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Sonoma County CSA 41-Jenner

Serves Jenner, Sonoma County, CA · 406 people served

Federal records show 11 health-based violations and 3 monitoring/reporting issues for Sonoma County CSA 41-Jenner in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.

  • CA4900532
  • SANTA ROSA
  • CA
  • 406 served

System profile

Source water Surface water
ZIP 95403
EPA system ID CA4900532

Verify this system on EPA ECHO →

Health-based violations, last 10 years
11
Resolved
11
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
3

Key facts

  • Sonoma County CSA 41-Jenner draws water from 1 surface water intake.
  • Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 74.5 µg/L, federal limit 60 µg/L (1.2 times the limit), 2019.
  • Most recent formal enforcement: compliance order (no penalty) by California, December 2021.
  • Record on file since 1980, with 3 health-based violations before October 19, 2016.
  • Lead pipe inventory: 0 lead and 0 unknown out of 124 service lines.

Check whether Sonoma County CSA 41-Jenner 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
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.061 mg/L, federal limit 0.06 mg/L (at or just above the limit)
 220 Jul 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.068 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
 220 Apr 1, 2020 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)
 220 Apr 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 70.75 µg/L, federal limit 60 µg/L (1.2 times the limit)
 220 Jan 1, 2020 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 89.75 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Jan 1, 2020 Resolved No
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 74.5 µg/L, federal limit 60 µg/L (1.2 times the limit)
 220 Oct 1, 2019 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 91.25 µg/L, federal limit 80 µg/L (1.1 times the limit)
 220 Oct 1, 2019 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 Jul 1, 2018 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Apr 1, 2018 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
 220 Jan 1, 2018 Resolved No
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
 220 Oct 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
Haloacetic Acids (HAA5)
Monitoring and reporting
 Jul 1, 2021 Resolved
Total Trihalomethanes (TTHMs)
Monitoring and reporting
 Jul 1, 2021 Resolved
Revised Total Coliform Rule
Monitoring violation
 May 1, 2019 Resolved

Full record since 1980

EPA's records for Sonoma County CSA 41-Jenner go back to 1980. Before October 19, 2016 they list 3 health-based violations (3 resolved) and 34 monitoring or reporting violations.

Violations that began in Health-based Monitoring and reporting
1980s 0 32
1990s 0 2
2000s 1 0
2010 to October 18, 2016 2 0
October 19, 2016 to 2019 6 1
2020s 5 2

Most recent health-based violation before October 19, 2016: Haloacetic Acids (HAA5), began October 2014, Resolved.

Show all 3 health-based violations before October 19, 2016
Contaminant Start date Status
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.074 mg/L, federal limit 0.06 mg/L (1.2 times the limit)
 Oct 1, 2014 Resolved
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.101 mg/L, federal limit 0.08 mg/L (1.3 times the limit)
 Oct 1, 2014 Resolved
Surface Water Treatment Rule
Treatment technique failure
 Jan 1, 2006 Resolved

Enforcement actions

California regulators took 7 formal enforcement actions against Sonoma County CSA 41-Jenner between 1999 and 2021. The most recent was a compliance order (no penalty) in December 2021.

Date By Action Violations covered
Dec 3, 2021 California Compliance order (no penalty) 2 violations: Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)
Feb 6, 2020 California Compliance order (no penalty) 7 violations (7 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)
Jun 21, 2019 California Compliance order (no penalty) 1 violation: Revised Total Coliform Rule
Mar 13, 2018 California Compliance order (no penalty) 4 violations (4 health-based): Total Trihalomethanes (TTHMs)
Mar 19, 2015 California Compliance order (no penalty) 2 violations (2 health-based): Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs)
Jul 13, 2010 California Compliance order (no penalty) 1 violation (1 health-based): Surface Water Treatment Rule
Sep 10, 1999 California Compliance order (no penalty) 1 violation: Surface Water Treatment Rule

What the violations mean

Total Trihalomethanes (TTHMs)

7 incidents

Disinfection byproduct levels exceeded the federal limit

Long-term TTHM exposure may increase bladder cancer risk

Haloacetic Acids (HAA5)

4 incidents

Haloacetic acid byproducts exceeded the federal limit

Long-term exposure to HAAs may increase cancer risk

Where the water comes from

Sonoma County CSA 41-Jenner draws water from 1 surface water intake.

Annual water quality report

Sonoma County CSA 41-Jenner 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 Sonoma County CSA 41-Jenner 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