CA3700866 · California

DEL DIOS MUTUAL WATER COMPANY

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

Violation records shown: 12
EPA health-based flag: 0
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 11

Counties listed by EPA · San Diego County, California

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

Violations and what followed

Among 2 resolved records with both dates, the median interval from recorded noncompliance start to EPA’s return-to-compliance date was 716.5 days. The interval uses the reporting periods and dates on file.

Other or unclassified · Resolved

Consumer Confidence Report Complete Failure to ReportViolation 1303818 · Consumer Confidence Rule · Consumer Confidence Rule

Noncompliance period start July 1, 2024 · period end June 7, 2025 · first reported November 15, 2024 · EPA return-to-compliance field June 7, 2025

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304784	October 4, 2024	Formal	State Administrative/Compliance Order without penalty issued
1304786	June 7, 2025	Resolving	State Compliance achieved

Monitoring or reporting · Archived
Monitoring and Reporting (DBP)Violation 1303841 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start January 1, 2024 · period end January 31, 2024 · first reported September 22, 2026 · EPA return-to-compliance field January 31, 2024

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
1304785 November 14, 2025 Formal State Administrative/Compliance Order with penalty issued
Monitoring or reporting · Archived
Monitoring and Reporting (DBP)Violation 1303840 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start October 1, 2023 · period end December 31, 2023 · first reported September 22, 2026 · EPA return-to-compliance field December 31, 2023

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
1304785 November 14, 2025 Formal State Administrative/Compliance Order with penalty issued
Monitoring or reporting · Archived
Monitoring and Reporting (DBP)Violation 1303839 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start July 1, 2023 · period end September 30, 2023 · first reported September 22, 2026 · EPA return-to-compliance field September 30, 2023

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
1304785 November 14, 2025 Formal State Administrative/Compliance Order with penalty issued
Monitoring or reporting · Archived
Monitoring and Reporting (DBP)Violation 1303838 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start April 1, 2023 · period end June 30, 2023 · first reported September 22, 2026 · EPA return-to-compliance field June 30, 2023

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
1304785 November 14, 2025 Formal State Administrative/Compliance Order with penalty issued
Monitoring or reporting · Archived
Monitoring and Reporting (DBP)Violation 1303837 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start January 1, 2023 · period end March 31, 2023 · first reported September 22, 2026 · EPA return-to-compliance field March 31, 2023

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
1304785 November 14, 2025 Formal State Administrative/Compliance Order with penalty issued
Monitoring or reporting · Archived
Monitoring and Reporting (DBP)Violation 1303836 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start October 1, 2022 · period end December 31, 2022 · first reported September 22, 2026 · EPA return-to-compliance field December 31, 2022

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
1304785 November 14, 2025 Formal State Administrative/Compliance Order with penalty issued
Monitoring or reporting · Archived
Monitoring and Reporting (DBP)Violation 1303835 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start July 1, 2022 · period end September 30, 2022 · first reported September 22, 2026 · EPA return-to-compliance field September 30, 2022

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
1304785 November 14, 2025 Formal State Administrative/Compliance Order with penalty issued
Monitoring or reporting · Archived
Monitoring, Routine (RTCR)Violation 1303828 · Revised Total Coliform Rule · Revised Total Coliform Rule
Noncompliance period start July 1, 2022 · period end September 30, 2022 · first reported March 20, 2026 · EPA return-to-compliance field September 30, 2022

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
1304785 November 14, 2025 Formal State Administrative/Compliance Order with penalty issued
Monitoring or reporting · Archived
Monitoring and Reporting (DBP)Violation 1303834 · Chlorine · Stage 1 Disinfectants and Disinfection Byproducts Rule
Noncompliance period start April 1, 2022 · period end June 30, 2022 · first reported September 22, 2026 · EPA return-to-compliance field June 30, 2022

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
1304785 November 14, 2025 Formal State Administrative/Compliance Order with penalty issued
Monitoring or reporting · Archived
Monitoring, Routine (RTCR)Violation 1303827 · Revised Total Coliform Rule · Revised Total Coliform Rule
Noncompliance period start April 1, 2022 · period end June 30, 2022 · first reported March 20, 2026 · EPA return-to-compliance field June 30, 2022

1 linked action

Enforcement and resolution records linked by EPA
Action ID Date Category EPA action type
1304785 November 14, 2025 Formal State Administrative/Compliance Order with penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304785	November 14, 2025	Formal	State Administrative/Compliance Order with penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304785	November 14, 2025	Formal	State Administrative/Compliance Order with penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304785	November 14, 2025	Formal	State Administrative/Compliance Order with penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304785	November 14, 2025	Formal	State Administrative/Compliance Order with penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304785	November 14, 2025	Formal	State Administrative/Compliance Order with penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304785	November 14, 2025	Formal	State Administrative/Compliance Order with penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304785	November 14, 2025	Formal	State Administrative/Compliance Order with penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304785	November 14, 2025	Formal	State Administrative/Compliance Order with penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304785	November 14, 2025	Formal	State Administrative/Compliance Order with penalty issued

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304785	November 14, 2025	Formal	State Administrative/Compliance Order with penalty issued

Monitoring or reporting · Resolved

Follow-up Or Routine LCR Tap M/RViolation 1303817 · Lead and Copper Rule · Lead and Copper Rule

Noncompliance period start October 1, 2020 · period end September 28, 2023 · first reported January 5, 2021 · EPA return-to-compliance field September 28, 2023

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1304783	August 16, 2023	Informal	State Formal Notice of Violation issued
1304782	September 28, 2023	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