Public water system record

Sierra Linda Mutual Water Co

Serves North Fork, Madera County, CA · 200 people served

Federal records show 52 health-based violations and 1 monitoring/reporting issue for Sierra Linda Mutual Water Co in the last ten years, including an unresolved LEAD AND COPPER RULE REVISIONS violation.

CA2000506
NORTH FORK
CA
200 served

System profile

Source water Groundwater

ZIP 93643

EPA system ID CA2000506

Verify this system on EPA ECHO →

Health-based violations, last 10 years: 52
Resolved: 0
Unresolved: 1
Archived by EPA: 51
Any acute record: No
Monitoring issues, last 10 years: 1

Key facts

Sierra Linda Mutual Water Co draws water from 4 wells.
Highest measured level in the last 10 years: Arsenic, 0.03525 mg/L, federal limit 0.01 mg/L (3.5 times the limit), 2023.
Most recent formal enforcement: compliance order (no penalty) by California, June 2015.
Record on file since 1980, with 32 health-based violations before October 19, 2016.
Lead pipe inventory: 0 lead and 82 unknown out of 82 service lines.

Check whether Sierra Linda Mutual Water Co serves your address

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
Combined Uranium Contaminant limit exceeded	340	Oct 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.02375 mg/L, federal limit 0.01 mg/L (2.4 times the limit)	330	Oct 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	Jul 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	330	Jul 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	Apr 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.024 mg/L, federal limit 0.01 mg/L (2.4 times the limit)	330	Apr 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	Jan 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.024 mg/L, federal limit 0.01 mg/L (2.4 times the limit)	330	Jan 1, 2025	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
LEAD AND COPPER RULE REVISIONS Treatment technique failure	350	Oct 17, 2024	Active	No
Combined Uranium Contaminant limit exceeded	340	Oct 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	330	Oct 1, 2024	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	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 21.125 µg/L, federal limit 10 µg/L (2.1 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
Combined Uranium Contaminant limit exceeded	340	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 29 µg/L, federal limit 10 µg/L (2.9 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
Combined Uranium Contaminant limit exceeded	340	Oct 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 0.03025 mg/L, federal limit 0.01 mg/L (3 times the limit)	330	Oct 1, 2023	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	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 0.035 mg/L, federal limit 0.01 mg/L (3.5 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
Combined Uranium Contaminant limit exceeded	340	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 0.03525 mg/L, federal limit 0.01 mg/L (3.5 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 35.25 µg/L, federal limit 10 µg/L (3.5 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
Combined Uranium Contaminant limit exceeded	340	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 0.0335 mg/L, federal limit 0.01 mg/L (3.4 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 10.1 µg/L, federal limit 10 µg/L (at or just above 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 11 µg/L, federal limit 10 µg/L (1.1 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	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 18 µg/L, federal limit 10 µg/L (1.8 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 Measured 28 µg/L, federal limit 10 µg/L (2.8 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 Measured 0.012 mg/L, federal limit 0.01 mg/L (1.2 times the limit)	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 0.031 mg/L, federal limit 0.01 mg/L (3.1 times the limit)	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 0.011 mg/L, federal limit 0.01 mg/L (1.1 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 0.029 mg/L, federal limit 0.01 mg/L (2.9 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 0.012 mg/L, federal limit 0.01 mg/L (1.2 times the limit)	330	Apr 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 0.024 mg/L, federal limit 0.01 mg/L (2.4 times the limit)	330	Apr 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 0.011 mg/L, federal limit 0.01 mg/L (1.1 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 0.03 mg/L, federal limit 0.01 mg/L (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 0.016 mg/L, federal limit 0.01 mg/L (1.6 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
Combined Uranium Contaminant limit exceeded	340	Apr 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	Apr 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.022 mg/L, federal limit 0.01 mg/L (2.2 times the limit)	330	Apr 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	Jan 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	Jan 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	330	Jan 1, 2019	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	Jan 1, 2018	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	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 0.024 mg/L, federal limit 0.01 mg/L (2.4 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
Combined Uranium Contaminant limit exceeded	340	Jan 1, 2017	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	Jan 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 0.025 mg/L, federal limit 0.01 mg/L (2.5 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
Arsenic Contaminant limit exceeded Measured 0.029 mg/L, federal limit 0.01 mg/L (2.9 times the limit)	330	Jan 1, 2016	Archived Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.	No
Combined Uranium Contaminant limit exceeded	340	Jan 1, 2016	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 REVISIONS RPT	Oct 17, 2024	Active

Full record since 1980

EPA's records for Sierra Linda Mutual Water Co go back to 1980. Before October 19, 2016 they list 32 health-based violations (2 resolved, 30 archived by EPA without a recorded fix) and 3 monitoring or reporting violations.

Violations that began in	Health-based	Monitoring and reporting
1980s	0	2
1990s	0	1
2000s	7	0
2010 to October 18, 2016	25	0
October 19, 2016 to 2019	12	0
2020s	38	1

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

Show all 32 health-based violations before October 19, 2016

Contaminant	Start date	Status
Arsenic Contaminant limit exceeded Measured 0.029 mg/L, federal limit 0.01 mg/L (2.9 times the limit)	Jan 1, 2016	Archived
Combined Uranium Contaminant limit exceeded	Jan 1, 2016	Archived
Arsenic Contaminant limit exceeded Measured 0.027 mg/L, federal limit 0.01 mg/L (2.7 times the limit)	Jan 1, 2015	Archived
Combined Uranium Contaminant limit exceeded	Jan 1, 2015	Archived
Combined Uranium Contaminant limit exceeded	Jan 1, 2014	Archived
Combined Uranium Contaminant limit exceeded	Jan 1, 2014	Archived
Arsenic Contaminant limit exceeded Measured 0.033 mg/L, federal limit 0.01 mg/L (3.3 times the limit)	Jan 1, 2014	Archived
Total Coliform (acute) Contaminant limit exceeded	Sep 1, 2013	Resolved
Arsenic Contaminant limit exceeded Measured 0.03 mg/L, federal limit 0.01 mg/L (3 times the limit)	Jan 1, 2013	Archived
Arsenic Contaminant limit exceeded	Oct 1, 2012	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Jul 1, 2012	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Apr 1, 2012	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Jan 1, 2012	Archived
Total Coliform Contaminant limit exceeded	Nov 1, 2011	Resolved
Combined Uranium Contaminant limit exceeded	Oct 1, 2011	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Oct 1, 2011	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Jul 1, 2011	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Apr 1, 2011	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Jan 1, 2011	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Oct 1, 2010	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Jul 1, 2010	Archived
Combined Uranium Contaminant limit exceeded	Apr 1, 2010	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Apr 1, 2010	Archived
Combined Uranium Contaminant limit exceeded	Jan 1, 2010	Archived
Arsenic Contaminant limit exceeded Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Jan 1, 2010	Archived
Arsenic Contaminant limit exceeded Measured 0.0249 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Oct 1, 2009	Archived
Arsenic Contaminant limit exceeded Measured 0.0249 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Jul 1, 2009	Archived
Arsenic Contaminant limit exceeded Measured 0.0249 mg/L, federal limit 0.01 mg/L (2.5 times the limit)	Apr 1, 2009	Archived
Arsenic Contaminant limit exceeded Measured 0.023 mg/L, federal limit 0.01 mg/L (2.3 times the limit)	Jan 1, 2009	Archived
Combined Uranium Contaminant limit exceeded	Jan 1, 2009	Archived
Arsenic Contaminant limit exceeded Measured 0.023 mg/L, federal limit 0.01 mg/L (2.3 times the limit)	Oct 1, 2007	Archived
Combined Uranium Contaminant limit exceeded	Jan 1, 2007	Archived

Enforcement actions

California regulators took 2 formal enforcement actions against Sierra Linda Mutual Water Co between 2014 and 2015. The most recent was a compliance order (no penalty) in June 2015.

Date	By	Action	Violations covered
Jun 10, 2015	California	Compliance order (no penalty)	74 violations (74 health-based): Arsenic, Combined Uranium
Aug 12, 2014	California	Compliance order (no penalty)	30 violations (30 health-based): Arsenic, Combined Uranium

What the violations mean

Arsenic

31 incidents

Arsenic exceeded the federal limit

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

Combined Uranium

20 incidents

Test results for Combined Uranium were above the federal limit (a maximum contaminant level violation).

The utility had to notify customers about each of these violations.

LEAD AND COPPER RULE REVISIONS

1 incident

The system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Sierra Linda Mutual Water Co draws water from 4 wells.

Annual water quality report

Sierra Linda Mutual Water Co 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 Sierra Linda Mutual Water Co 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

Lead pipes

Total service lines reported	82
Lead pipes confirmed	0
Galvanized pipes needing replacement	0
Pipes with unknown material	82
Non-lead pipes confirmed	0
Pipes that may be lead or unknown	100.0% (82)
Inventory submitted	Oct 16, 2024
EPA reporting status	Reported all required service line types

Lines of unknown material count as possible lead until the utility identifies them.

Verify on EPA SDWIS EPA Get the Lead Out guidance