What was found in ZIP 92603
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 | 540000 µg/L 5400% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Nitrate | 12325 µg/L 123% of the EPA limit, at the 95th percentile of samples — 10000 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Fluoride | 589.5 µg/L 15% of the EPA limit 4000 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Nitrite | 544 µg/L 54% of the EPA limit 1000 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Barium | 144.25 µg/L 7.2% of the EPA limit 2000 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Lithium | 67.2 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2025 | 1/1 | UCMR-5 |
| TTHM | 56 µg/L 70% of the EPA limit 80 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 26 µg/L 43% of the EPA limit 60 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Xylenes, Total | 21.2925 µg/L 0.2% of the EPA limit 10000 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Selenium | 20.975 µg/L 42% of the EPA limit 50 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 18 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 17 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Chloroform | 17 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 14 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 11.1303 µg/L 37% of the EPA limit 30 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Ethylbenzene | 9.05 µg/L 1.3% of the EPA limit 700 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Arsenic | 8.849 µg/L 88% of the EPA limit 10 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Bromoform | 8.5 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Trichloroacetic Acid | 8.23 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 5.84 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 4.488 pCi/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2013 | 1/1 | SYR4 |
| Monochloroacetic Acid | 4.359 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 3.885 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 0.6226 pCi/L 12% of the EPA limit 5 pCi/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2013 | 1/1 | SYR4 |
| Tetrachloroethylene | 0.5000 µg/L 10% of the EPA limit 5 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/1 | SYR4 |
| Pfba | 0.0079 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2025 | 1/1 | UCMR-5 |
| Pfpea | 0.0038 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2025 | 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 92603
| Supplier | State | Population served |
|---|---|---|
| IRVINE RANCH WATER DISTRICT | CA | 444,800 |
Frequently asked questions about ZIP 92603 tap water
Is the tap water in ZIP 92603 safe to drink?
EPA testing detected 28 contaminants across the water suppliers serving ZIP 92603. 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 92603?
1 public water supplier report EPA drinking-water monitoring for ZIP 92603. Each is listed above with its population served.
What contaminants are in ZIP 92603's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Nitrite, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.