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Review government records associated with Atascadero, California.
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Preparing Atascadero environmental records...
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 Atascadero, CA from EPA SDWIS.
Atascadero Mutual Water Co
PFAS above an official threshold detected in available EPA records.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 30,618 people
Data from EPA SDWIS
PFAS screening separates EPA UCMR5 drinking-water monitoring from nearby DoD PFAS investigation-site records; EPA samples shown are from Apr 2023 to Oct 2023.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
6 PFAS sample results above EPA limits
Sample period: Apr 2023 to Oct 2023
UCMR5 results are sampled by public water system, not every household. Confirm your water provider before treating these as tap-water results for a specific address.
| Chemical | Concentration (µg/L) | EPA Limit (µg/L) | Sample date | Over Limit |
|---|---|---|---|---|
| PFOS | 0.0223 | 0.0040 | 2023-10-11 | Yes |
| PFOS | 0.0210 | 0.0040 | 2023-05-30 | Yes |
| PFOA | 0.0084 | 0.0040 | 2023-05-30 | Yes |
| PFOA | 0.0074 | 0.0040 | 2023-10-11 | Yes |
| PFOS | 0.0051 | 0.0040 | 2023-10-11 | Yes |
| PFOS | 0.0047 | 0.0040 | 2023-04-19 | Yes |
PFAS detections below EPA limits.
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Atascadero drinking-water detections. Record names come from the source database and can be broad.
No DoD PFAS investigation records shown for this report.
No health-relevant impairment records shown among the assessment records in this report.
Reviewed: source records as of 2026
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.
San Luis Obispo 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
No EPA nonattainment designation records shown for this report.
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Atascadero
Annual mean: 8.3 Parts per billion
Observation year: 2025
Annual mean: 0.036 Parts per million
Observation year: 2025
Annual mean: 12.2 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.
No state cleanup site records with active investigation or remediation status surfaced nearby.
Reviewed: active/open records as of CA DTSC EnviroStor (live query)
Data from EPA ECHO
Facilities with hazardous-waste handler records under RCRA in the reviewed 5-mile city-center search area. Active handler status is separate from air, water, or other ECHO compliance violations, which are shown in their own sections.
Active RCRA handler records in the reviewed city search area
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
Sites regulated by the Mine Safety and Health Administration, including mines, sand and gravel operations, and portable crushers. Status and type are from the MSHA Mine Data Retrieval System. Records with active/intermittent status dates older than 5 years are shown as older records rather than current active sites.
More MSHA records matched the search than this preview shows.
No records shown in this group.
Reviewed: status dates within last 5 years
Data from MSHA
San Luis Obispo County, CA
EPA Radon Zone Map (June 2024 release)
San Luis Obispo County is EPA Radon Zone 2 (moderate potential). EPA defines Zone 2 counties as having predicted average indoor screening levels between 2 pCi/L and 4 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.
No FEMA flood-zone records shown for this report.
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.
PHMSA tracks incidents involving natural gas and hazardous liquid pipelines. Incidents include leaks, ruptures, and explosions.
No records dated within the last 5 years surfaced for this city report.
Reviewed: last 5 years
Data from PHMSA
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
San Luis Obispo County, CaliforniaPop. 282,013
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 | 5,707 | 6,373 | 7,972 |
| Poor or Fair Health | 14.1% | 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 | 11.7% | 8.8% | 15.0% |
| Adult Obesity | 30.5% | 27.8% | 34.0% |
| Air Pollution - Particulate Matter | 7.0 | 7.1 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 8.9% | 10.8% | 9.6% |
| Life Expectancy | 81.2 | 79.9 | 77.6 |
EPA testing found PFAS in water samples from Atascadero Mutual Water Co. Results dated Apr 19, 2023 to Oct 11, 2023 include PFOS at 0.0047 to 0.0223 micrograms per liter and PFBA at 0.0074 to 0.01 micrograms per liter.
Check with the utility that serves your address for its testing results.
The EPA drinking water records available here list no violations for Atascadero Mutual Water Co.
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 Atascadero.
The monitoring station at Atascadero recorded an annual average of 8.3 Parts per billion for nitrogen dioxide in 2025.
The monitoring station at Atascadero recorded an annual average of 0.036 Parts per million for ozone in 2025.
The monitoring station at Atascadero recorded an annual average of 12.2 Micrograms/cubic meter (25 C) for particles (PM10) in 2025.
The radon data for Atascadero covers San Luis Obispo County. EPA places this area in Zone 2, with a predicted average indoor radon screening level of 2 to 4 picocuries per liter.
No Superfund or brownfield sites were returned for this city report.
The county data for Atascadero reports a life expectancy of 81.2 years in San Luis Obispo 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 Atascadero reports 5,707 years of life lost to deaths before age 75 per 100,000 residents in San Luis Obispo 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 Atascadero lists fine-particle pollution (PM2.5) at 7.0 micrograms per cubic meter in San Luis Obispo County, California.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.
Federal pipeline records list an incident involving Southern California Gas Co near Atascadero on Mar 24, 2013. The reported release was natural gas.