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Review government records associated with Mahtomedi, Minnesota.
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Preparing Mahtomedi 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 Mahtomedi, MN from EPA SDWIS.
Mahtomedi
PFAS detected below the official threshold used by this report.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 8,818 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 Mar 2024 to Sep 2024.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
PFAS detections below EPA limits.
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Mahtomedi drinking-water detections. Record names come from the source database and can be broad.
No DoD PFAS investigation records shown for this report.
EPA ATTAINS records identify assessed water bodies that do not meet water-quality standards for designated uses.
Clearwater Creek
Reported: Nov 2026
Health-relevant causes: Mercury
Affected uses: Ecological, Fishconsumption, Recreation
Data from EPA ATTAINS
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.
Washington 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.
Maintenance areas
Previously nonattainment; currently meeting the standard and monitored under an EPA maintenance plan.
Minneapolis-St. Paul Area
CO · Carbon Monoxide (1971 Standard)
Classification: Moderate <= 12.7ppm
Original designation: Nov 1990
Current design value: 2.5 ppm (2023-2025)
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Andersen School — Minneapolis, Minnesota
Annual mean: 9.0 Micrograms/cubic meter (LC)
Observation year: 2025
Anoka County Airport — Blaine, Minnesota
Annual mean: 0.1 Parts per million
Observation year: 2025
Annual mean: 0.7 Parts per billion
Observation year: 2025
Data from EPA AQS
TRI releases are self-reported annual totals (calendar year 2024). Hover fugitive or stack for definitions.
Ayrshire Electronics Mn
Reported: 2024
Reviewed: source query run Nov 2026
Reviewed: source query run Nov 2026
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
Reviewed: reporting year 2024
No MSHA mine or extraction site records shown for this report.
Washington County, MN
EPA Radon Zone Map (June 2024 release)
Washington County is EPA Radon Zone 1 (highest potential). EPA defines Zone 1 counties as having predicted average indoor screening levels above 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.
Special Flood Hazard Area — 1% annual chance of flooding (100-year floodplain). No base flood elevation determined.
Results use an earlier stored RMP inventory. Current EPA ECHO location coverage is unverified.
EPA ECHO lists facilities linked to the Risk Management Program. Results include facilities with locations that can be matched. Records may be historical. Current operations, chemical inventories, and recent accident history are unverified.
PHMSA tracks incidents involving natural gas and hazardous liquid pipelines. Incidents include leaks, ruptures, and explosions.
Recent Incidents (last 5 years)
FLINT HILLS RESOURCES, LC
Incident date: Aug 9, 2022
Data from PHMSA
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Washington County, MinnesotaPop. 275,912
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 | 4,663 | 6,117 | 7,972 |
| Poor or Fair Health | 9.8% | 11.7% | 14.2% |
| Poor Physical Health Days | 2.7 | 2.7 | 3.3 |
| Poor Mental Health Days | 4.3 | 4.3 | 4.8 |
| Adult Smoking | 12.5% | 13.9% | 15.0% |
| Adult Obesity | 30.9% | 32.4% | 34.0% |
| Air Pollution - Particulate Matter | 8.0 | 6.1 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 7.3% | 7.9% | 9.6% |
| Life Expectancy | 81.5 | 79.7 | 77.6 |
EPA testing found PFAS in water samples from Mahtomedi. Results dated Mar 12, 2024 to Sep 10, 2024 include PFBA at 0.011 to 0.021 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 Mahtomedi.
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 Mahtomedi.
The monitoring station at Andersen School, Minneapolis, Minnesota recorded an annual average of 9 Micrograms/cubic meter (LC) for fine particles (PM2.5) in 2025.
The monitoring station at Anoka County Airport, Blaine, Minnesota recorded an annual average of 0.1 Parts per million for carbon monoxide in 2025.
The monitoring station at Anoka County Airport, Blaine, Minnesota recorded an annual average of 0.7 Parts per billion for sulfur dioxide in 2025.
The radon data for Mahtomedi covers Washington County. EPA places this area in Zone 1, with a predicted average indoor radon screening level above 4 picocuries per liter.
No Superfund or brownfield sites were returned for this city report.
The county data for Mahtomedi reports a life expectancy of 81.5 years in Washington County, Minnesota.
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 Mahtomedi reports 4,663 years of life lost to deaths before age 75 per 100,000 residents in Washington County, Minnesota. 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 Mahtomedi lists fine-particle pollution (PM2.5) at 8.0 micrograms per cubic meter in Washington County, Minnesota.
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 Flint Hills Resources, Lc near Mahtomedi on Aug 9, 2022. The reported release was crude oil.