OK2000908 · Oklahoma

CANADIAN CO RWD # 1

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

Violation records shown: 28
EPA health-based flag: 22
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 6

Counties listed by EPA · Canadian County, Oklahoma

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

Violations and what followed

Among 6 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 2,191 days. The interval uses the reporting periods and dates on file.

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195343 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start April 1, 2026 · period end June 30, 2026 · first reported August 11, 2026 · EPA return-to-compliance field June 30, 2026

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9172004	June 18, 2026	Informal	State Violation/Reminder Notice
9172005	June 18, 2026	Informal	State Public Notification requested
9172006	June 27, 2026	Informal	State Public Notification received

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195338 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start January 1, 2026 · period end March 31, 2026 · first reported May 13, 2026 · EPA return-to-compliance field March 31, 2026

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued
9171999	January 22, 2026	Informal	State Violation/Reminder Notice
9172000	January 22, 2026	Informal	State Public Notification requested
9172001	February 1, 2026	Informal	State Public Notification received

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195337 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start October 1, 2025 · period end December 31, 2025 · first reported February 18, 2026 · EPA return-to-compliance field December 31, 2025

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued
9171996	December 3, 2025	Informal	State Public Notification received
9171994	December 4, 2025	Informal	State Violation/Reminder Notice
9171995	December 4, 2025	Informal	State Public Notification requested

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195336 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start July 1, 2025 · period end September 30, 2025 · first reported November 14, 2025 · EPA return-to-compliance field September 30, 2025

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued
9171990	July 11, 2025	Informal	State Violation/Reminder Notice
9171991	July 11, 2025	Informal	State Public Notification requested
9171992	July 11, 2025	Informal	State Public Notification received

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195333 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start April 1, 2025 · period end June 30, 2025 · first reported August 13, 2025 · EPA return-to-compliance field June 30, 2025

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171985	May 16, 2025	Informal	State Violation/Reminder Notice
9171986	May 16, 2025	Informal	State Public Notification requested
9171993	May 16, 2025	Informal	State Public Notification received
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195332 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start January 1, 2025 · period end March 31, 2025 · first reported May 15, 2025 · EPA return-to-compliance field March 31, 2025

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171982	February 24, 2025	Informal	State Violation/Reminder Notice
9171983	February 24, 2025	Informal	State Public Notification requested
9171984	March 2, 2025	Informal	State Public Notification received
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195331 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start October 1, 2024 · period end December 31, 2024 · first reported February 25, 2025 · EPA return-to-compliance field December 31, 2024

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171978	November 22, 2024	Informal	State Violation/Reminder Notice
9171979	November 22, 2024	Informal	State Public Notification requested
9171980	December 3, 2024	Informal	State Public Notification received
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

Monitoring or reporting · Resolved

Monitoring and Reporting (DBP)Violation 195327 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start August 1, 2024 · period end August 31, 2024 · first reported December 30, 2024 · EPA return-to-compliance field August 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171970	October 21, 2024	Informal	State Violation/Reminder Notice
9171971	October 21, 2024	Informal	State Public Notification requested
9171975	November 5, 2024	Resolving	State Compliance achieved
9171987	June 20, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring and Reporting (DBP)Violation 195326 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule

Noncompliance period start July 1, 2024 · period end July 31, 2024 · first reported December 30, 2024 · EPA return-to-compliance field July 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171967	September 26, 2024	Informal	State Violation/Reminder Notice
9171968	September 26, 2024	Informal	State Public Notification requested
9171974	November 5, 2024	Resolving	State Compliance achieved
9171988	June 20, 2025	Informal	State Public Notification received

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195325 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start July 1, 2024 · period end September 30, 2024 · first reported December 30, 2024 · EPA return-to-compliance field September 30, 2024

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171954	July 23, 2024	Informal	State Violation/Reminder Notice
9171955	July 23, 2024	Informal	State Public Notification requested
9171969	July 24, 2024	Informal	State Public Notification received
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195324 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported September 30, 2024 · EPA return-to-compliance field June 30, 2024

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171949	April 25, 2024	Informal	State Violation/Reminder Notice
9171950	April 25, 2024	Informal	State Public Notification requested
9171951	April 30, 2024	Informal	State Public Notification received
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195323 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start January 1, 2024 · period end March 31, 2024 · first reported June 14, 2024 · EPA return-to-compliance field March 31, 2024

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171946	February 29, 2024	Informal	State Violation/Reminder Notice
9171947	February 29, 2024	Informal	State Public Notification requested
9171948	March 8, 2024	Informal	State Public Notification received
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195321 · Nitrate-Nitrite · Nitrate Rule

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

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171945	November 6, 2023	Informal	State Public Notification received
9171943	November 8, 2023	Informal	State Violation/Reminder Notice
9171944	November 8, 2023	Informal	State Public Notification requested
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195320 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start July 1, 2023 · period end September 30, 2023 · first reported January 2, 2024 · EPA return-to-compliance field September 30, 2023

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171940	October 3, 2023	Informal	State Violation/Reminder Notice
9171941	October 3, 2023	Informal	State Public Notification requested
9171942	October 6, 2023	Informal	State Public Notification received
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195319 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start April 1, 2023 · period end June 30, 2023 · first reported August 29, 2023 · EPA return-to-compliance field June 30, 2023

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171938	May 3, 2023	Informal	State Violation/Reminder Notice
9171939	May 3, 2023	Informal	State Public Notification requested
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195318 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start January 1, 2023 · period end March 31, 2023 · first reported May 31, 2023 · EPA return-to-compliance field March 31, 2023

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171913	April 20, 2021	Formal	State Administrative/Compliance Order with penalty issued
9171935	February 23, 2023	Informal	State Violation/Reminder Notice
9171936	February 23, 2023	Informal	State Public Notification requested
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195317 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start October 1, 2022 · period end December 31, 2022 · first reported March 27, 2023 · EPA return-to-compliance field December 31, 2022

6 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171913	April 20, 2021	Formal	State Administrative/Compliance Order with penalty issued
9171931	November 17, 2022	Informal	State Violation/Reminder Notice
9171932	November 17, 2022	Informal	State Public Notification requested
9171934	January 30, 2023	Informal	State Public Notification received
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195316 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start July 1, 2022 · period end September 30, 2022 · first reported November 15, 2022 · EPA return-to-compliance field September 30, 2022

6 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171913	April 20, 2021	Formal	State Administrative/Compliance Order with penalty issued
9171929	September 21, 2022	Informal	State Violation/Reminder Notice
9171930	September 21, 2022	Informal	State Public Notification requested
9171933	September 26, 2022	Informal	State Public Notification received
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195315 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start April 1, 2022 · period end June 30, 2022 · first reported September 26, 2022 · EPA return-to-compliance field June 30, 2022

5 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171913	April 20, 2021	Formal	State Administrative/Compliance Order with penalty issued
9171927	May 12, 2022	Informal	State Violation/Reminder Notice
9171928	May 12, 2022	Informal	State Public Notification requested
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195314 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start January 1, 2022 · period end March 31, 2022 · first reported May 19, 2022 · EPA return-to-compliance field March 31, 2022

6 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171913	April 20, 2021	Formal	State Administrative/Compliance Order with penalty issued
9171924	March 2, 2022	Informal	State Violation/Reminder Notice
9171925	March 2, 2022	Informal	State Public Notification requested
9171926	March 14, 2022	Informal	State Public Notification received
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195308 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start October 1, 2021 · period end December 31, 2021 · first reported February 17, 2022 · EPA return-to-compliance field December 31, 2021

6 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171913	April 20, 2021	Formal	State Administrative/Compliance Order with penalty issued
9171917	October 13, 2021	Informal	State Violation/Reminder Notice
9171921	October 13, 2021	Informal	State Public Notification requested
9171919	October 27, 2021	Informal	State Public Notification received
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195312 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start July 1, 2021 · period end September 30, 2021 · first reported February 17, 2022 · EPA return-to-compliance field September 30, 2021

6 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171913	April 20, 2021	Formal	State Administrative/Compliance Order with penalty issued
9171920	October 13, 2021	Informal	State Violation/Reminder Notice
9171921	October 13, 2021	Informal	State Public Notification requested
9171919	October 27, 2021	Informal	State Public Notification received
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195307 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start April 1, 2021 · period end June 30, 2021 · first reported September 8, 2021 · EPA return-to-compliance field June 30, 2021

6 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171913	April 20, 2021	Formal	State Administrative/Compliance Order with penalty issued
9171914	May 10, 2021	Informal	State Violation/Reminder Notice
9171915	May 10, 2021	Informal	State Public Notification requested
9171916	May 17, 2021	Informal	State Public Notification received
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, Single SampleViolation 195306 · Nitrate-Nitrite · Nitrate Rule

Noncompliance period start January 1, 2021 · period end March 31, 2021 · first reported June 24, 2021 · EPA return-to-compliance field March 31, 2021

7 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171889	May 23, 2019	Formal	State Administrative/Compliance Order with penalty issued
9171910	March 25, 2021	Informal	State Violation/Reminder Notice
9171911	March 25, 2021	Informal	State Public Notification requested
9171912	April 8, 2021	Informal	State Public Notification received
9171913	April 20, 2021	Formal	State Administrative/Compliance Order with penalty issued
9171937	February 21, 2024	Formal	State Administrative/Compliance Order with penalty issued
9171989	June 30, 2025	Formal	State Administrative/Compliance Order with penalty issued

Monitoring or reporting · Resolved

Monitoring, RegularViolation 195342 · Gross Beta Particle Activity · Radionuclides and Revised Rad Rule

Noncompliance period start January 1, 2020 · period end December 31, 2025 · first reported May 13, 2026 · EPA return-to-compliance field December 31, 2025

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171997	February 19, 2026	Informal	State Violation/Reminder Notice
9171998	February 19, 2026	Informal	State Public Notification requested
9172002	May 4, 2026	Resolving	State Compliance achieved
9172003	June 9, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 195341 · Combined Radium (-226 and -228) · Radionuclides and Revised Rad Rule

Noncompliance period start January 1, 2020 · period end December 31, 2025 · first reported May 13, 2026 · EPA return-to-compliance field December 31, 2025

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171997	February 19, 2026	Informal	State Violation/Reminder Notice
9171998	February 19, 2026	Informal	State Public Notification requested
9172002	May 4, 2026	Resolving	State Compliance achieved
9172003	June 9, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 195340 · Combined Uranium · Radionuclides and Revised Rad Rule

Noncompliance period start January 1, 2020 · period end December 31, 2025 · first reported May 13, 2026 · EPA return-to-compliance field December 31, 2025

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171997	February 19, 2026	Informal	State Violation/Reminder Notice
9171998	February 19, 2026	Informal	State Public Notification requested
9172002	May 4, 2026	Resolving	State Compliance achieved
9172003	June 9, 2026	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 195339 · Gross Alpha, Excl. Radon and U · Radionuclides and Revised Rad Rule

Noncompliance period start January 1, 2020 · period end December 31, 2025 · first reported May 13, 2026 · EPA return-to-compliance field December 31, 2025

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
9171997	February 19, 2026	Informal	State Violation/Reminder Notice
9171998	February 19, 2026	Informal	State Public Notification requested
9172002	May 4, 2026	Resolving	State Compliance achieved
9172003	June 9, 2026	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