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Review government records associated with Herndon, Virginia.
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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 Herndon, VA from EPA SDWIS.
Herndon, Town of
PFAS detected below the official threshold used by this report.
Reviewed: active/open records as of Q1 2026
Purchased or imported water record · Serves 24,601 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 May 2023 to Nov 2023.
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 Herndon 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.
Sugarland Run
Reported: Nov 2026
Health-relevant causes: Pathogens, Per- And Polyfluoroalkyl Substances (pfas), Polychlorinated Biphenyls (pcbs)
Affected uses: Ecological, Fishconsumption, Recreation
Data from EPA ATTAINS
NPDES permits regulate pollutant discharges into U.S. waterways. Facilities must report compliance quarterly.
Violation records
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.
Fairfax 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 designates an area as nonattainment when air quality does not meet federal health-based standards (NAAQS) for a specific pollutant.
Washington: Ozone
NonattainmentModerate8-Hour Ozone (2015 Standard)
Health effects (EPA): Respiratory inflammation, aggravation of asthma, reduced lung function (EPA)
Historical designations under the revoked 1997 ozone standard
These records describe historical designations. EPA revoked the 1997 ozone standard on April 6, 2015.
Washington Area
Historical standard: 0.08 ppm (8-hour)
Historical designation: Nonattainment (NAAQS revoked) · Subpart 2/Moderate
Original designation: Jun 2004
Open data source: EPA final revocation ruleContinuing requirements have not been verified for this area.
Data from EPA Green Book
EPA annual monitor summaries describe past measurements. For current air quality, see AirNow.
Aurora Hills Visitors Center — Arlington, Virginia
Annual mean: 0.2 Parts per million
Observation year: 2025
Annual mean: 17.7 Parts per billion
Observation year: 2025
Annual mean: 0.043 Parts per million
EPA primary exceedance count: 2 (Ozone 8-hour 2015)
Observation year: 2025
Data from EPA AQS
Facilities regulated under the Clean Air Act. CAA HPV flags indicate serious noncompliance such as exceeding emission limits.
No facility records with active violation or noncompliance flags surfaced in EPA ECHO.
Reviewed: active/open records as of Q4 2025
Data from EPA ECHO
Reviewed: source query run Nov 2026
Brownfield sites are properties where redevelopment is complicated by the presence of hazardous substances.
Open data source: Search EPA ECHO1 site with active cleanup or investigation status
Monroe Street And Young Avenue, Herndon
Reported: Feb 2026
No release reports shown in this group.
Reviewed: active/open records as of 2018
Data from EPA UST Finder
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 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.
No records shown in this group.
Reviewed: status dates within last 5 years
Data from MSHA
Fairfax County, VA
EPA Radon Zone Map (June 2024 release)
Fairfax 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.
Minimal flood hazard — outside the 1% and 0.2% annual chance floodplains.
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.
Fairfax County, VirginiaPop. 1,138,331
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 | 3,592 | 7,297 | 7,972 |
| Poor or Fair Health | 10.4% | 14.2% | 14.2% |
| Poor Physical Health Days | 2.6 | 3.2 | 3.3 |
| Poor Mental Health Days | 4.0 | 4.9 | 4.8 |
| Adult Smoking | 8.3% | 12.9% | 15.0% |
| Adult Obesity | 24.4% | 34.2% | 34.0% |
| Air Pollution - Particulate Matter | 9.1 | 7.3 | 7.3 |
| Drinking water violation indicator | No | N/A | N/A |
| Diabetes Prevalence | 8.2% | 10.2% | 9.6% |
| Life Expectancy | 84.9 | 78.1 | 77.6 |
EPA testing found PFAS in water samples from the Town of Herndon. Results dated May 16, 2023 to Nov 2, 2023 include PFBA at 0.005 to 0.0068 micrograms per liter and PFPeA at 0.0033 to 0.0039 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 the Town of Herndon.
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 Herndon.
The monitoring station at Aurora Hills Visitors Center, Arlington, Virginia recorded an annual average of 0.2 Parts per million for carbon monoxide in 2025.
The monitoring station at Aurora Hills Visitors Center, Arlington, Virginia recorded an annual average of 17.7 Parts per billion for nitrogen dioxide in 2025.
The monitoring station at Aurora Hills Visitors Center, Arlington, Virginia recorded an annual average of 0.043 Parts per million for ozone in 2025.
The radon data for Herndon covers Fairfax County. EPA places this area in Zone 1, with a predicted average indoor radon screening level above 4 picocuries per liter.
No Superfund sites were returned for this city report.
This city report shows 1 brownfield site: Herndon Wastewater Treatment Facility Bfp 025.
The county data for Herndon reports a life expectancy of 84.9 years in Fairfax County, Virginia.
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 Herndon reports 3,592 years of life lost to deaths before age 75 per 100,000 residents in Fairfax County, Virginia. 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 Herndon lists fine-particle pollution (PM2.5) at 9.1 micrograms per cubic meter in Fairfax County, Virginia.
The figure is from the 2024 edition of County Health Rankings, a University of Wisconsin program that publishes county health statistics.