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
52
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MR | Monitoring | Resolved | 2025-06-01 → 2025-06-30 |
| MR | Monitoring | Resolved | 2025-06-01 → 2025-06-30 |
| MR | Monitoring | Resolved | 2025-06-01 → 2025-06-30 |
| MR | Monitoring | Resolved | 2025-05-01 → 2025-05-31 |
| MR | Monitoring | Resolved | 2025-05-01 → 2025-05-31 |
| MR | Monitoring | Resolved | 2025-05-01 → 2025-05-31 |
| MR | Monitoring | Resolved | 2022-04-01 → 2022-06-30 |
| MR | Monitoring | Resolved | 2022-04-01 → 2022-06-30 |
| MR | Monitoring | Resolved | 2022-04-01 → 2022-06-30 |
| MR | Monitoring | Resolved | 2022-04-01 → 2022-06-30 |
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 |
|---|---|---|---|---|
| TTHM | 18.39 µg/L 23% of the EPA limit 80 µg/L
worst single sample: 67.49 µg/L | 208/210 | SYR4 | 2012–2019 |
| Chloroform | 2.405 µg/L No EPA limit set
worst single sample: 5.3 µg/L | 111/113 | SYR4 | 2015–2019 |
| Bromodichloromethane | 6.335 µg/L No EPA limit set
worst single sample: 9.3 µg/L | 96/113 | SYR4 | 2015–2019 |
| Total Haloacetic Acids (HAA5) | 7.81 µg/L 13% of the EPA limit 60 µg/L
worst single sample: 9.3 µg/L | 74/210 | SYR4 | 2012–2019 |
| Dibromochloromethane | 10.9195 µg/L No EPA limit set
worst single sample: 14.1 µg/L | 68/113 | SYR4 | 2015–2019 |
| Nitrate | 300 µg/L 3% of the EPA limit 10000 µg/L
worst single sample: 350 µg/L | 62/110 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 2.78 µg/L No EPA limit set
worst single sample: 4.5 µg/L | 45/112 | SYR4 | 2016–2019 |
| Bromoform | 6.3 µg/L No EPA limit set
worst single sample: 7.49 µg/L | 41/113 | SYR4 | 2015–2019 |
| Barium | 248.8 µg/L 12% of the EPA limit 2000 µg/L
worst single sample: 520 µg/L | 37/37 | SYR4 | 2012–2019 |
| Fluoride | 988 µg/L 25% of the EPA limit 4000 µg/L
worst single sample: 1100 µg/L | 37/37 | SYR4 | 2012–2019 |
| Lead | 0.0020 mg/L 13% of the EPA limit 0.0150 mg/L | 33/33 | LCR | 2025 |
| Combined Radium (-226 And -228) | 4.52 pCi/L 90% of the EPA limit 5 pCi/L
worst single sample: 5.2 pCi/L | 29/29 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 4.32 µg/L No EPA limit set
worst single sample: 4.6 µg/L | 29/112 | SYR4 | 2016–2019 |
| Gross Alpha, Excl. Radon And U | 7.02 pCi/L 47% of the EPA limit 15 pCi/L
worst single sample: 7.63 pCi/L | 25/28 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 310 µg/L 3.1% of the EPA limit 10000 µg/L
worst single sample: 350 µg/L | 17/26 | SYR4 | 2012–2019 |
| Lithium | 25 µg/L No EPA limit set | 11/12 | UCMR-5 | 2024 |
| Monobromoacetic Acid | 2.16 µg/L No EPA limit set
worst single sample: 2.2 µg/L | 9/112 | SYR4 | 2016–2019 |
| Combined Uranium | 2.65 µg/L 8.8% of the EPA limit 30 µg/L
worst single sample: 3 µg/L | 8/29 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 7 pCi/L No EPA limit set | 8/12 | SYR4 | 2012–2018 |
| Chromium | 2.7 µg/L 2.7% of the EPA limit 100 µg/L
worst single sample: 3 µg/L | 7/37 | SYR4 | 2012–2019 |
| Selenium | 4.5 µg/L 9% of the EPA limit 50 µg/L
worst single sample: 5 µg/L | 6/37 | SYR4 | 2012–2019 |
| Xylenes, Total | 26.315 µg/L 0.3% of the EPA limit 10000 µg/L
worst single sample: 27.5 µg/L | 2/56 | SYR4 | 2012–2019 |
| Arsenic | 1.9 µg/L 19% of the EPA limit 10 µg/L | 1/37 | SYR4 | 2012–2019 |
| Di(2-ethylhexyl) Phthalate | 1.9 µg/L 32% of the EPA limit 6 µg/L | 1/49 | SYR4 | 2012–2019 |
| Ethylbenzene | 2.3 µg/L 0.3% of the EPA limit 700 µg/L | 1/56 | SYR4 | 2012–2019 |
| Picloram | 0.1000 µg/L 0% of the EPA limit 500 µg/L | 1/48 | SYR4 | 2012–2019 |
| Thallium, Total | 2 µg/L 100% of the EPA limit 2 µg/L | 1/37 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 1.3 µg/L No EPA limit set | 1/113 | SYR4 | 2014–2019 |
81 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, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolSimazineStyreneTetrachloroethyleneTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Castle Rock Town of
Is Castle Rock Town of tap water safe to drink?
EPA monitoring detected 30 contaminants in Castle Rock Town 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 Castle Rock Town of's water?
EPA monitoring detected TTHM, Chloroform, Bromodichloromethane, Total Haloacetic Acids (HAA5), Dibromochloromethane, and others. The full list with the level and data source for each is above.
How many people does Castle Rock Town of serve?
Castle Rock Town of reports serving 110,298 people in Colorado, per its EPA record.
Has Castle Rock Town of had any water quality violations?
The EPA has 52 violations on file for Castle Rock Town of, 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.