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Colusa Co. WWD #1 - Grimes

Serves Grimes, Colusa County, CA · 512 people served

Federal records show 33 health-based violations and 8 monitoring/reporting issues for Colusa Co. WWD #1 - Grimes in the last ten years. The most serious issue in this window was a Arsenic violation that EPA lists as archived, not resolved.

  • CA0600008
  • GRIMES
  • CA
  • 512 served

System profile

Source water Groundwater
ZIP 95950
EPA system ID CA0600008

Verify this system on EPA ECHO →

Health-based violations, last 10 years
33
Resolved
0
Unresolved
0
Archived by EPA
33
Any acute record
No
Monitoring issues, last 10 years
8

Key facts

  • Colusa Co. WWD #1 - Grimes 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, 26.5 µg/L, federal limit 10 µg/L (2.7 times the limit), 2023.
  • Most recent formal enforcement: compliance order (no penalty) by California, December 2023.
  • Record on file since 1980, with 29 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 98 service lines.

Check whether Colusa Co. WWD #1 - Grimes serves your address

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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 23.5 µg/L, federal limit 10 µg/L (2.4 times the limit)
 330 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
Measured 23.6 µg/L, federal limit 10 µg/L (2.4 times the limit)
 330 Jul 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 22.4 µg/L, federal limit 10 µg/L (2.2 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 22.9 µg/L, federal limit 10 µg/L (2.3 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 22.9 µg/L, federal limit 10 µg/L (2.3 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
Arsenic
Contaminant limit exceeded
Measured 25.3 µg/L, federal limit 10 µg/L (2.5 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
Arsenic
Contaminant limit exceeded
Measured 25.9 µg/L, federal limit 10 µg/L (2.6 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 26.5 µg/L, federal limit 10 µg/L (2.7 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 26.2 µg/L, federal limit 10 µg/L (2.6 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 25.4 µg/L, federal limit 10 µg/L (2.5 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 25 µg/L, federal limit 10 µg/L (2.5 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 22.7 µg/L, federal limit 10 µg/L (2.3 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
Measured 23.8 µg/L, federal limit 10 µg/L (2.4 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 24.9 µg/L, federal limit 10 µg/L (2.5 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 23.6 µg/L, federal limit 10 µg/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 24.6 µg/L, federal limit 10 µg/L (2.5 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 22.8 µg/L, federal limit 10 µg/L (2.3 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 23.5 µg/L, federal limit 10 µg/L (2.4 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
Measured 24.1 µg/L, federal limit 10 µg/L (2.4 times the limit)
 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 22.2 µg/L, federal limit 10 µg/L (2.2 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 22.7 µg/L, federal limit 10 µg/L (2.3 times the limit)
 330 Oct 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 23.5 µg/L, federal limit 10 µg/L (2.4 times the limit)
 330 Jul 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 23 µg/L, federal limit 10 µg/L (2.3 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
Arsenic
Contaminant limit exceeded
Measured 20.8 µg/L, federal limit 10 µg/L (2.1 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
Arsenic
Contaminant limit exceeded
Measured 20.4 µg/L, federal limit 10 µg/L (2 times the limit)
 330 Oct 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 23.9 µg/L, federal limit 10 µg/L (2.4 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 25.1 µg/L, federal limit 10 µg/L (2.5 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 23 µg/L, federal limit 10 µg/L (2.3 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 24 µg/L, federal limit 10 µg/L (2.4 times the limit)
 330 Oct 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 26 µg/L, federal limit 10 µg/L (2.6 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 24 µg/L, federal limit 10 µg/L (2.4 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 25 µg/L, federal limit 10 µg/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 24 µg/L, federal limit 10 µg/L (2.4 times the limit)
 330 Oct 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
Monitoring and reporting
 Oct 1, 2025 Active
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2023 Resolved
Revised Total Coliform Rule
Monitoring violation
 Nov 1, 2022 Resolved
Revised Total Coliform Rule
Monitoring violation
 Oct 1, 2021 Resolved
Revised Total Coliform Rule
Monitoring violation
 Dec 1, 2020 Resolved
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2017 Resolved
Nitrate
Monitoring and reporting
 Jan 1, 2017 Resolved
Lead and Copper Rule
Monitoring and reporting
 Oct 1, 2015 Resolved

Full record since 1980

EPA's records for Colusa Co. WWD #1 - Grimes go back to 1980. Before October 19, 2016 they list 29 health-based violations (25 resolved, 4 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
2000s 3 0
2010 to October 18, 2016 26 1
October 19, 2016 to 2019 12 2
2020s 20 5

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

Show all 29 health-based violations before October 19, 2016
Contaminant Start date Status
Arsenic
Contaminant limit exceeded
Measured 24 µg/L, federal limit 10 µg/L (2.4 times the limit)
 Oct 1, 2016 Archived
Arsenic
Contaminant limit exceeded
Measured 24 µg/L, federal limit 10 µg/L (2.4 times the limit)
 Jul 1, 2016 Archived
Arsenic
Contaminant limit exceeded
Measured 24 µg/L, federal limit 10 µg/L (2.4 times the limit)
 Apr 1, 2016 Archived
Arsenic
Contaminant limit exceeded
Measured 24 µg/L, federal limit 10 µg/L (2.4 times the limit)
 Jan 1, 2016 Archived
Arsenic
Contaminant limit exceeded
Measured 24 µg/L, federal limit 10 µg/L (2.4 times the limit)
 Oct 1, 2015 Resolved
Arsenic
Contaminant limit exceeded
Measured 24 µg/L, federal limit 10 µg/L (2.4 times the limit)
 Apr 1, 2015 Resolved
Arsenic
Contaminant limit exceeded
Measured 23.8 µg/L, federal limit 10 µg/L (2.4 times the limit)
 Jan 1, 2015 Resolved
Arsenic
Contaminant limit exceeded
Measured 23.6 µg/L, federal limit 10 µg/L (2.4 times the limit)
 Oct 1, 2014 Resolved
Arsenic
Contaminant limit exceeded
Measured 24.1 µg/L, federal limit 10 µg/L (2.4 times the limit)
 Jul 1, 2014 Resolved
Arsenic
Contaminant limit exceeded
Measured 24.3 µg/L, federal limit 10 µg/L (2.4 times the limit)
 Jan 1, 2014 Resolved
Arsenic
Contaminant limit exceeded
Measured 24.6 µg/L, federal limit 10 µg/L (2.5 times the limit)
 Oct 1, 2013 Resolved
Arsenic
Contaminant limit exceeded
Measured 25.2 µg/L, federal limit 10 µg/L (2.5 times the limit)
 Jul 1, 2013 Resolved
Arsenic
Contaminant limit exceeded
Measured 24.6 µg/L, federal limit 10 µg/L (2.5 times the limit)
 Apr 1, 2013 Resolved
Arsenic
Contaminant limit exceeded
Measured 24.7 µg/L, federal limit 10 µg/L (2.5 times the limit)
 Jan 1, 2013 Resolved
Arsenic
Contaminant limit exceeded
Measured 25.6 µg/L, federal limit 10 µg/L (2.6 times the limit)
 Oct 1, 2012 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.0258 mg/L, federal limit 0.01 mg/L (2.6 times the limit)
 Jul 1, 2012 Resolved
Arsenic
Contaminant limit exceeded
Measured 25.8 µg/L, federal limit 10 µg/L (2.6 times the limit)
 Apr 1, 2012 Resolved
Arsenic
Contaminant limit exceeded
Measured 26.1 µg/L, federal limit 10 µg/L (2.6 times the limit)
 Jan 1, 2012 Resolved
Arsenic
Contaminant limit exceeded
Measured 25.3 µg/L, federal limit 10 µg/L (2.5 times the limit)
 Oct 1, 2011 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.026 mg/L, federal limit 0.01 mg/L (2.6 times the limit)
 Jul 1, 2011 Resolved
Arsenic
Contaminant limit exceeded
Measured 26.1 µg/L, federal limit 10 µg/L (2.6 times the limit)
 Apr 1, 2011 Resolved
Arsenic
Contaminant limit exceeded
Measured 26.8 µg/L, federal limit 10 µg/L (2.7 times the limit)
 Jan 1, 2011 Resolved
Arsenic
Contaminant limit exceeded
Measured 25.6 µg/L, federal limit 10 µg/L (2.6 times the limit)
 Oct 1, 2010 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.027 mg/L, federal limit 0.01 mg/L (2.7 times the limit)
 Jul 1, 2010 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.0269 mg/L, federal limit 0.01 mg/L (2.7 times the limit)
 Apr 1, 2010 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.027 mg/L, federal limit 0.01 mg/L (2.7 times the limit)
 Jan 1, 2010 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.0259 mg/L, federal limit 0.01 mg/L (2.6 times the limit)
 Oct 1, 2009 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.0259 mg/L, federal limit 0.01 mg/L (2.6 times the limit)
 Jul 1, 2009 Resolved
Arsenic
Contaminant limit exceeded
Measured 0.0255 mg/L, federal limit 0.01 mg/L (2.6 times the limit)
 Apr 1, 2009 Resolved

Enforcement actions

California regulators took 6 formal enforcement actions against Colusa Co. WWD #1 - Grimes between 2009 and 2023. The most recent was a compliance order (no penalty) in December 2023.

Date By Action Violations covered
Dec 21, 2023 California Compliance order (no penalty) 1 violation: Lead and Copper Rule
Dec 13, 2022 California Compliance order (no penalty) 1 violation: Revised Total Coliform Rule
Jun 14, 2018 California Compliance order (no penalty) 4 violations (4 health-based): Arsenic
Jun 4, 2018 California Compliance order (no penalty) 1 violation: Nitrate
Mar 7, 2018 California Compliance order (no penalty) 2 violations: Lead and Copper Rule
Jan 5, 2009 California Compliance order (no penalty) 60 violations (60 health-based): Arsenic

What the violations mean

Arsenic

33 incidents

Arsenic exceeded the federal limit

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

Where the water comes from

Colusa Co. WWD #1 - Grimes draws water from 2 wells (1 of them for emergency, seasonal or other part-time use).

Annual water quality report

Colusa Co. WWD #1 - Grimes 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