|---|---|---|
| SAN BERNARDINO CITY | CA | 214,665 |
| EAST VALLEY WATER DISTRICT | CA | 108,629 |
Frequently asked questions about ZIP 92404 tap water
Is the tap water in ZIP 92404 safe to drink?
EPA testing detected 37 contaminants across the water suppliers serving ZIP 92404. 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 92404?
2 public water suppliers report EPA drinking-water monitoring for ZIP 92404. Each is listed above with its population served.
What contaminants are in ZIP 92404's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Copper, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.