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Preparing Gaithersburg environmental records...
Review government records associated with Gaithersburg, Maryland. Open a section to see source records, coverage and dates. These city-level results do not establish exposure at a home or identify your water provider.
Toxin Scout summarizes public records from government and public datasets. Data can be delayed, incomplete, approximate, matched at non-parcel levels, or have accuracy problems as a result of this product's beta status, so verify important findings against the linked source records.
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Preparing Gaithersburg environmental records...
Counts describe the records shown, not a complete city inventory. Some sources include nearby locations.
Drinking water compliance, PFAS records, natural water body health, discharge permits, and water-quality monitoring records for Gaithersburg.
Public water-system records for Gaithersburg, MD from EPA SDWIS.
Town of Poolesville
PFAS above an official threshold detected in available EPA records.
Reviewed: active/open records as of Q1 2026
City-area ZIP code · Serves 6,005 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 Feb 2023 to Nov 2025.
Drinking Water PFAS Monitoring
EPA UCMR5 samples public water systems. These results are separate from nearby PFAS cleanup or investigation-site records.
16 PFAS sample results above EPA limits
Sample period: Feb 2023 to Aug 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 | 0.0065 | 0.0040 | 2023-08-08 | Yes |
| PFOS | 0.0065 | 0.0040 | 2023-08-08 | Yes |
| PFOS | 0.0060 | 0.0040 | 2023-08-08 | Yes |
| PFOS | 0.0056 | 0.0040 | 2023-02-07 | Yes |
| PFOA | 0.0054 | 0.0040 | 2023-02-07 | Yes |
| PFOS | 0.0054 | 0.0040 | 2023-02-07 | Yes |
| PFOA | 0.0054 | 0.0040 | 2023-08-08 | Yes |
| PFOA | 0.0053 | 0.0040 | 2023-08-08 | Yes |
| PFOS | 0.0053 | 0.0040 | 2023-02-07 | Yes |
| PFOA | 0.0052 | 0.0040 | 2023-08-08 | Yes |
| PFOA | 0.0051 | 0.0040 | 2023-02-07 | Yes |
| PFOA | 0.0048 | 0.0040 | 2023-08-08 | Yes |
| PFOA | 0.0047 | 0.0040 | 2023-02-07 | Yes |
| PFOS | 0.0045 | 0.0040 | 2023-02-07 | Yes |
| PFOA | 0.0041 | 0.0040 | 2023-02-07 | Yes |
| PFOA | 0.0041 | 0.0040 | 2023-08-08 | Yes |
PFAS detections below EPA limits.
Nearby PFAS Investigation Sites
DoD records are nearby site investigations, not Gaithersburg drinking-water detections. Record names come from the source database and can be broad.
No DoD PFAS investigation records shown for this report.
Water Body Impairment (ATTAINS) city records are temporarily unavailable.
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
No NPDES-permitted facility records with violations surfaced for this city report.
Reviewed: active/open records as of Q4 2025
Data from EPA ECHO
Reviewed: source records as of 2026
Air quality data from EPA monitoring stations, facility emissions inventories, and area-level air-quality designations in this city.
Montgomery County
Reported: Dec 2020
EPA national average is ~30 per million
According to EPA, a cancer risk of 40-in-1-million means that for every 1 million people continuously exposed to these air toxics over a 70-year lifetime, an estimated 40 may develop cancer from that exposure. This is in addition to cancer risk from all other causes.
Top local emission sources
Data from EPA AirToxScreen
Air Quality Nonattainment Areas city records are temporarily unavailable.
Beltsville
Annual mean: 0.045 ppm · EPA standard: 0.07 ppm
Annual standard context: 2 exceedance days recorded in the reporting period
Reported: 2024
Aurora Hills Visitors Center — Arlington, Virginia
Annual mean: 0.2 ppm · EPA standard: 9 ppm
Reported: 2024
Annual mean: 6.5 μg/m³ · EPA standard: 9 μg/m³
Annual standard context: 6 exceedance days recorded in the reporting period
Reported: 2024
Data from EPA AQS
Reviewed: source records as of Q4 2025
Reviewed: source records as of 2024
Contaminated sites, waste facilities, cleanup records, and industrial operations in this city.
Reviewed: source query run Oct 2026
Reviewed: source query run Oct 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
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
Reviewed: reporting year 2024
Formerly 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 FUDSReported: Oct 2026
No MSHA mine or extraction site records shown for this report.
Montgomery County, MD
Reported: Mar 2026
Montgomery 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.
Flood-map status, chemical accident risk, nuclear facilities, pipeline incidents, and community health indicators in this city.
No FEMA flood-zone records shown for this report.
Health outcomes from County Health Rankings. Values shown alongside state and national averages.
Montgomery County, MarylandPop. 1,052,521
Reported: Mar 2026
Premature Death
Poor or Fair Health
Poor Physical Health Days
Poor Mental Health Days
Adult Smoking
Adult Obesity
Air Pollution - Particulate Matter
Drinking Water Violations
Diabetes Prevalence
Life Expectancy
| Indicator | County | State | National |
|---|---|---|---|
| Premature Death | 4,629 | 7,921 | 7,972 |
| Poor or Fair Health | 11.4% | 13.1% | 14.2% |
| Poor Physical Health Days | 2.6 | 2.8 | 3.3 |
| Poor Mental Health Days | 4.4 | 4.4 | 4.8 |
| Adult Smoking | 8.5% | 10.2% | 15.0% |
| Adult Obesity | 24.7% | 34.2% | 34.0% |
| Air Pollution - Particulate Matter | 6.1 | 7.3 | 7.3 |
| Drinking Water Violations | 0 | 0 | N/A |
| Diabetes Prevalence | 7.9% | 9.8% | 9.6% |
| Life Expectancy | 83.5 | 78.0 | 77.6 |