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Public water system record

City of Plymouth

Serves Plymouth, Amador County, CA · 1,060 people served

Federal records show 2 health-based violations and 4 monitoring/reporting issues for City of Plymouth in the last ten years. The most serious issue in this window was a resolved Total Trihalomethanes (TTHMs) violation.

  • CA0310004
  • PLYMOUTH
  • CA
  • 1,060 served

System profile

Source water Purchased surface water
ZIP 95669
EPA system ID CA0310004

Verify this system on EPA ECHO →

Health-based violations, last 10 years
2
Resolved
2
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
4

Key facts

  • City of Plymouth buys its water from Awa, Tanner.
  • Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit), 2021.
  • Most recent formal enforcement: compliance order (no penalty) by California, December 2021.
  • Record on file since 1993, with 2 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 605 unknown out of 901 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
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Oct 1, 2021 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.081 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Apr 1, 2017 Resolved 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
 Jul 2, 2025 Active
Revised Total Coliform Rule
Monitoring violation
 Aug 1, 2017 Resolved
Revised Total Coliform Rule
Monitoring violation
 Jun 1, 2017 Resolved
Revised Total Coliform Rule
Monitoring violation
 Dec 1, 2016 Resolved

Full record since 1993

EPA's records for City of Plymouth go back to 1993. Before October 19, 2016 they list 2 health-based violations (2 resolved) and 18 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 2 11
2000s 0 6
2010 to October 18, 2016 0 1
October 19, 2016 to 2019 1 3
2020s 1 1

Most recent health-based violation before October 19, 2016: Total Coliform, began July 1994, Resolved.

Show all 2 health-based violations before October 19, 2016
Contaminant Start date Status
Total Coliform
Contaminant limit exceeded
 Jul 1, 1994 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Jul 1, 1993 Resolved

Enforcement actions

California regulators took 9 formal enforcement actions against City of Plymouth between 2001 and 2021, filed as 10 records in EPA's data. The most recent was a compliance order (no penalty) in December 2021.

Date By Action Violations covered
Dec 10, 2021 California Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Sep 7, 2017 California Compliance order (no penalty) 1 violation: Revised Total Coliform Rule
Aug 3, 2017 California Compliance order (no penalty) 1 violation (1 health-based): Total Trihalomethanes (TTHMs)
Jul 20, 2017 California Compliance order (no penalty) 1 violation: Revised Total Coliform Rule
Jan 27, 2017 California Compliance order (no penalty) 1 violation: Revised Total Coliform Rule
May 18, 2016 California Compliance order (no penalty) 1 violation: Revised Total Coliform Rule
Apr 15, 2005 California Compliance order (no penalty) 2 violations: Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)
Nov 20, 2001 California Compliance order (no penalty) 1 violation: Consumer Confidence Rule
Jul 31, 2001 California Compliance order (no penalty) 12 violations: Nitrite, Nitrate-Nitrite, Nitrate

What the violations mean

Total Trihalomethanes (TTHMs)

2 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Where the water comes from

City of Plymouth buys its water from Awa, Tanner. It lists no wells or intakes of its own.

Buys water from

Annual water quality report

City of Plymouth 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.

Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.

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