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Public water system record

Thermalito Water & Sewer Dist

Serves an area of Butte County, CA that includes Oroville and Thermalito · 12,136 people served

Federal records show 1 health-based violation and 1 monitoring/reporting issue for Thermalito Water & Sewer Dist in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.

  • CA0410008
  • OROVILLE
  • CA
  • 12,136 served

System profile

Source water Surface water
ZIP 95965
EPA system ID CA0410008

Verify this system on EPA ECHO →

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

Key facts

  • Thermalito Water & Sewer Dist draws water from 4 wells and 1 surface water intake.
  • Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 62.6 µg/L, federal limit 60 µg/L (at or just above the limit), 2020.
  • Most recent formal enforcement: compliance order (no penalty) by California, March 2020.
  • Record on file since 1993, with 1 health-based violation before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 3,139 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
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 62.6 µg/L, federal limit 60 µg/L (at or just above the limit)
 220 Apr 1, 2020 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
Monitoring and reporting
 Oct 1, 2022 Resolved

Full record since 1993

EPA's records for Thermalito Water & Sewer Dist go back to 1993. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 3 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1990s 0 1
2000s 1 2
2020s 1 1

Most recent health-based violation before October 19, 2016: Total Coliform, began May 2005, Resolved.

Show the health-based violation before October 19, 2016
Contaminant Start date Status
Total Coliform
Contaminant limit exceeded
 May 1, 2005 Resolved

Enforcement actions

California regulators took 1 formal enforcement action against Thermalito Water & Sewer Dist in 2020. The most recent was a compliance order (no penalty) in March 2020.

Date By Action Violations covered
Mar 17, 2020 California Compliance order (no penalty) 2 violations (1 health-based): Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5)

What the violations mean

Haloacetic Acids (HAA5)

1 incident

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Where the water comes from

Thermalito Water & Sewer Dist draws water from 4 wells and 1 surface water intake.

Annual water quality report

Thermalito Water & Sewer Dist 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 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.

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