AZ0411128 · Arizona

EPCOR - SAN TAN

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

Violation records shown: 33
EPA health-based flag: 0
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 33

Counties listed by EPA · Pinal County, Arizona

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

Violations and what followed

Among 33 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 365 days. The interval uses the reporting periods and dates on file.

Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 6516 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start March 1, 2026 · period end March 31, 2026 · first reported May 14, 2026 · EPA return-to-compliance field March 31, 2026

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3547 May 4, 2026 Informal State Violation/Reminder Notice
3548 May 4, 2026 Resolving State Compliance achieved
Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 6489 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start December 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3523 January 29, 2025 Informal State Violation/Reminder Notice
3529 January 29, 2025 Resolving State Compliance achieved
Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 6488 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start September 1, 2024 · period end September 30, 2024 · first reported December 31, 2024 · EPA return-to-compliance field September 30, 2024

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3520 November 27, 2024 Informal State Violation/Reminder Notice
3522 December 4, 2024 Resolving State Compliance achieved
Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 6487 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start April 1, 2024 · period end April 30, 2024 · first reported August 14, 2024 · EPA return-to-compliance field April 30, 2024

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3517 August 5, 2024 Informal State Violation/Reminder Notice
3519 August 5, 2024 Resolving State Compliance achieved
Monitoring or reporting · Resolved
Monitoring, RegularViolation 6515 · Nitrate · Nitrate Rule
Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3536 January 30, 2025 Informal State Violation/Reminder Notice
3544 February 5, 2025 Resolving State Compliance achieved
Monitoring or reporting · Resolved
Monitoring, RegularViolation 6514 · Nitrate · Nitrate Rule
Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 24, 2026 · EPA return-to-compliance field December 31, 2024

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3534 January 30, 2025 Informal State Violation/Reminder Notice
3542 February 6, 2025 Resolving State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3547	May 4, 2026	Informal	State Violation/Reminder Notice
3548	May 4, 2026	Resolving	State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3523	January 29, 2025	Informal	State Violation/Reminder Notice
3529	January 29, 2025	Resolving	State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3520	November 27, 2024	Informal	State Violation/Reminder Notice
3522	December 4, 2024	Resolving	State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3517	August 5, 2024	Informal	State Violation/Reminder Notice
3519	August 5, 2024	Resolving	State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3536	January 30, 2025	Informal	State Violation/Reminder Notice
3544	February 5, 2025	Resolving	State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3534	January 30, 2025	Informal	State Violation/Reminder Notice
3542	February 6, 2025	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6513 · Styrene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6512 · Ethylbenzene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6511 · Toluene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6510 · Benzene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6509 · CHLOROBENZENE · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6508 · Tetrachloroethylene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6507 · 1,1,2-Trichloroethane · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6506 · Trichloroethylene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6505 · 1,2-Dichloropropane · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6504 · Carbon tetrachloride · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6503 · 1,1,1-Trichloroethane · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6502 · 1,2-Dichloroethane · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6501 · trans-1,2-Dichloroethylene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6500 · 1,1-Dichloroethylene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6499 · p-Dichlorobenzene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6498 · o-Dichlorobenzene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6497 · DICHLOROMETHANE · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6496 · Xylenes, Total · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 24, 2026 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6495 · cis-1,2-Dichloroethylene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved

Monitoring, RegularViolation 6494 · 1,2,4-Trichlorobenzene · Volatile Organic Chemicals

Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

4 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3538	January 30, 2025	Informal	State Violation/Reminder Notice
3539	January 30, 2025	Informal	State Public Notification requested
3545	February 7, 2025	Resolving	State Compliance achieved
3546	September 30, 2025	Informal	State Public Notification received

Monitoring or reporting · Resolved
Monitoring, RegularViolation 6493 · Nitrate · Nitrate Rule
Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3532 January 30, 2025 Informal State Violation/Reminder Notice
3541 February 6, 2025 Resolving State Compliance achieved
Monitoring or reporting · Resolved
Monitoring, RegularViolation 6492 · Nitrate · Nitrate Rule
Noncompliance period start January 1, 2024 · period end December 31, 2024 · first reported February 18, 2025 · EPA return-to-compliance field December 31, 2024

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3530 January 30, 2025 Informal State Violation/Reminder Notice
3543 February 5, 2025 Resolving State Compliance achieved
Monitoring or reporting · Resolved
Monitoring, RegularViolation 6463 · Nitrate · Nitrate 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

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3507 July 29, 2022 Informal State Violation/Reminder Notice
3509 July 29, 2022 Resolving State Compliance achieved
Monitoring or reporting · Resolved
Monitoring, RegularViolation 6462 · Nitrate · Nitrate 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

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3505 July 29, 2022 Informal State Violation/Reminder Notice
3509 July 29, 2022 Resolving State Compliance achieved
Monitoring or reporting · Resolved
Monitoring, RegularViolation 6461 · Nitrate · Nitrate 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

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3503 July 29, 2022 Informal State Violation/Reminder Notice
3509 July 29, 2022 Resolving State Compliance achieved
Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 6458 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts 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

2 linked actions

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
3500 July 29, 2022 Informal State Violation/Reminder Notice
3502 July 29, 2022 Resolving State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3532	January 30, 2025	Informal	State Violation/Reminder Notice
3541	February 6, 2025	Resolving	State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3530	January 30, 2025	Informal	State Violation/Reminder Notice
3543	February 5, 2025	Resolving	State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3507	July 29, 2022	Informal	State Violation/Reminder Notice
3509	July 29, 2022	Resolving	State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3505	July 29, 2022	Informal	State Violation/Reminder Notice
3509	July 29, 2022	Resolving	State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3503	July 29, 2022	Informal	State Violation/Reminder Notice
3509	July 29, 2022	Resolving	State Compliance achieved

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3500	July 29, 2022	Informal	State Violation/Reminder Notice
3502	July 29, 2022	Resolving	State Compliance achieved

Monitoring or reporting · Resolved

Monitoring, Source Water (GWR)Violation 6457 · E. COLI · Ground Water Rule

Noncompliance period start October 7, 2020 · period end October 21, 2020 · first reported February 12, 2021 · EPA return-to-compliance field October 21, 2020

3 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
3495	October 21, 2020	Resolving	State Compliance achieved
3492	November 24, 2020	Informal	State Violation/Reminder Notice
3493	November 24, 2020	Informal	State Public Notification requested

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