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Public water system record

Mettler Valley Mutual

Serves an area of Los Angeles County, CA · 160 people served

Federal records show 22 health-based violations and 1 monitoring/reporting issue for Mettler Valley Mutual in the last ten years. The most serious issue in this window was a Arsenic violation that EPA lists as archived, not resolved.

  • CA1900100
  • LANCASTER
  • CA
  • 160 served

System profile

Source water Groundwater
ZIP 93536
EPA system ID CA1900100

Verify this system on EPA ECHO →

Health-based violations, last 10 years
22
Resolved
0
Unresolved
0
Archived by EPA
22
Any acute record
No
Monitoring issues, last 10 years
1

Key facts

  • Mettler Valley Mutual draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).
  • Highest measured level in the last 10 years: Arsenic, 16 µg/L, federal limit 10 µg/L (1.6 times the limit), 2018.
  • Most recent formal enforcement: compliance order (no penalty) by EPA, August 2019.
  • Record on file since 1980, with 10 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 98 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
Arsenic
Contaminant limit exceeded
Measured 13 µg/L, federal limit 10 µg/L (1.3 times the limit)
 330 Apr 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 13 µg/L, federal limit 10 µg/L (1.3 times the limit)
 330 Jan 1, 2024 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 12 µg/L, federal limit 10 µg/L (1.2 times the limit)
 330 Jul 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 13 µg/L, federal limit 10 µg/L (1.3 times the limit)
 330 Apr 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 11 µg/L, federal limit 10 µg/L (1.1 times the limit)
 330 Jan 1, 2023 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 14 µg/L, federal limit 10 µg/L (1.4 times the limit)
 330 Oct 1, 2022 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 14 µg/L, federal limit 10 µg/L (1.4 times the limit)
 330 Jul 1, 2022 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 13 µg/L, federal limit 10 µg/L (1.3 times the limit)
 330 Apr 1, 2022 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 13 µg/L, federal limit 10 µg/L (1.3 times the limit)
 330 Jan 1, 2022 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
 330 Oct 1, 2021 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 13 µg/L, federal limit 10 µg/L (1.3 times the limit)
 330 Jul 1, 2021 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 13 µg/L, federal limit 10 µg/L (1.3 times the limit)
 330 Jan 1, 2021 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 13 µg/L, federal limit 10 µg/L (1.3 times the limit)
 330 Oct 1, 2020 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 14 µg/L, federal limit 10 µg/L (1.4 times the limit)
 330 Jul 1, 2020 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
 330 Apr 1, 2020 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 15 µg/L, federal limit 10 µg/L (1.5 times the limit)
 330 Jan 1, 2020 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 15 µg/L, federal limit 10 µg/L (1.5 times the limit)
 330 Jul 1, 2018 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 14 µg/L, federal limit 10 µg/L (1.4 times the limit)
 330 Apr 1, 2018 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 16 µg/L, federal limit 10 µg/L (1.6 times the limit)
 330 Jan 1, 2018 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 15 µg/L, federal limit 10 µg/L (1.5 times the limit)
 330 Jul 1, 2017 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 15 µg/L, federal limit 10 µg/L (1.5 times the limit)
 330 Apr 1, 2017 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No
Arsenic
Contaminant limit exceeded
Measured 15 µg/L, federal limit 10 µg/L (1.5 times the limit)
 330 Jan 1, 2017 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
 No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2018 Resolved

Full record since 1980

EPA's records for Mettler Valley Mutual go back to 1980. Before October 19, 2016 they list 10 health-based violations (1 resolved, 9 archived by EPA without a recorded fix) and 7 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1980s 0 5
1990s 0 1
2010 to October 18, 2016 10 1
October 19, 2016 to 2019 6 1
2020s 16 0

Most recent health-based violation before October 19, 2016: Arsenic, began April 2016, Archived.

Show all 10 health-based violations before October 19, 2016
Contaminant Start date Status
Arsenic
Contaminant limit exceeded
Measured 0.013 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
 Apr 1, 2016 Archived
Arsenic
Contaminant limit exceeded
Measured 0.014 mg/L, federal limit 0.01 mg/L (1.4 times the limit)
 Jan 1, 2016 Archived
Arsenic
Contaminant limit exceeded
Measured 0.013 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
 Oct 1, 2015 Archived
Arsenic
Contaminant limit exceeded
Measured 0.012 mg/L, federal limit 0.01 mg/L (1.2 times the limit)
 Jul 1, 2015 Archived
Arsenic
Contaminant limit exceeded
Measured 0.013 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
 Apr 1, 2015 Archived
Arsenic
Contaminant limit exceeded
Measured 0.013 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
 Jan 1, 2015 Archived
Arsenic
Contaminant limit exceeded
 Oct 1, 2014 Archived
Arsenic
Contaminant limit exceeded
Measured 0.0135 mg/L, federal limit 0.01 mg/L (1.4 times the limit)
 Jul 1, 2014 Archived
Arsenic
Contaminant limit exceeded
Measured 0.013 mg/L, federal limit 0.01 mg/L (1.3 times the limit)
 Apr 1, 2014 Archived
Total Coliform (acute)
Contaminant limit exceeded
 Jul 1, 2012 Resolved

Enforcement actions

California regulators and EPA took 4 formal enforcement actions against Mettler Valley Mutual between 2012 and 2019. The most recent was a compliance order (no penalty) in August 2019.

Date By Action Violations covered
Aug 23, 2019 EPA Compliance order (no penalty) 31 violations (31 health-based): Arsenic
Apr 9, 2015 California Compliance order (no penalty) 31 violations (31 health-based): Arsenic
May 1, 2013 California Compliance order (no penalty) 1 violation: Total Coliform
Nov 19, 2012 California Compliance order (no penalty) 1 violation (1 health-based): Total Coliform

What the violations mean

Arsenic

22 incidents

Arsenic exceeded the federal limit

Long-term arsenic exposure is linked to cancer and cardiovascular effects

Where the water comes from

Mettler Valley Mutual draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).

Annual water quality report

Mettler Valley Mutual must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Mettler Valley Mutual for a copy.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by California.

Certified drinking water labs by state EPA guidance for private wells