CO0116001 · Colorado
DENVER WATER BOARD
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 34
- EPA health-based flag
- 0
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 34
Counties listed by EPA · Denver County, Colorado
Find the utility’s annual water quality report. For current advisories, check the utility or local drinking-water authority.
Violations and what followed
Among 3 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 30 days. The interval uses the reporting periods and dates on file.
Monitoring or reporting · Resolved
Monitoring, Turbidity (Enhanced SWTR)Violation 1290 · Interim Enhanced Surface Water Treatment Rule · Interim and Long Term 1 Enhanced Surface Water Treatment RuleNoncompliance period start March 1, 2024 · period end March 31, 2024 · first reported May 16, 2024 · EPA return-to-compliance field March 31, 2024
3 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 36 April 9, 2024 Informal State Violation/Reminder Notice 37 April 9, 2024 Informal State Public Notification requested 38 May 8, 2024 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 1289 · Combined Uranium · Radionuclides and Revised Rad RuleNoncompliance period start January 1, 2024 · period end March 31, 2024 · first reported May 16, 2024 · EPA return-to-compliance field March 31, 2024
3 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 34 April 9, 2024 Informal State Violation/Reminder Notice 35 April 9, 2024 Informal State Public Notification requested 39 August 6, 2024 Resolving State Compliance achieved Monitoring or reporting · Archived
Monitoring, RegularViolation 1432 · Chlordane · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1431 · ETHYLENE DIBROMIDE · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1430 · 1,2-DIBROMO-3-CHLOROPROPANE · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1429 · Total Polychlorinated Biphenyls (PCB) · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1428 · Pentachlorophenol · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1427 · Benzo(a)pyrene · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1426 · HEXACHLOROBENZENE · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1425 · 2,4,5-TP · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1424 · 2,4-D · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1423 · Heptachlor epoxide · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1422 · Heptachlor · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1421 · LASSO · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1420 · Atrazine · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1419 · Aldicarb · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1418 · Carbofuran · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1417 · Aldicarb sulfone · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1416 · Aldicarb sulfoxide · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1415 · Hexachlorocyclopentadiene · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1414 · Dinoseb · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1413 · Picloram · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1412 · Di(2-ethylhexyl) phthalate · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1411 · Simazine · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1410 · OXAMYL · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1409 · Di(2-ethylhexyl) adipate · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1408 · Endothall · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1407 · Diquat · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1406 · Dalapon · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1405 · Toxaphene · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1404 · Methoxychlor · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1403 · BHC-GAMMA · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Archived
Monitoring, RegularViolation 1402 · Endrin · Synthetic Organic ChemicalsNoncompliance period start January 1, 2023 · period end December 31, 2025 · first reported February 23, 2026 · EPA return-to-compliance field December 31, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 40 February 10, 2026 Informal State Violation/Reminder Notice 41 February 10, 2026 Informal State Public Notification requested Monitoring or reporting · Resolved
Monitoring, Turbidity (Enhanced SWTR)Violation 1272 · Interim Enhanced Surface Water Treatment Rule · Interim and Long Term 1 Enhanced Surface Water Treatment RuleNoncompliance period start September 1, 2022 · period end September 30, 2022 · first reported November 16, 2022 · EPA return-to-compliance field September 30, 2022
3 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 31 October 12, 2022 Informal State Violation/Reminder Notice 32 October 12, 2022 Informal State Public Notification requested 33 November 8, 2022 Resolving State Compliance achieved
EPA data and scope
How to read the records
The enforcement snapshot is federal fiscal 2026Q3. The EPA archive labels its violation file October 13, 2026. EPA says federal reporting can lag by several months. For current advisories, check your utility or local drinking-water authority.
- We matched active community water systems by public water system ID between EPA’s system search and SDWIS inventory. We show violations with a recorded noncompliance, initial reporting or return-to-compliance date from 2021 onward, plus earlier records listed as Addressed or Unaddressed.
- EPA’s health-based flag identifies violations of contaminant or disinfectant limits or treatment requirements. Monitoring and reporting violations describe required tests or reports. Neither category measures household exposure.
- Addressed means EPA records formal enforcement on a violation that remains unresolved in the snapshot. Unaddressed means no formal action is recorded for an unresolved violation. Resolved can mean compliance was restored, the rule ceased to apply, or further action was unnecessary. Archived is a separate status.
- We count a violation once per water system and group its distinct linked actions. Conflicting records are set aside. Places are EPA-listed search locations and can include mailing locations. Use the provider name and system ID to identify your service.
EPA data dictionary and files · EPA reporting and enforcement FAQ · Find an annual water quality report · How to get the report from your utility