Skip to content

CO0101150 · Colorado

THORNTON CITY OF

Federal fiscal 2026Q3 · EPA violation and follow-up records

Violation records shown: 8
EPA health-based flag: 0
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 8

Counties listed by EPA · Adams County, Colorado

Open the EPA system record

Find the utility’s annual water quality report. For current advisories, check the utility or local drinking-water authority.

Violations and what followed

Among 8 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 60 days. The interval uses the reporting periods and dates on file.

Monitoring or reporting · Resolved

Monitoring, Turbidity (Enhanced SWTR)Violation 1135 · Interim Enhanced Surface Water Treatment Rule · Interim and Long Term 1 Enhanced Surface Water Treatment Rule

Noncompliance period start November 1, 2023 · period end November 30, 2023 · first reported February 14, 2024 · EPA return-to-compliance field November 30, 2023

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
139	December 13, 2023	Informal	State Violation/Reminder Notice
140	December 13, 2023	Informal	State Public Notification requested
141	January 3, 2024	Resolving	State Compliance achieved
143	June 28, 2024	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, Turbidity (Enhanced SWTR)Violation 1134 · Interim Enhanced Surface Water Treatment Rule · Interim and Long Term 1 Enhanced Surface Water Treatment Rule

Noncompliance period start October 1, 2023 · period end October 31, 2023 · first reported February 14, 2024 · EPA return-to-compliance field October 31, 2023

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
137	November 20, 2023	Informal	State Violation/Reminder Notice
138	November 20, 2023	Informal	State Public Notification requested
141	January 3, 2024	Resolving	State Compliance achieved
143	June 28, 2024	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, Turbidity (Enhanced SWTR)Violation 1133 · Interim Enhanced Surface Water Treatment Rule · Interim and Long Term 1 Enhanced Surface Water Treatment Rule

Noncompliance period start September 1, 2023 · period end September 30, 2023 · first reported February 14, 2024 · EPA return-to-compliance field September 30, 2023

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
135	November 20, 2023	Informal	State Violation/Reminder Notice
136	November 20, 2023	Informal	State Public Notification requested
141	January 3, 2024	Resolving	State Compliance achieved
143	June 28, 2024	Informal	State Public Notification received

Monitoring or reporting · Resolved

Follow-up Or Routine LCR Tap M/RViolation 1132 · Lead and Copper Rule · Lead and Copper Rule

Noncompliance period start July 1, 2023 · period end December 29, 2023 · first reported August 15, 2023 · EPA return-to-compliance field December 29, 2023

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
133	July 26, 2023	Informal	State Violation/Reminder Notice
134	July 26, 2023	Informal	State Public Notification requested
142	December 29, 2023	Resolving	State Compliance achieved
143	June 28, 2024	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 1129 · Gross Alpha, Excl. Radon and U · Radionuclides and Revised Rad Rule

Noncompliance period start April 1, 2022 · period end June 30, 2022 · first reported August 15, 2022 · EPA return-to-compliance field June 30, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
130	August 9, 2022	Informal	State Violation/Reminder Notice
131	August 9, 2022	Informal	State Public Notification requested
132	August 29, 2022	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring, RegularViolation 1128 · Combined Uranium · Radionuclides and Revised Rad Rule

Noncompliance period start April 1, 2022 · period end June 30, 2022 · first reported August 15, 2022 · EPA return-to-compliance field June 30, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
128	August 9, 2022	Informal	State Violation/Reminder Notice
129	August 9, 2022	Informal	State Public Notification requested
132	August 29, 2022	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring, RegularViolation 1127 · Combined Radium (-226 and -228) · Radionuclides and Revised Rad Rule

Noncompliance period start April 1, 2022 · period end June 30, 2022 · first reported August 15, 2022 · EPA return-to-compliance field June 30, 2022

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
126	August 9, 2022	Informal	State Violation/Reminder Notice
127	August 9, 2022	Informal	State Public Notification requested
132	August 29, 2022	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring, Turbidity (Enhanced SWTR)Violation 1061 · Interim Enhanced Surface Water Treatment Rule · Interim and Long Term 1 Enhanced Surface Water Treatment Rule

Noncompliance period start May 1, 2021 · period end May 31, 2021 · first reported August 18, 2021 · EPA return-to-compliance field May 31, 2021

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
122	June 15, 2021	Informal	State Violation/Reminder Notice
123	June 15, 2021	Informal	State Public Notification requested
124	November 12, 2021	Resolving	State Compliance achieved
125	May 26, 2022	Informal	State Public Notification received

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