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.
16
health-based violations
66
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2014-09-01 → 2014-09-30 |
| MCL | Health-based | Resolved | 2014-09-01 → 2014-09-30 |
| MCL | Health-based | Resolved | 2014-09-01 → 2014-09-30 |
| MCL | Health-based | Resolved | 2014-09-01 → 2014-09-30 |
| MCL | Health-based | Resolved | 2014-09-01 → 2014-09-30 |
| MCL | Health-based | Resolved | 2014-09-01 → 2014-09-30 |
| TT | Health-based | Resolved | 2013-05-01 → 2013-05-31 |
| TT | Health-based | Resolved | 2013-05-01 → 2013-05-31 |
| TT | Health-based | Resolved | 2013-05-01 → 2013-05-31 |
| MCL | Health-based | Resolved | 2009-09-01 → 2009-09-30 |
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 |
|---|---|---|---|---|
| Chlorite | 780 µg/L 78% of the EPA limit 1000 µg/L
worst single sample: 990 µg/L | 218/225 | SYR4 | 2013–2019 |
| Bromodichloromethane | 24.045 µg/L No EPA limit set
worst single sample: 32.5 µg/L | 152/152 | SYR4 | 2012–2019 |
| Chloroform | 54.42 µg/L No EPA limit set
worst single sample: 70.2 µg/L | 150/152 | SYR4 | 2012–2019 |
| Dibromochloromethane | 38.8 µg/L No EPA limit set
worst single sample: 55.4 µg/L | 140/152 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 24.31 µg/L No EPA limit set
worst single sample: 30.2 µg/L | 139/139 | SYR4 | 2012–2019 |
| TTHM | 91.13 µg/L 114% of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 140.7 µg/L | 139/140 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 44.22 µg/L 74% of the EPA limit 60 µg/L
worst single sample: 58.2 µg/L | 139/139 | SYR4 | 2012–2019 |
| Copper | 169.2 µg/L 13% of the EPA limit 1300 µg/L
worst single sample: 250 µg/L | 129/130 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 19.5 µg/L No EPA limit set
worst single sample: 22.9 µg/L | 129/139 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 15.15 µg/L No EPA limit set
worst single sample: 18.2 µg/L | 103/139 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 9 µg/L No EPA limit set
worst single sample: 11 µg/L | 96/139 | SYR4 | 2012–2019 |
| Bromoform | 30.665 µg/L No EPA limit set
worst single sample: 40 µg/L | 92/152 | SYR4 | 2012–2019 |
| Lead | 4.1185 µg/L 27% of the EPA limit 15 µg/L
worst single sample: 12.4 µg/L | 58/130 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 4.9 µg/L No EPA limit set
worst single sample: 7.2 µg/L | 41/139 | SYR4 | 2012–2019 |
| Nitrate | 508.8 µg/L 5.1% of the EPA limit 10000 µg/L
worst single sample: 600 µg/L | 40/42 | SYR4 | 2012–2019 |
| Fluoride | 430.4 µg/L 11% of the EPA limit 4000 µg/L
worst single sample: 434 µg/L | 13/13 | SYR4 | 2012–2019 |
| Lead | 0.0018 mg/L 12% of the EPA limit 0.0150 mg/L | 13/13 | LCR | 2025 |
| Barium | 112.25 µg/L 5.6% of the EPA limit 2000 µg/L
worst single sample: 115 µg/L | 12/12 | SYR4 | 2013–2019 |
| Chromium | 5.046 µg/L 5% of the EPA limit 100 µg/L
worst single sample: 5.75 µg/L | 9/12 | SYR4 | 2013–2019 |
| Arsenic | 2.408 µg/L 24% of the EPA limit 10 µg/L
worst single sample: 2.43 µg/L | 5/12 | SYR4 | 2013–2019 |
| Selenium | 7.774 µg/L 16% of the EPA limit 50 µg/L
worst single sample: 8.13 µg/L | 5/12 | SYR4 | 2013–2019 |
| Cyanide | 83.59 µg/L 42% of the EPA limit 200 µg/L
worst single sample: 86.2 µg/L | 4/10 | SYR4 | 2014–2019 |
| Lithium | 20.1 µg/L No EPA limit set | 4/4 | UCMR-5 | 2025 |
| Carbon Tetrachloride | 1.11 µg/L 22% of the EPA limit 5 µg/L | 1/13 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L | 1/1 | SYR4 | 2017 |
| Gross Beta Particle Activity | 5.1 pCi/L No EPA limit set | 1/2 | SYR4 | 2017 |
| Nitrate-Nitrite | 504 µg/L 5% of the EPA limit 10000 µg/L | 1/1 | SYR4 | 2012 |
| Thallium, Total | 0.3170 µg/L 16% of the EPA limit 2 µg/L | 1/12 | SYR4 | 2013–2019 |
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-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranChlordaneCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about City of Denison
Is City of Denison tap water safe to drink?
EPA monitoring detected 28 contaminants in City of Denison'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 City of Denison's water?
EPA monitoring detected Chlorite, Bromodichloromethane, Chloroform, Dibromochloromethane, Dichloroacetic Acid, and others. The full list with the level and data source for each is above.
How many people does City of Denison serve?
City of Denison reports serving 27,500 people in Texas, per its EPA record.
Has City of Denison had any water quality violations?
The EPA has 66 violations on file for City of Denison, of which 16 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.