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.
0
health-based violations
445
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MR | Monitoring | Resolved | 2024-03-01 → 2024-03-31 |
| MR | Monitoring | Resolved | 2024-03-01 → 2024-03-31 |
| MR | Monitoring | Resolved | 2024-03-01 → 2024-03-31 |
| MR | Monitoring | Resolved | 2024-01-01 → 2024-03-31 |
| MR | Monitoring | Resolved | 2024-01-01 → 2024-03-31 |
| MR | Monitoring | Resolved | 2024-01-01 → 2024-03-31 |
| MR | Monitoring | Archived | 2023-01-01 → 2025-12-31 |
| MR | Monitoring | Archived | 2023-01-01 → 2025-12-31 |
| MR | Monitoring | Archived | 2023-01-01 → 2025-12-31 |
| MR | Monitoring | Archived | 2023-01-01 → 2025-12-31 |
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 | 32.59 µg/L 41% of the EPA limit 80 µg/L
worst single sample: 41.64 µg/L | 1166/1166 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 23 µg/L 38% of the EPA limit 60 µg/L
worst single sample: 38 µg/L | 1135/1164 | SYR4 | 2012–2019 |
| Bromodichloromethane | 8.9 µg/L No EPA limit set
worst single sample: 11.6 µg/L | 569/623 | SYR4 | 2012–2019 |
| Chloroform | 20.265 µg/L No EPA limit set
worst single sample: 30.2 µg/L | 568/623 | SYR4 | 2012–2019 |
| Dibromochloromethane | 3.9 µg/L No EPA limit set
worst single sample: 6 µg/L | 520/624 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 12.8 µg/L No EPA limit set
worst single sample: 17.7 µg/L | 430/430 | SYR4 | 2016–2019 |
| Trichloroacetic Acid | 6.855 µg/L No EPA limit set
worst single sample: 9.9 µg/L | 430/535 | SYR4 | 2012–2019 |
| Fluoride | 803 µg/L 20% of the EPA limit 4000 µg/L
worst single sample: 1080 µg/L | 255/256 | SYR4 | 2012–2019 |
| Barium | 43.51 µg/L 2.2% of the EPA limit 2000 µg/L
worst single sample: 50 µg/L | 180/181 | SYR4 | 2012–2019 |
| Nitrate | 250 µg/L 2.5% of the EPA limit 10000 µg/L
worst single sample: 660 µg/L | 134/214 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 1.4 µg/L No EPA limit set
worst single sample: 1.7 µg/L | 101/430 | SYR4 | 2016–2019 |
| Monobromoacetic Acid | 2.82 µg/L No EPA limit set
worst single sample: 3.2 µg/L | 57/430 | SYR4 | 2016–2019 |
| Lead | 0.0031 mg/L 21% of the EPA limit 0.0150 mg/L | 51/51 | LCR | 2025 |
| Monochloroacetic Acid | 2.9 µg/L No EPA limit set
worst single sample: 4.9 µg/L | 39/430 | SYR4 | 2016–2019 |
| Nitrate-Nitrite | 252 µg/L 2.5% of the EPA limit 10000 µg/L
worst single sample: 290 µg/L | 39/50 | SYR4 | 2012–2019 |
| Bromoform | 0.8350 µg/L No EPA limit set
worst single sample: 1 µg/L | 34/623 | SYR4 | 2012–2019 |
| Chromium | 1.7 µg/L 1.7% of the EPA limit 100 µg/L
worst single sample: 4 µg/L | 31/181 | SYR4 | 2012–2019 |
| Combined Uranium | 5.775 µg/L 19% of the EPA limit 30 µg/L
worst single sample: 6.3 µg/L | 26/133 | SYR4 | 2012–2019 |
| Antimony, Total | 0.2285 µg/L 3.8% of the EPA limit 6 µg/L
worst single sample: 0.2800 µg/L | 24/181 | SYR4 | 2012–2019 |
| Selenium | 5.44 µg/L 11% of the EPA limit 50 µg/L
worst single sample: 6.8 µg/L | 9/178 | SYR4 | 2012–2019 |
| Cadmium | 0.0960 µg/L 1.9% of the EPA limit 5 µg/L
worst single sample: 0.1000 µg/L | 5/181 | SYR4 | 2012–2019 |
| Lithium | 10.8 µg/L No EPA limit set | 5/15 | UCMR-5 | 2025 |
| Arsenic | 1.14 µg/L 11% of the EPA limit 10 µg/L
worst single sample: 1.2 µg/L | 4/181 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 3 pCi/L No EPA limit set | 3/33 | SYR4 | 2012–2018 |
| Cyanide | 24.85 µg/L 12% of the EPA limit 200 µg/L
worst single sample: 25 µg/L | 2/33 | SYR4 | 2012–2015 |
| Carbon Tetrachloride | 0.4930 µg/L 9.9% of the EPA limit 5 µg/L
worst single sample: 0.5000 µg/L | 2/187 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 1.95 pCi/L 39% of the EPA limit 5 pCi/L
worst single sample: 2 pCi/L | 2/9 | SYR4 | 2012–2014 |
| Gross Alpha, Excl. Radon And U | 2 pCi/L 13% of the EPA limit 15 pCi/L | 2/22 | SYR4 | 2012–2018 |
| 2,4-D | 0.1000 µg/L 0.1% of the EPA limit 70 µg/L | 1/48 | SYR4 | 2012–2019 |
| Beryllium, Total | 0.0600 µg/L 1.5% of the EPA limit 4 µg/L | 1/179 | SYR4 | 2012–2019 |
| Mercury | 0.0700 µg/L 3.5% of the EPA limit 2 µg/L | 1/150 | SYR4 | 2012–2019 |
| Thallium, Total | 0.0600 µg/L 3% of the EPA limit 2 µg/L | 1/181 | SYR4 | 2012–2019 |
78 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAtrazineBhc-GammaBenzeneBenzo(A)PyreneChlorobenzeneCarbofuranChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Denver Water Board
Is Denver Water Board tap water safe to drink?
EPA monitoring detected 32 contaminants in Denver Water Board'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 Denver Water Board's water?
EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Bromodichloromethane, Chloroform, Dibromochloromethane, and others. The full list with the level and data source for each is above.
How many people does Denver Water Board serve?
Denver Water Board reports serving 1,287,000 people in Colorado, per its EPA record.
Has Denver Water Board had any water quality violations?
The EPA has 445 violations on file for Denver Water Board, of which 0 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.