AZ0410968 · Arizona
RIO MERCADO WATER
Federal fiscal 2026Q3 · EPA violation and follow-up records
- Violation records shown
- 10
- EPA health-based flag
- 1
- Health-based records unresolved in this snapshot
- 0
- Monitoring and reporting records
- 9
Counties listed by EPA · Pima 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 10 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 83 days. The interval uses the reporting periods and dates on file.
Monitoring or reporting · Resolved
Initial Tap Sampling for Pb and CuViolation 14 · Lead and Copper Rule · Lead and Copper RuleNoncompliance period start January 1, 2026 · period end May 14, 2026 · first reported May 14, 2026 · EPA return-to-compliance field May 14, 2026
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 36 February 10, 2026 Informal State Violation/Reminder Notice 37 February 10, 2026 Informal State Public Notification requested 48 May 14, 2026 Resolving State Compliance achieved 50 June 26, 2026 Informal State Public Notification received Monitoring or reporting · Resolved
Initial Tap Sampling for Pb and CuViolation 9 · Lead and Copper Rule · Lead and Copper RuleNoncompliance period start July 1, 2025 · period end November 4, 2025 · first reported February 24, 2026 · EPA return-to-compliance field November 4, 2025
2 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 45 November 4, 2025 Informal State Violation/Reminder Notice 46 November 4, 2025 Resolving State Compliance achieved Monitoring or reporting · Resolved
Initial Tap Sampling for Pb and CuViolation 6 · Lead and Copper Rule · Lead and Copper RuleNoncompliance period start January 1, 2025 · period end June 30, 2025 · first reported February 24, 2026 · EPA return-to-compliance field June 30, 2025
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 22 January 31, 2025 Informal State Violation/Reminder Notice 23 January 31, 2025 Informal State Public Notification requested 31 June 16, 2025 Informal State Public Notification received 32 June 30, 2025 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, RegularViolation 13 · Fluoride · Inorganic ChemicalsNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 24, 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 42 February 9, 2026 Informal State Violation/Reminder Notice 43 February 9, 2026 Informal State Public Notification requested 49 June 16, 2026 Resolving State Compliance achieved 52 June 26, 2026 Informal State Public Notification received Monitoring or reporting · Resolved
Monitoring, RegularViolation 12 · Arsenic · Arsenic RuleNoncompliance period start January 1, 2025 · period end December 31, 2025 · first reported February 24, 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 39 February 9, 2026 Informal State Violation/Reminder Notice 40 February 9, 2026 Informal State Public Notification requested 49 June 16, 2026 Resolving State Compliance achieved 51 June 26, 2026 Informal State Public Notification received EPA health-based flag · Resolved
LSL InventoryViolation 4 · LEAD AND COPPER RULE REVISIONS · Lead and Copper Rule RevisionsNoncompliance period start October 17, 2024 · period end November 26, 2024 · first reported February 24, 2026 · EPA return-to-compliance field November 26, 2024
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 11 November 14, 2024 Informal State Violation/Reminder Notice 12 November 14, 2024 Informal State Public Notification requested 17 November 21, 2024 Informal State Public Notification received 20 November 26, 2024 Resolving State Compliance achieved Monitoring or reporting · Resolved
LSL ReportingViolation 3 · LEAD AND COPPER RULE REVISIONS · Lead and Copper Rule RevisionsNoncompliance period start October 17, 2024 · period end November 26, 2024 · first reported February 24, 2026 · EPA return-to-compliance field November 26, 2024
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 7 November 7, 2024 Informal State Violation/Reminder Notice 8 November 7, 2024 Informal State Public Notification requested 18 November 21, 2024 Informal State Public Notification received 20 November 26, 2024 Resolving State Compliance achieved Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 5 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start October 1, 2024 · period end October 31, 2024 · first reported February 24, 2026 · EPA return-to-compliance field October 31, 2024
4 linked actions
Enforcement and resolution records linked by EPA Action ID Date Category EPA action type 14 November 18, 2024 Informal State Violation/Reminder Notice 15 November 18, 2024 Informal State Public Notification requested 19 November 26, 2024 Resolving State Compliance achieved 28 June 16, 2025 Informal State Public Notification received Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 2 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start September 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 4 November 4, 2024 Informal State Violation/Reminder Notice 5 November 4, 2024 Informal State Public Notification requested 19 November 26, 2024 Resolving State Compliance achieved 29 June 16, 2025 Informal State Public Notification received Monitoring or reporting · Resolved
Monitoring, Routine (RTCR)Violation 1 · Revised Total Coliform Rule · Revised Total Coliform RuleNoncompliance period start August 1, 2024 · period end August 31, 2024 · first reported February 24, 2026 · 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 1 September 18, 2024 Informal State Violation/Reminder Notice 2 September 18, 2024 Informal State Public Notification requested 19 November 26, 2024 Resolving State Compliance achieved 30 June 16, 2025 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