Prince William, VA
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology.
Environmental data for Prince William in Virginia · Population: 484,625
TRI sites such as U.S. Marine Corps Base Quantico (entire Facility); Micron Technology Inc.; Possum Point Power Station; SDWIS systems such as MANASSAS PARK, CITY OF; LINTON HALL SCHOOL; ROLLING BROOK MOBILE HOME PARK; NPL sites such as Marine Corps Combat Development Command anchor Prince William, VA's EPA extract. Derived burden score 39/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
U.S. Marine Corps Base Quantico (entire Facility); Micron Technology Inc.; Possum Point Power Station are among the largest Form R filers reporting in Prince William; no SDWIS system here carries an active health-based flag. AQS median AQI 35 / peak 87 in 2024.
Burden score 39/100 (Moderate Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Prince William -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Prince William, VA: EPA TRI 2023 reporting year
Same facilities, both years
+6.3%
10 facilities that filed in 2022 and 2023
Whole inventory
+6.3%
202.4 thousand lb → 215.3 thousand lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 2 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Prince William, VA's total reported releases rose from 202.4 thousand lb in 2022 to 215.3 thousand lb in 2023, based on EPA TRI filings.
- Prince William, VA's off-site transfers rose from 2.0 thousand lb in 2022 to 3.0 thousand lb in 2023, based on EPA TRI filings.
- Prince William, VA's water releases rose from 18.9 thousand lb in 2022 to 28.0 thousand lb in 2023, based on EPA TRI filings.
- Prince William, VA's air releases fell from 52.4 thousand lb in 2022 to 47.4 thousand lb in 2023, based on EPA TRI filings.
Air Quality History (2020–2024)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2024 | 339 (93%) | 27 | 0 | 87 |
| 2023 | 329 (90%) | 33 | 3 | 129 |
| 2022 | 337 (96%) | 13 | 0 | 93 |
| 2021 | 333 (93%) | 25 | 1 | 119 |
| 2020 | 357 (98%) | 7 | 0 | 74 |
Source: EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in Virginia, see the EPA's AirNow.gov.
Water Systems (3)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| MANASSAS PARK, CITY OF | 14,051 | 0 |
| LINTON HALL SCHOOL | 350 | 0 |
| ROLLING BROOK MOBILE HOME PARK | 54 | 0 |
TRI Facilities (15)
| # | Facility | Total Releases |
|---|---|---|
| 1 | U.S. Marine Corps Base Quantico (entire Facility) | 767.8K lbs |
| 2 | Micron Technology Inc. | 225.6K lbs |
| 3 | Possum Point Power Station | 37.6K lbs |
| 4 | Manassas Broad Run Ready Mix Concrete | 746 lbs |
| 5 | Virginia Concrete Dumfries Plant | 664 lbs |
| 6 | Virginia Concrete Gainesville Plant | 633 lbs |
| 7 | Virginia Concrete Woodbridge Plant | 54 lbs |
| 8 | Safety-Kleen Systems Manassas (man) | 30 lbs |
| 9 | Bae Systems Information & Electronic Systems Integration I | 19 lbs |
| 10 | Manassas Ready Mix Concrete | 3 lbs |
| 11 | Titan Virginia Ready-Mix Llc-Dumfries Plant | 0 lbs |
| 12 | Titan Virginia Ready-Mix Llc-Copperhead Plant | 0 lbs |
| 13 | Quarles Petroleum Inc. Manassas Bulk Plant | 0 lbs |
| 14 | Gainesville Rmc Facility | 0 lbs |
| 15 | Ergon Asphalt Partners LP - Dumfries | 0 lbs |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Marine Corps Combat Development Command | NPL Site | 50.00 |
Cities in Prince William (7)
Frequently Asked Questions
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What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.