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Review government records associated with Helena, Montana.
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Preparing Helena 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 Helena, MT from EPA SDWIS.
Helena Water System
No active drinking-water issues detected in EPA SDWIS.
Reviewed: active/open records as of Q1 2026
City listed in EPA records · Serves 32,091 people
Data from EPA SDWIS
PFAS screening separates EPA UCMR5 drinking-water monitoring from nearby DoD PFAS investigation-site records.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
No EPA UCMR5 PFAS detection records shown for these water systems.
Reviewed: source records as of Q1 2026
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Helena drinking-water detections. Record names come from the source database and can be broad.
Helena Aviation Readiness Center - Aasf
Army · National Guard
Suspected PFAS record
Remedial investigation underway
Estimated investigation end date: 2035-09
No health-relevant impairment records shown among the assessment records in this report.
Reviewed: source records as of 2026
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
Violation records
Last inspected: Dec 2025
Last inspected: Dec 2025
Data from EPA ECHO
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.
Lewis and Clark County
Assessment year: 2020
According to EPA, a cancer risk of 20-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 20 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.
Ncore - Sieben Flats
Annual mean: 0.1 Parts per million
Observation year: 2025
Annual mean: 0.8 Parts per billion
Observation year: 2025
Annual mean: 0.042 Parts per million
Observation year: 2025
Data from EPA AQS
Reviewed: source records as of Q4 2025
TRI releases are self-reported annual totals (calendar year 2024). Hover fugitive or stack for definitions.
American Chemet Corp
Reported: 2024
EPA records for current, proposed and formerly listed Superfund sites on the National Priorities List (NPL).
Open data source: Search EPA ECHOEPA FRS Registry ID 110060398341
Reported: Nov 2021
Brownfield sites are properties where redevelopment is complicated by the presence of hazardous substances.
Open data source: Search EPA ECHO2 sites with active cleanup or investigation status
357 Cruse Ave, Helena
Reported: Feb 2026
811 Hoback St, Helena
Reported: Feb 2026
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
Release reports
Reported: Dec 2021
Data from EPA UST Finder
Toxics Release Inventory data — chemicals disposed on-site at reporting facilities.
US Army National Guard Fort Harrison Ranges
Open data source: View EPA TRI facility recordFormerly Used Defense Sites are properties previously owned by, leased to, or otherwise possessed by the United States and under the jurisdiction of the Secretary of Defense. The FUDS program addresses environmental restoration at these properties.
Open data source: USACE FUDSSites 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
Lewis and Clark County, MT
EPA Radon Zone Map (June 2024 release)
Lewis and Clark 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.
No FEMA flood-zone records shown for this report.
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.
Reviewed: 2000-present
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Lewis and Clark County, MontanaPop. 73,832
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 | 6,958 | 8,418 | 7,972 |
| Poor or Fair Health | 11.7% | 13.7% | 14.2% |
| Poor Physical Health Days | 3.2 | 3.6 | 3.3 |
| Poor Mental Health Days | 4.6 | 4.9 | 4.8 |
| Adult Smoking | 13.3% | 15.3% | 15.0% |
| Adult Obesity | 30.5% | 31.8% | 34.0% |
| Air Pollution - Particulate Matter | 8.7 | 4.6 | 7.3 |
| Drinking water violation indicator | Yes | N/A | N/A |
| Diabetes Prevalence | 7.2% | 7.6% | 9.6% |
| Life Expectancy | 78.4 | 77.2 | 77.6 |
This report does not have PFAS sample results for the candidate water systems in Helena.
Check with the utility that serves your address for its testing results.
EPA drinking water records on this page list 3 violations for Helena Water System.
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 Helena.
The monitoring station at NCORE-Sieben Flats recorded an annual average of 0.1 Parts per million for carbon monoxide in 2025.
The monitoring station at NCORE-Sieben Flats recorded an annual average of 0.8 Parts per billion for sulfur dioxide in 2025.
The monitoring station at NCORE-Sieben Flats recorded an annual average of 0.042 Parts per million for ozone in 2025.
The radon data for Helena covers Lewis and Clark County. EPA places this area in Zone 1, with a predicted average indoor radon screening level above 4 picocuries per liter.
This city report shows 1 Superfund site: East Helena Site.
This city report shows 3 brownfield sites: 6th Ward Park; 7th Ave Gym; 811 Hoback St.
View on EPA ECHOView on EPA ECHOView on EPA ECHOView on EPA ECHO
The county data for Helena reports a life expectancy of 78.4 years in Lewis and Clark County, Montana.
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 Helena reports 6,958 years of life lost to deaths before age 75 per 100,000 residents in Lewis and Clark County, Montana. 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 Helena lists fine-particle pollution (PM2.5) at 8.7 micrograms per cubic meter in Lewis and Clark County, Montana.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.