Loudoun, 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 Loudoun in Virginia · Population: 427,082
TRI sites such as Ttm Technologies N.a. Llc.; Menzies Aviation Fueling Operations Wash Dulles Internationa; Virginia Concrete Dulles Plant; SDWIS systems such as PURCELLVILLE, TOWN OF; LOVETTSVILLE, TOWN OF; HAMILTON, TOWN OF; NPL sites such as Hidden Lane Landfill anchor Loudoun, VA's EPA extract. Derived burden score 44/100 (Moderate Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Loudoun include FOXCROFT SCHOOL; NORTH SPRING BEHAVIORAL HEALTHCARE; HILLSBORO, TOWN OF, while Ttm Technologies N.a. Llc. leads reported TRI pounds among local Form R filers. AQS median AQI 43 / peak 87 in 2024.
Burden score 44/100 (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 Loudoun -- 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 Loudoun, VA: EPA TRI 2023 reporting year
Same facilities, both years
-51.9%
11 facilities that filed in 2022 and 2023
Whole inventory
-51.9%
14.3 thousand lb → 6.9 thousand lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Loudoun, VA's total reported releases fell from 14.3 thousand lb in 2022 to 6.9 thousand lb in 2023, based on EPA TRI filings.
- Loudoun, VA's air releases fell from 8.6 thousand lb in 2022 to 2.0 thousand lb in 2023, based on EPA TRI filings.
- Loudoun, VA's water releases fell from 1.2 thousand lb in 2022 to 821 lb in 2023, based on EPA TRI filings.
- Loudoun, VA's chemicals reported fell from 22 in 2022 to 19 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 | 245 (67%) | 121 | 0 | 87 |
| 2023 | 306 (84%) | 54 | 2 | 167 |
| 2022 | 328 (90%) | 34 | 2 | 112 |
| 2021 | 308 (85%) | 55 | 1 | 122 |
| 2020 | 339 (93%) | 26 | 1 | 108 |
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 (7)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| PURCELLVILLE, TOWN OF | 8,929 | 0 |
| LOVETTSVILLE, TOWN OF | 2,964 | 0 |
| HAMILTON, TOWN OF | 2,240 | 0 |
| FOXCROFT SCHOOL | 301 | 9 |
| NORTH SPRING BEHAVIORAL HEALTHCARE | 225 | 2 |
| HILLSBORO, TOWN OF | 88 | 5 |
| ALDIE WATER COMPANY | 70 | 1 |
TRI Facilities (16)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Ttm Technologies N.a. Llc. | 42.5K lbs |
| 2 | Menzies Aviation Fueling Operations Wash Dulles Internationa | 9.1K lbs |
| 3 | Virginia Concrete Dulles Plant | 2.1K lbs |
| 4 | Superior Concrete Materials Inc. - Dulles | 1.6K lbs |
| 5 | Virginia Concrete Cochran Mill | 1.3K lbs |
| 6 | Virginia Concrete Co Inc-Chantilly | 805 lbs |
| 7 | Dowty a Ge Aerospace Co | 365 lbs |
| 8 | US Dhs Mt Weather Eoc | 8 lbs |
| 9 | Chantilly Ready Mix Concrete | 5 lbs |
| 10 | Virginia Paving Co | 1 lbs |
| 11 | Titan Virginia Ready-Mix Llc-Sterling Plant | 0 lbs |
| 12 | Titan Virginia Ready-Mix Llc-Leesburg Plant | 0 lbs |
| 13 | Virginia Concrete Sterling Plant | 0 lbs |
| 14 | Electronic Instrumentation & Technology LLC | 0 lbs |
| 15 | Virginia Concrete Bull Run | 0 lbs |
| 16 | Virginia Paving Co - Chantilly Plant | 0 lbs |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Hidden Lane Landfill | NPL Site | 50.00 |
Cities in Loudoun (11)
Frequently Asked Questions
What is the environmental risk level in Loudoun, Virginia? ▼
Are there Superfund sites in Loudoun? ▼
How many toxic release facilities are in Loudoun? ▼
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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.