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Review government records associated with Sebastopol, California.
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Check your water bill for your utility name and confirm the reporting year. See EPA’s guide to finding your annual water quality report.
Public water-system records for Sebastopol, CA from EPA SDWIS.
Sebastopol, City of
No active drinking-water issues detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 7,522 people
Data from EPA SDWIS
Reviewed: source records as of Q1 2026
EPA UCMR5 — No PFAS detection records shown for these water systems
Open data source: EPA UCMR5DoD PFAS — No investigation records shown for this report
Open data source: DoD PFASEPA ATTAINS records identify assessed water bodies that do not meet water-quality standards for designated uses.
Lower Laguna De Santa Rosa
Reported: Nov 2026
Health-relevant causes: Mercury, Pathogens
Affected uses: Drinkingwater, Ecological, Fishconsumption, Other, Recreation
Data from EPA ATTAINS
Reviewed: source records as of Q4 2025
To investigate water contamination, check the sampling locations, dates and results below. For tap water records, see Drinking water quality above.
Reviewed: source records as of 2026
Review historical EPA air pollution records, including monitoring and facility emissions where available. For current conditions, check local air quality on AirNow.
Sonoma County
Assessment year: 2020
According to EPA, a cancer risk of 30-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 30 may develop cancer from that exposure. This is in addition to cancer risk from all other causes.
Top modeled source groups
Data from EPA AirToxScreen
EPA designations apply to a specific pollutant and federal air quality standard (NAAQS). EPA can issue a clean-data determination while a formal designation remains in effect.
San Francisco Bay Area: Ozone
NonattainmentMarginal8-Hour Ozone (2015 Standard)
Original designation: Aug 2018
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
San Francisco Bay Area: PM2.5
NonattainmentModeratePM-2.5 (2006 Standard)
Original designation: Dec 2009
Health effects (EPA): Cardiovascular disease, respiratory illness, premature death (EPA)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Guerneville-Church and 1St
Annual mean: 9.0 Micrograms/cubic meter (25 C)
Observation year: 2025
Healdsburg-Matheson
Annual mean: 9.8 Micrograms/cubic meter (25 C)
Observation year: 2025
Data from EPA AQS
Reviewed: source records as of Q4 2025
Reviewed: source query run Nov 2026
Reviewed: source query run Nov 2026
State environmental agencies maintain cleanup site databases that include state Superfund, voluntary cleanup, and brownfield remediation programs. These programs track additional sites beyond those on the federal NPL.
1 site with active cleanup or investigation
1009-1011 Gravenstein Highway, Sebastopol
1.1 miles away · SONOMA County
Reported: Nov 2026
Data from EPA ECHO
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
No MSHA mine or extraction site records shown for this report.
Sonoma County, CA
EPA Radon Zone Map (June 2024 release)
Sonoma County is EPA Radon Zone 3 (low potential). EPA defines Zone 3 counties as having predicted average indoor screening levels below 2 pCi/L.
Radon levels can vary from home to home, so EPA recommends testing the property to know its indoor level.
FEMA flood zones describe mapped flood hazards. Look up a specific address with FEMA.
Special Flood Hazard Area — 1% annual chance of flooding (100-year floodplain) with base flood elevation.
Results use an earlier stored RMP inventory. Current EPA ECHO location coverage is unverified.
No EPA ECHO RMP facility records with a usable location matched this city report.
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Sonoma County, CaliforniaPop. 482,650
County Health Rankings edition: 2024
Premature Death
Poor or Fair Health
Poor Physical Health Days
Poor Mental Health Days
Adult Smoking
Adult Obesity
Air Pollution - Particulate Matter
Drinking water violation indicator
Diabetes Prevalence
Life Expectancy
| Indicator | County | State | National |
|---|---|---|---|
| Premature Death | 5,764 | 6,373 | 7,972 |
| Poor or Fair Health | 14.0% | 15.8% | 14.2% |
| Poor Physical Health Days | 3.4 | 3.1 | 3.3 |
| Poor Mental Health Days | 5.1 | 4.7 | 4.8 |
| Adult Smoking | 11.0% | 8.8% | 15.0% |
| Adult Obesity | 28.6% | 27.8% | 34.0% |
| Air Pollution - Particulate Matter | 5.7 | 7.1 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 8.4% | 10.8% | 9.6% |
| Life Expectancy | 81.1 | 79.9 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Sebastopol.
Check with the utility that serves your address for its testing results.
The EPA drinking water records available here list no violations for the City of Sebastopol.
Check your water bill to identify the utility serving your address. Ask that utility about current drinking water advisories.
Nearby EPA monitoring stations provide annual air quality measurements for Sebastopol.
The monitoring station at Guerneville-Church and 1st recorded an annual average of 9 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The monitoring station at Healdsburg-Matheson recorded an annual average of 9.8 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The radon data for Sebastopol covers Sonoma County. EPA places this area in Zone 3, with a predicted average indoor radon screening level below 2 picocuries per liter.
No Superfund or brownfield sites were returned for this city report.
The county data for Sebastopol reports a life expectancy of 81.1 years in Sonoma County, California.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Sebastopol reports 5,764 years of life lost to deaths before age 75 per 100,000 residents in Sonoma County, California. This measure adds up the years lost to early deaths and adjusts for differences in population age.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
The county data for Sebastopol lists fine-particle pollution (PM2.5) at 5.7 micrograms per cubic meter in Sonoma County, California.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.