U.S. Coast Guard Training Center
What EPA’s and California’s records show in this utility’s water: nitrate, arsenic and other regulated chemicals; lead and copper; and violations since 2016, with the certification that handles each result.
- Serves
- 469 people
- Connections
- 189
- Water source
- Groundwater bought from another system
- Based in
- Petaluma, CA
- County
- Sonoma
- Owner
- Federal government
- Hardness
- Moderately hard
The ZIP code it serves
The short answer
Nothing in EPA’s and California’s records for this utility is above a health goal. That covers nitrate, arsenic and other regulated chemicals, plus lead and copper, not everything. 1 health-based violation since 2016.
What was found
Total trihalomethanes (TTHM), haloacetic acids (HAA5) and fluoride: California’s own results, samples taken from Feb. 4, 2020 to Feb. 2, 2026, with EPA’s 2012 to 2019 file for earlier years.
Below EPA’s limits2
Total trihalomethanes (TTHM)
Forms or is added in treatment
53ppb
Highest yearly average, 2020 to 2026
2026 average: 37.5 ppb
Averaged by year, the highest was 53 ppb, in 2024, below EPA’s legal limit of 80 ppb. Its highest single sample was 63 ppb. In 2026, the latest year on file, its two samples averaged 37.5 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 48.5 ppb, in 2012.
What handles it
- NSF/ANSI 53 look for “Trihalomethanes (TTHM) Reduction”
- NSF/ANSI 58 look for “Trihalomethanes (TTHM) Reduction”
Haloacetic acids (HAA5)
Forms or is added in treatment
16.9ppb
Highest yearly average, 2020 to 2026
2026 average: 14 ppb
Averaged by year, the highest was 16.9 ppb, in 2020, below EPA’s legal limit of 60 ppb. Its highest single sample was 18 ppb. In 2026, the latest year on file, its two samples averaged 14 ppb. Earlier, from 2012 to 2019, EPA’s file shows a highest yearly average of 13.8 ppb, in 2019.
What handles it
No certification claim covers this compound yet.
2 compounds tested and not foundBelow the reporting level in every sample. Not found is not the same as zero.
- Fluoride
- Lead
Hardness
Moderately hard, 110 mg/L (6.4 grains per gallon), at its one sampling point, 2022 to 2023.
Hardness is calcium and magnesium. EPA sets no limit for it: it shows up as scale on fixtures and in water heaters, and as soap that won’t lather. USGS calls water above 60 mg/L moderately hard, above 120 hard and above 180 very hard.
Violations since 2016
| Contaminant or rule | Type | Period | Measured | Status |
|---|---|---|---|---|
| Lead and Copper Rule Revisions | The required inventory of lead service lines was not completed or submitted on time.EPA: LSL Inventory | Oct. 17, 2024 | — | Unaddressed |
| Health-based violations only. Resolved and archived mean the utility returned to compliance or the state closed the record. 1 monitoring or reporting violation not shown. | ||||
What this report can’t tell you
Everything else. Total trihalomethanes (TTHM), haloacetic acids (HAA5) and fluoride results here are California’s own from 2020 on, with EPA’s national file for 2012 to 2019. U.S. Coast Guard Training Center’s own annual report, which it must send you every year, has the contaminants this page does not show.
Your own plumbing. Lead results are the 90th percentile across homes the utility samples. Your home’s service line, solder and fixtures decide yours. A certified lab test is the only way to know.
What it means for your health. This page reports what the records show and EPA’s limits and goals; it is not medical advice. If you are worried about a health effect, talk to a doctor or your local health department.
Anything after the latest data. SDWIS data is from 2026 Q3; UCMR 5 didn’t sample this utility; California’s results run from Feb. 4, 2020 to Feb. 2, 2026.
Testing your own tap
The 3 labs California certifies closest to the area U.S. Coast Guard Training Center serves, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.
Alpha Analytical Laboratories Inc. - North Bay
Petaluma, CA · about 6 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, PFAS
Brelje and Race Laboratories, Inc.
Santa Rosa, CA · about 14 miles
Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts
Sonoma County Public Health Laboratory
Santa Rosa, CA · about 16 miles
Certified for bacteria
Sources
- EPA UCMR 5 occurrence data, file of Oct. 15, 2026
- EPA SDWA bulk download (SDWIS federal data), 2026 Q3
- California State Water Resources Control Board, Division of Drinking Water, results from Jan. 1, 2020 to July 17, 2026, read Oct. 8, 2026
- EPA Six-Year Review 4 compliance monitoring data, 2012 to 2019, file of Feb. 5, 2024
- Certified labs: California State Water Resources Control Board, ELAP accredited laboratories and their fields of accreditation, read Oct. 17, 2026; distances from the Census 2020 ZIP code tabulation area gazetteer
- Hardness: California State Water Resources Control Board, Division of Drinking Water, results from July 26, 2022 to Dec. 27, 2023, read Oct. 10, 2026
- Limits and goals: each contaminant’s page, with its EPA source.
- How this page is built: methodology.
PWSID CA4910701. Rebuilt from EPA data on Oct. 18, 2026.
What to do next
- Nothing here is above a health goalIn EPA’s and California’s records for this utility. They don’t cover everything, which is why the next step matters.Every contaminant TapBuff tracks
- Get the utility’s own reportU.S. Coast Guard Training Center must send you a water quality report every year. It covers contaminants this page does not show.How to read it
- Test your own tap for leadYour service line, solder and fixtures decide the lead at your faucet, not the utility’s average.Lead in your water: what to do
- Decide if you want a filter at allA filter for taste or chlorine is a preference, not a need. The standards say what each kind can do.NSF/ANSI standards, decoded