What was found in ZIP 92679
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 | 2/4 | 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 | 3/4 | SYR4 |
| Fluoride | 589.5 µg/L 15% of the EPA limit 4000 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 2/4 | SYR4 |
| Nitrite | 544 µg/L 54% of the EPA limit 1000 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/4 | SYR4 |
| Copper | 382.55 µg/L 29% of the EPA limit 1300 µg/L Highest in the ZIP: KOHALA RANCH WATER CO. · 850 people · 2019 | 1/4 | 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 | 2/4 | SYR4 |
| Lead | 117.19 µg/L 781% of the EPA limit, at the 95th percentile of samples — 15 µg/L Highest in the ZIP: KOHALA RANCH WATER CO. · 850 people · 2019 | 1/4 | SYR4 |
| TTHM | 56 µg/L 70% of the EPA limit 80 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019
Highest in the ZIP: 70.97 µg/L — TRABUCO CANYON WATER DISTRICT · 13,659 people · 2019 | 4/4 | SYR4 |
| Lithium | 67.2 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2025 | 3/4 | UCMR-5 |
| Chloroform | 17 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019
Highest in the ZIP: 31.3 µg/L — TRABUCO CANYON WATER DISTRICT · 13,659 people · 2019 | 3/4 | 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 | 3/4 | 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 | 1/4 | SYR4 |
| Bromodichloromethane | 17 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019
Highest in the ZIP: 21.115 µg/L — TRABUCO CANYON WATER DISTRICT · 13,659 people · 2019 | 3/4 | SYR4 |
| Selenium | 20.975 µg/L 42% of the EPA limit 50 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 2/4 | SYR4 |
| Dibromochloromethane | 18 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019
Highest in the ZIP: 18.215 µg/L — TRABUCO CANYON WATER DISTRICT · 13,659 people · 2019 | 3/4 | SYR4 |
| Bromoform | 8.5 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019
Highest in the ZIP: 16.875 µg/L — KOHALA RANCH WATER CO. · 850 people · 2019 | 4/4 | SYR4 |
| Dichloroacetic Acid | 14 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 3/4 | 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 | 2/4 | 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 | 1/4 | SYR4 |
| Arsenic | 8.849 µg/L 88% of the EPA limit 10 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/4 | SYR4 |
| Trichloroacetic Acid | 8.23 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 5.84 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 3/4 | SYR4 |
| Gross Beta Particle Activity | 4.488 pCi/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2013
Highest in the ZIP: 5.74 pCi/L — KOHALA RANCH WATER CO. · 850 people · 2019 | 2/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 4.4 pCi/L 29% of the EPA limit 15 pCi/L Highest in the ZIP: KOHALA RANCH WATER CO. · 850 people · 2019 | 1/4 | SYR4 |
| Monochloroacetic Acid | 4.359 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 2/4 | SYR4 |
| Monobromoacetic Acid | 3.885 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 3/4 | SYR4 |
| Chromium | 2.1495 µg/L 2.1% of the EPA limit 100 µg/L Highest in the ZIP: KOHALA RANCH WATER CO. · 850 people · 2019 | 1/4 | 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 | 1/4 | SYR4 |
| Tetrachloroethylene | 0.5000 µg/L 10% of the EPA limit 5 µg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2025
Highest in the ZIP: 0.0107 mg/L — KOHALA RANCH WATER CO. · 850 people · 2021 | 4/4 | LCR |
| Pfba | 0.0079 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2025 | 1/4 | UCMR-5 |
| Pfpea | 0.0038 µg/L No EPA limit set Main supplier: IRVINE RANCH WATER DISTRICT · 444,800 people · 2025 | 1/4 | UCMR-5 |
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 92679
| Supplier | State | Population served |
|---|---|---|
| IRVINE RANCH WATER DISTRICT | CA | 444,800 |
| SANTA MARGARITA WATER DISTRICT | CA | 168,289 |
| TRABUCO CANYON WATER DISTRICT | CA | 13,659 |
| KOHALA RANCH WATER CO. | HI | 850 |
Frequently asked questions about ZIP 92679 tap water
Is the tap water in ZIP 92679 safe to drink?
EPA testing detected 32 contaminants across the water suppliers serving ZIP 92679. 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 92679?
4 public water suppliers report EPA drinking-water monitoring for ZIP 92679. Each is listed above with its population served.
What contaminants are in ZIP 92679's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Nitrite, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.