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.
4
health-based violations
17
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2011-01-01 → 2011-01-31 |
| MCL | Health-based | Resolved | 2011-01-01 → 2011-01-31 |
| MCL | Health-based | Resolved | 2011-01-01 → 2011-01-31 |
| MCL | Health-based | Resolved | 2011-01-01 → 2011-01-31 |
| MR | Monitoring | Resolved | 2016-01-01 → 2016-03-31 |
| MR | Monitoring | Resolved | 2016-01-01 → 2016-03-31 |
| MR | Monitoring | Resolved | 2016-01-01 → 2016-03-31 |
| MR | Monitoring | Resolved | 2016-01-01 → 2016-03-31 |
| MR | Monitoring | Resolved | 2016-01-01 → 2016-03-31 |
| MR | Monitoring | Resolved | 2016-01-01 → 2016-03-31 |
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 |
|---|---|---|---|---|
| TTHM | 33.86 µg/L 42% of the EPA limit 80 µg/L
worst single sample: 76.24 µg/L | 518/518 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 31.815 µg/L 53% of the EPA limit 60 µg/L
worst single sample: 56.6 µg/L | 518/518 | SYR4 | 2012–2019 |
| Chlorite | 630 µg/L 63% of the EPA limit 1000 µg/L
worst single sample: 840 µg/L | 224/228 | SYR4 | 2012–2019 |
| Bromodichloromethane | 8.92 µg/L No EPA limit set
worst single sample: 11.4 µg/L | 91/91 | SYR4 | 2012–2019 |
| Chloroform | 24.175 µg/L No EPA limit set
worst single sample: 35.3 µg/L | 90/91 | SYR4 | 2012–2019 |
| Dibromochloromethane | 10.2 µg/L No EPA limit set
worst single sample: 11.5 µg/L | 90/91 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 5.5675 µg/L No EPA limit set
worst single sample: 6.29 µg/L | 86/86 | SYR4 | 2018–2019 |
| Dichloroacetic Acid | 19.25 µg/L No EPA limit set
worst single sample: 25.4 µg/L | 86/86 | SYR4 | 2018–2019 |
| Trichloroacetic Acid | 10.4 µg/L No EPA limit set
worst single sample: 13.7 µg/L | 84/86 | SYR4 | 2018–2019 |
| Bromoform | 4.799 µg/L No EPA limit set
worst single sample: 5.19 µg/L | 64/91 | SYR4 | 2012–2019 |
| Fluoride | 974.5 µg/L 24% of the EPA limit 4000 µg/L
worst single sample: 1070 µg/L | 38/38 | SYR4 | 2012–2019 |
| Nitrate | 1212.5 µg/L 12% of the EPA limit 10000 µg/L
worst single sample: 1250 µg/L | 36/94 | SYR4 | 2012–2019 |
| Barium | 56.72 µg/L 2.8% of the EPA limit 2000 µg/L
worst single sample: 58.7 µg/L | 19/19 | SYR4 | 2012–2019 |
| Lead | 0.0025 mg/L 17% of the EPA limit 0.0150 mg/L | 19/19 | LCR | 2025 |
| Nitrate-Nitrite | 1167.5 µg/L 12% of the EPA limit 10000 µg/L
worst single sample: 1200 µg/L | 14/31 | SYR4 | 2012–2019 |
| Chromium | 2.365 µg/L 2.4% of the EPA limit 100 µg/L
worst single sample: 2.5 µg/L | 11/19 | SYR4 | 2012–2019 |
| Arsenic | 1.46 µg/L 15% of the EPA limit 10 µg/L
worst single sample: 1.48 µg/L | 6/19 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 1.224 µg/L No EPA limit set
worst single sample: 1.24 µg/L | 5/86 | SYR4 | 2018–2019 |
| Selenium | 6.736 µg/L 13% of the EPA limit 50 µg/L
worst single sample: 6.82 µg/L | 5/19 | SYR4 | 2012–2019 |
| Lithium | 21.4 µg/L No EPA limit set | 5/12 | UCMR-5 | 2024 |
| Combined Uranium | 4.87 µg/L 16% of the EPA limit 30 µg/L
worst single sample: 5.2 µg/L | 3/3 | SYR4 | 2017 |
| Combined Radium (-226 And -228) | 3.89 pCi/L 78% of the EPA limit 5 pCi/L
worst single sample: 4 pCi/L | 2/2 | SYR4 | 2017 |
| Gross Alpha, Excl. Radon And U | 0.8750 pCi/L 5.8% of the EPA limit 15 pCi/L
worst single sample: 0.9000 pCi/L | 2/3 | SYR4 | 2017 |
| Mercury | 0.0290 µg/L 1.5% of the EPA limit 2 µg/L | 1/13 | SYR4 | 2012–2019 |
82 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, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Aurora City of
Is Aurora City of tap water safe to drink?
EPA monitoring detected 28 contaminants in Aurora City of'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 Aurora City of's water?
EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Chlorite, Bromodichloromethane, Chloroform, and others. The full list with the level and data source for each is above.
How many people does Aurora City of serve?
Aurora City of reports serving 533,407 people in Colorado, per its EPA record.
Has Aurora City of had any water quality violations?
The EPA has 17 violations on file for Aurora City of, of which 4 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.