CA1900100 · California

METTLER VALLEY MUTUAL

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

Violation records shown: 13
EPA health-based flag: 13
Health-based records unresolved in this snapshot: 0
Monitoring and reporting records: 0

Counties listed by EPA · Los Angeles 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

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600032 · Arsenic · Arsenic Rule

Noncompliance period start April 1, 2024 · period end June 30, 2024 · first reported August 15, 2024 · EPA return-to-compliance field June 30, 2024

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600031 · Arsenic · Arsenic Rule

Noncompliance period start January 1, 2024 · period end March 31, 2024 · first reported May 15, 2024 · EPA return-to-compliance field March 31, 2024

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600030 · Arsenic · Arsenic Rule

Noncompliance period start July 1, 2023 · period end September 30, 2023 · first reported February 15, 2024 · EPA return-to-compliance field September 30, 2023

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600029 · Arsenic · Arsenic Rule

Noncompliance period start April 1, 2023 · period end June 30, 2023 · first reported February 15, 2024 · EPA return-to-compliance field June 30, 2023

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600028 · Arsenic · Arsenic Rule

Noncompliance period start January 1, 2023 · period end March 31, 2023 · first reported February 15, 2024 · EPA return-to-compliance field March 31, 2023

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600027 · Arsenic · Arsenic Rule

Noncompliance period start October 1, 2022 · period end December 31, 2022 · first reported February 15, 2024 · EPA return-to-compliance field December 31, 2022

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600026 · Arsenic · Arsenic Rule

Noncompliance period start July 1, 2022 · period end September 30, 2022 · first reported February 15, 2024 · EPA return-to-compliance field September 30, 2022

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600025 · Arsenic · Arsenic Rule

Noncompliance period start April 1, 2022 · period end June 30, 2022 · first reported February 15, 2024 · 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
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600024 · Arsenic · Arsenic Rule

Noncompliance period start January 1, 2022 · period end March 31, 2022 · first reported February 15, 2024 · EPA return-to-compliance field March 31, 2022

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600022 · Arsenic · Arsenic Rule

Noncompliance period start October 1, 2021 · period end December 31, 2021 · first reported February 16, 2022 · EPA return-to-compliance field December 31, 2021

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600023 · Arsenic · Arsenic Rule

Noncompliance period start July 1, 2021 · period end September 30, 2021 · first reported February 15, 2024 · EPA return-to-compliance field September 30, 2021

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600021 · Arsenic · Arsenic Rule

Noncompliance period start January 1, 2021 · period end March 31, 2021 · first reported May 14, 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
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

EPA health-based flag · Archived

Maximum Contaminant Level Violation, AverageViolation 1600020 · Arsenic · Arsenic Rule

Noncompliance period start October 1, 2020 · period end December 31, 2020 · first reported May 14, 2021 · EPA return-to-compliance field December 31, 2020

2 linked actions

Enforcement and resolution records linked by EPA
Action ID	Date	Category	EPA action type
1500035	April 9, 2015	Formal	State Administrative/Compliance Order without penalty issued
9999900000000000001	August 23, 2019	Formal	Federal Final Administrative Order issued

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