What was found in ZIP 92504
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 | 359550 µg/L 3596% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2018 | 2/3 | SYR4 |
| Nitrate | 10170 µg/L 102% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 2/3 | SYR4 |
| Fluoride | 750 µg/L 19% of the EPA limit 4000 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019
Highest in the ZIP: 1100 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2019 | 2/3 | SYR4 |
| Copper | 135.75 µg/L 10% of the EPA limit 1300 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019
Highest in the ZIP: 456 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2019 | 2/3 | SYR4 |
| Barium | 65 µg/L 3.3% of the EPA limit 2000 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019
Highest in the ZIP: 186 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2019 | 2/3 | SYR4 |
| Nitrite | 95.0125 µg/L 9.5% of the EPA limit 1000 µg/L Highest in the ZIP: ELSINORE VALLEY MWD · 169,455 people · 2019 | 1/3 | SYR4 |
| TTHM | 5.6 µg/L 7% of the EPA limit 80 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019
Highest in the ZIP: 50.45 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2019 | 3/3 | SYR4 |
| Combined Uranium | 41.72 µg/L 139% of the EPA limit, at the 95th percentile of samples — 30 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 2/3 | SYR4 |
| Lithium | 9.1 µg/L No EPA limit set Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2023
Highest in the ZIP: 39 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2025 | 3/3 | UCMR-5 |
| Monochloroacetic Acid | 32.7 µg/L No EPA limit set Highest in the ZIP: WESTERN MWD · 86,062 people · 2019 | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 30.4 µg/L 51% of the EPA limit 60 µg/L Highest in the ZIP: ELSINORE VALLEY MWD · 169,455 people · 2019 | 2/3 | SYR4 |
| Arsenic | 8 µg/L 80% of the EPA limit 10 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019
Highest in the ZIP: 25 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2019 | 2/3 | SYR4 |
| Dibromochloromethane | 2.9 µg/L No EPA limit set Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019
Highest in the ZIP: 18 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 1.97 µg/L No EPA limit set Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019
Highest in the ZIP: 17 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2019 | 3/3 | SYR4 |
| Selenium | 16 µg/L 32% of the EPA limit 50 µg/L Highest in the ZIP: ELSINORE VALLEY MWD · 169,455 people · 2019 | 1/3 | SYR4 |
| Bromoform | 2.9 µg/L No EPA limit set Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019
Highest in the ZIP: 13.7 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2019 | 3/3 | SYR4 |
| Chloroform | 9.732 µg/L No EPA limit set Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019
Highest in the ZIP: 13 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 13 µg/L No EPA limit set Highest in the ZIP: ELSINORE VALLEY MWD · 169,455 people · 2019 | 2/3 | SYR4 |
| Gross Beta Particle Activity | 13 pCi/L No EPA limit set Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 2/3 | SYR4 |
| Trichloroethylene | 11 µg/L 220% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 1/3 | SYR4 |
| Chromium | 10.55 µg/L 11% of the EPA limit 100 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 2/3 | SYR4 |
| Trichloroacetic Acid | 10.3 µg/L No EPA limit set Highest in the ZIP: ELSINORE VALLEY MWD · 169,455 people · 2019 | 2/3 | SYR4 |
| Lead | 8.355 µg/L 56% of the EPA limit 15 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 2/3 | SYR4 |
| Dibromoacetic Acid | 1.7 µg/L No EPA limit set Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019
Highest in the ZIP: 7.025 µg/L — ELSINORE VALLEY MWD · 169,455 people · 2019 | 3/3 | SYR4 |
| Monobromoacetic Acid | 5.85 µg/L No EPA limit set Highest in the ZIP: ELSINORE VALLEY MWD · 169,455 people · 2019 | 2/3 | SYR4 |
| Picloram | 4.95 µg/L 1% of the EPA limit 500 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 4.005 pCi/L 80% of the EPA limit 5 pCi/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 1/3 | SYR4 |
| 1,1-Dichloroethylene | 2.3 µg/L 33% of the EPA limit 7 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 1/3 | SYR4 |
| Dichloromethane | 1.905 µg/L 38% of the EPA limit 5 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 2/3 | SYR4 |
| Tetrachloroethylene | 1.0915 µg/L 22% of the EPA limit 5 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 1/3 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.2900 µg/L 145% of the EPA limit, at the 95th percentile of samples — 0.2000 µg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2019 | 1/3 | SYR4 |
| Pfba | 0.0070 µg/L No EPA limit set Highest in the ZIP: ELSINORE VALLEY MWD · 169,455 people · 2025 | 1/3 | UCMR-5 |
| Pfpea | 0.0067 µg/L No EPA limit set Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2023 | 2/3 | UCMR-5 |
| Pfhxa | 0.0041 µg/L No EPA limit set Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2023 | 1/3 | UCMR-5 |
| PFOS | 0.0040 µg/L No EPA limit set Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2023 | 1/3 | UCMR-5 |
| PFHXS | 0.0034 µg/L No EPA limit set Highest in the ZIP: WESTERN MWD · 86,062 people · 2023 | 1/3 | UCMR-5 |
| PFBS | 0.0030 µg/L No EPA limit set Highest in the ZIP: WESTERN MWD · 86,062 people · 2023 | 1/3 | UCMR-5 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: RIVERSIDE, CITY OF · 298,398 people · 2025
Highest in the ZIP: 0.0013 mg/L — ELSINORE VALLEY MWD · 169,455 people · 2025 | 3/3 | 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 92504
| Supplier | State | Population served |
|---|---|---|
| RIVERSIDE, CITY OF | CA | 298,398 |
| ELSINORE VALLEY MWD | CA | 169,455 |
| WESTERN MWD | CA | 86,062 |
Frequently asked questions about ZIP 92504 tap water
Is the tap water in ZIP 92504 safe to drink?
EPA testing detected 38 contaminants across the water suppliers serving ZIP 92504. 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 92504?
3 public water suppliers report EPA drinking-water monitoring for ZIP 92504. Each is listed above with its population served.
What contaminants are in ZIP 92504's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Copper, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.