AZ0411087 · Arizona
MARICOPA MOUNTAIN DWID 1
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 31
- EPA health-based flag
- 26
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 1
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 30 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 90 days. The interval uses the reporting periods and dates on file.
EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5637 · Nitrate · Nitrate RuleNoncompliance period start January 1, 2026 · period end March 31, 2026 · first reported May 14, 2026 · EPA return-to-compliance field March 31, 2026
5 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2777 January 16, 2026 Informal State Public Notification received 2774 January 20, 2026 Informal State Violation/Reminder Notice 2775 January 20, 2026 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5635 · Nitrate · Nitrate RuleNoncompliance period start October 1, 2025 · period end December 31, 2025 · first reported February 13, 2026 · EPA return-to-compliance field December 31, 2025
5 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2766 October 23, 2025 Informal State Public Notification received 2763 October 27, 2025 Informal State Violation/Reminder Notice 2764 October 27, 2025 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved Other or unclassified · Resolved
Public Notification Violation without NPDWR ViolationViolation 5636 · Public Notice · Public Notice Rule and Revised PN RuleNoncompliance period start September 27, 2025 · period end November 7, 2025 · first reported November 17, 2025 · EPA return-to-compliance field November 7, 2025
3 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2767 November 7, 2025 Informal State Violation/Reminder Notice 2769 November 7, 2025 Informal State Violation/Reminder Notice 2770 November 7, 2025 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5634 · Nitrate · Nitrate RuleNoncompliance period start July 1, 2025 · period end September 30, 2025 · first reported November 17, 2025 · EPA return-to-compliance field September 30, 2025
5 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2762 July 9, 2025 Informal State Public Notification received 2759 July 10, 2025 Informal State Violation/Reminder Notice 2760 July 10, 2025 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved Other or unclassified · Resolved
Public Notification Violation for NPDWR ViolationViolation 5633 · Public Notice · Public Notice Rule and Revised PN RuleNoncompliance period start April 1, 2025 · period end May 19, 2025 · first reported August 15, 2025 · EPA return-to-compliance field May 19, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2755 May 19, 2025 Informal State Violation/Reminder Notice 2758 May 19, 2025 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5632 · Nitrate · Nitrate RuleNoncompliance period start April 1, 2025 · period end June 30, 2025 · first reported August 15, 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 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2752 April 15, 2025 Informal State Violation/Reminder Notice 2753 April 15, 2025 Informal State Public Notification requested 2757 May 19, 2025 Informal State Public Notification received 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5630 · Nitrate · Nitrate RuleNoncompliance period start January 1, 2025 · period end March 31, 2025 · first reported February 24, 2026 · 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 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2750 January 17, 2025 Informal State Public Notification received 2744 January 28, 2025 Informal State Violation/Reminder Notice 2745 January 28, 2025 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5627 · Nitrate · Nitrate RuleNoncompliance period start October 1, 2024 · period end December 31, 2024 · first reported February 24, 2026 · 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 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2737 October 4, 2024 Informal State Public Notification received 2734 November 5, 2024 Informal State Violation/Reminder Notice 2735 November 5, 2024 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 5626 · Nitrate · Nitrate RuleNoncompliance period start July 1, 2024 · period end September 30, 2024 · first reported February 24, 2026 · EPA return-to-compliance field September 30, 2024
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2728 July 18, 2024 Informal State Public Notification requested 2731 October 3, 2024 Informal State Violation/Reminder Notice 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5624 · Nitrate · Nitrate RuleNoncompliance period start April 1, 2024 · period end June 30, 2024 · first reported February 24, 2026 · 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 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2726 April 17, 2024 Informal State Public Notification received 2723 April 19, 2024 Informal State Violation/Reminder Notice 2724 April 19, 2024 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5622 · Nitrate · Nitrate RuleNoncompliance period start January 1, 2024 · period end March 31, 2024 · first reported May 15, 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 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2722 January 12, 2024 Informal State Public Notification received 2716 March 4, 2024 Informal State Violation/Reminder Notice 2717 March 4, 2024 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5621 · Nitrate · Nitrate RuleNoncompliance period start October 1, 2023 · period end December 31, 2023 · first reported March 29, 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 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2721 October 17, 2023 Informal State Public Notification received 2713 February 28, 2024 Informal State Violation/Reminder Notice 2714 February 28, 2024 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 5631 · Nitrate · Nitrate RuleNoncompliance period start July 1, 2023 · period end September 30, 2023 · first reported February 24, 2026 · 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 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2751 August 2, 2023 Informal State Public Notification received 2747 January 28, 2025 Informal State Violation/Reminder Notice 2748 January 28, 2025 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5620 · Nitrate · Nitrate RuleNoncompliance period start April 1, 2023 · period end June 30, 2023 · first reported February 24, 2026 · EPA return-to-compliance field June 30, 2023
5 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2712 April 17, 2023 Informal State Public Notification received 2709 April 19, 2023 Informal State Violation/Reminder Notice 2710 April 19, 2023 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5619 · Nitrate · Nitrate RuleNoncompliance period start January 1, 2023 · period end March 31, 2023 · first reported February 24, 2026 · EPA return-to-compliance field March 31, 2023
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2706 January 25, 2023 Informal State Violation/Reminder Notice 2707 January 25, 2023 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5618 · Nitrate · Nitrate RuleNoncompliance period start October 1, 2022 · period end December 31, 2022 · first reported February 15, 2023 · EPA return-to-compliance field December 31, 2022
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2703 October 24, 2022 Informal State Violation/Reminder Notice 2704 October 24, 2022 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved Other or unclassified · Resolved
Public Notification Violation for NPDWR ViolationViolation 5616 · Public Notice · Public Notice Rule and Revised PN RuleNoncompliance period start July 24, 2022 · period end July 9, 2022 · first reported November 16, 2022 · EPA return-to-compliance field July 9, 2022
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2699 July 9, 2022 Resolving State Compliance achieved 2697 August 16, 2022 Informal State Violation/Reminder Notice EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5615 · Nitrate · Nitrate RuleNoncompliance period start July 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 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2694 July 26, 2022 Informal State Violation/Reminder Notice 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5614 · Nitrate · Nitrate RuleNoncompliance 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 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2691 July 26, 2022 Informal State Violation/Reminder Notice 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 5617 · Nitrate · Nitrate RuleNoncompliance period start January 1, 2022 · period end March 31, 2022 · first reported September 29, 2022 · EPA return-to-compliance field March 31, 2022
3 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2700 August 31, 2022 Informal State Violation/Reminder Notice 2778 April 17, 2026 Resolving State Compliance achieved Other or unclassified · Resolved
Consumer Confidence Report Inadequate ReportingViolation 5611 · Consumer Confidence Rule · Consumer Confidence RuleNoncompliance period start October 2, 2021 · period end October 13, 2021 · first reported February 16, 2022 · EPA return-to-compliance field October 13, 2021
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2683 October 13, 2021 Resolving State Compliance achieved 2681 October 25, 2021 Informal State Violation/Reminder Notice EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5612 · Nitrate · Nitrate RuleNoncompliance period start October 1, 2021 · period end December 31, 2021 · first reported February 16, 2022 · EPA return-to-compliance field December 31, 2021
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2684 November 3, 2021 Informal State Violation/Reminder Notice 2685 November 3, 2021 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 5610 · Arsenic · Arsenic RuleNoncompliance period start July 1, 2021 · period end September 30, 2021 · first reported November 10, 2021 · EPA return-to-compliance field September 30, 2021
3 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2677 September 2, 2021 Informal State Violation/Reminder Notice 2678 September 2, 2021 Informal State Public Notification requested 2690 February 4, 2022 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5609 · Nitrate · Nitrate RuleNoncompliance period start July 1, 2021 · period end September 30, 2021 · first reported November 10, 2021 · EPA return-to-compliance field September 30, 2021
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2673 August 27, 2021 Informal State Violation/Reminder Notice 2674 August 27, 2021 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 5608 · Arsenic · Arsenic RuleNoncompliance period start April 1, 2021 · period end June 30, 2021 · first reported August 12, 2021 · EPA return-to-compliance field June 30, 2021
3 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2669 June 23, 2021 Informal State Violation/Reminder Notice 2670 June 23, 2021 Informal State Public Notification requested 2690 February 4, 2022 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5607 · Nitrate · Nitrate RuleNoncompliance period start April 1, 2021 · period end June 30, 2021 · first reported August 12, 2021 · EPA return-to-compliance field June 30, 2021
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2665 June 23, 2021 Informal State Violation/Reminder Notice 2666 June 23, 2021 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring and Reporting (DBP)Violation 5604 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts RuleNoncompliance period start January 1, 2021 · period end March 31, 2021 · first reported August 12, 2021 · EPA return-to-compliance field March 31, 2021
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2664 May 11, 2021 Resolving State Compliance achieved 2662 May 25, 2021 Informal State Violation/Reminder Notice EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 5603 · Arsenic · Arsenic RuleNoncompliance period start January 1, 2021 · period end March 31, 2021 · first reported March 31, 2021 · EPA return-to-compliance field March 31, 2021
3 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2654 March 18, 2021 Informal State Violation/Reminder Notice 2655 March 18, 2021 Informal State Public Notification requested 2690 February 4, 2022 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5602 · Nitrate · Nitrate RuleNoncompliance period start January 1, 2021 · period end March 31, 2021 · first reported March 31, 2021 · EPA return-to-compliance field March 31, 2021
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2650 March 18, 2021 Informal State Violation/Reminder Notice 2651 March 18, 2021 Informal State Public Notification requested 2778 April 17, 2026 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, AverageViolation 5601 · Arsenic · Arsenic RuleNoncompliance period start October 1, 2020 · period end December 31, 2020 · first reported February 12, 2021 · EPA return-to-compliance field December 31, 2020
3 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2646 October 22, 2020 Informal State Violation/Reminder Notice 2647 October 22, 2020 Informal State Public Notification requested 2690 February 4, 2022 Resolving State Compliance achieved EPA health-based flag · Resolved
Maximum Contaminant Level Violation, Single SampleViolation 5600 · Nitrate · Nitrate RuleNoncompliance period start October 1, 2020 · period end December 31, 2020 · first reported February 12, 2021 · EPA return-to-compliance field December 31, 2020
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 2625 October 25, 2019 Formal State Administrative/Compliance Order without penalty issued 2642 October 22, 2020 Informal State Violation/Reminder Notice 2643 October 22, 2020 Informal State Public Notification requested 2778 April 17, 2026 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