Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
5
health-based violations
7
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| TT | Health-based | Resolved | 2010-01-01 → 2010-01-31 |
| TT | Health-based | Resolved | 2010-01-01 → 2010-01-31 |
| TT | Health-based | Resolved | 2010-01-01 → 2010-01-31 |
| MCL | Health-based | Resolved | 1997-06-01 → 1997-06-30 |
| MCL | Health-based | Resolved | 1997-06-01 → 1997-06-30 |
| MON | Monitoring | Resolved | 2020-09-01 → 2020-09-30 |
| MON | Monitoring | Resolved | 2020-09-01 → 2020-09-30 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
Other contaminants detected
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 this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 12325 µg/L 123% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 14012 µg/L | 1316/1774 | SYR4 | 2012–2019 |
| Arsenic | 8.849 µg/L 88% of the EPA limit 10 µg/L
worst single sample: 10.8 µg/L | 495/908 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 540000 µg/L 5400% of the EPA limit, at the 95th percentile of samples — 10000 µg/L
worst single sample: 950000 µg/L | 455/680 | SYR4 | 2012–2019 |
| Bromodichloromethane | 17 µg/L No EPA limit set
worst single sample: 22.3 µg/L | 364/433 | SYR4 | 2012–2019 |
| TTHM | 56 µg/L 70% of the EPA limit 80 µg/L
worst single sample: 72.8 µg/L | 364/420 | SYR4 | 2012–2019 |
| Chloroform | 17 µg/L No EPA limit set
worst single sample: 40.5 µg/L | 362/431 | SYR4 | 2012–2019 |
| Dibromochloromethane | 18 µg/L No EPA limit set
worst single sample: 25 µg/L | 362/434 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 26 µg/L 43% of the EPA limit 60 µg/L
worst single sample: 49 µg/L | 349/360 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 14 µg/L No EPA limit set
worst single sample: 27 µg/L | 345/360 | SYR4 | 2012–2019 |
| Bromoform | 8.5 µg/L No EPA limit set
worst single sample: 25 µg/L | 321/434 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 5.84 µg/L No EPA limit set
worst single sample: 10 µg/L | 277/360 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 8.23 µg/L No EPA limit set
worst single sample: 11.6 µg/L | 198/360 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 3.885 µg/L No EPA limit set
worst single sample: 5.36 µg/L | 171/360 | SYR4 | 2012–2019 |
| Combined Uranium | 11.1303 µg/L 37% of the EPA limit 30 µg/L
worst single sample: 16.688 µg/L | 146/161 | SYR4 | 2012–2019 |
| Fluoride | 589.5 µg/L 15% of the EPA limit 4000 µg/L
worst single sample: 1580 µg/L | 124/135 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 27/27 | LCR | 2025 |
| Monochloroacetic Acid | 4.359 µg/L No EPA limit set
worst single sample: 5.09 µg/L | 27/360 | SYR4 | 2012–2019 |
| Lithium | 67.2 µg/L No EPA limit set | 18/24 | UCMR-5 | 2025 |
| Combined Radium (-226 And -228) | 0.6226 pCi/L 12% of the EPA limit 5 pCi/L
worst single sample: 0.6730 pCi/L | 17/17 | SYR4 | 2012–2013 |
| Selenium | 20.975 µg/L 42% of the EPA limit 50 µg/L
worst single sample: 21.5 µg/L | 16/151 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 4.488 pCi/L No EPA limit set
worst single sample: 5.43 pCi/L | 13/15 | SYR4 | 2012–2013 |
| Barium | 144.25 µg/L 7.2% of the EPA limit 2000 µg/L
worst single sample: 147 µg/L | 12/149 | SYR4 | 2012–2019 |
| Nitrite | 544 µg/L 54% of the EPA limit 1000 µg/L
worst single sample: 550 µg/L | 5/897 | SYR4 | 2012–2019 |
| Xylenes, Total | 21.2925 µg/L 0.2% of the EPA limit 10000 µg/L
worst single sample: 22.4 µg/L | 2/399 | SYR4 | 2012–2019 |
| Ethylbenzene | 9.05 µg/L 1.3% of the EPA limit 700 µg/L | 1/399 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 0.5000 µg/L 10% of the EPA limit 5 µg/L | 1/396 | SYR4 | 2012–2019 |
85 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCopperCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNetfosaaNfdhaNmefosaaOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Irvine Ranch Water District
Is Irvine Ranch Water District tap water safe to drink?
EPA monitoring detected 28 contaminants in Irvine Ranch Water District's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Irvine Ranch Water District's water?
EPA monitoring detected Nitrate, Arsenic, Nitrate-Nitrite, Bromodichloromethane, TTHM, and others. The full list with the level and data source for each is above.
How many people does Irvine Ranch Water District serve?
Irvine Ranch Water District reports serving 444,800 people in California, per its EPA record.
Has Irvine Ranch Water District had any water quality violations?
The EPA has 7 violations on file for Irvine Ranch Water District, of which 5 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.