Montgomery, MD
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 Montgomery in Maryland · Population: 1,057,586
TRI sites such as Genon Mid Atlantic LLC Dickerson Generating Station; Rockville Ready Mix Concrete; U.S. Public Health Service National Institutes of Health; SDWIS systems such as TOWN OF POOLESVILLE; MCGREGOR DOWNS MHP (SC3260059); FAIRGROVE MHP anchor Montgomery, MD's EPA extract. Derived burden score 27/100 (Low 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 Montgomery include FAIRGROVE MHP; WOODBINE VILLAGE MOBILE HOME PARK; COUNTRY VILLAGE MOBILE HOME PARK, while Genon Mid Atlantic LLC Dickerson Generating Station leads reported TRI pounds among local Form R filers. AQS median AQI 40 / peak 100 in 2024.
Burden score 27/100 (Low 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 Montgomery -- 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 Montgomery, MD: EPA TRI 2023 reporting year
Same facilities, both years
-91.1%
5 facilities that filed in 2022 and 2023
Whole inventory
-91.1%
259 lb → 23 lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Montgomery, MD's total reported releases fell from 259 lb in 2022 to 23 lb in 2023, based on EPA TRI filings.
- Montgomery, MD's off-site transfers fell from 242 lb in 2022 to 0 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 | 271 (76%) | 85 | 0 | 100 |
| 2023 | 291 (82%) | 61 | 2 | 165 |
| 2022 | 241 (68%) | 113 | 1 | 119 |
| 2021 | 251 (70%) | 107 | 3 | 119 |
| 2020 | 310 (87%) | 45 | 0 | 77 |
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 Maryland, see the EPA's AirNow.gov.
Water Systems (9)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| TOWN OF POOLESVILLE | 6,005 | 0 |
| MCGREGOR DOWNS MHP (SC3260059) | 626 | 0 |
| FAIRGROVE MHP | 244 | 2 |
| WOODBINE VILLAGE MOBILE HOME PARK | 150 | 3 |
| ALTAMAHA MOBILE HOME VILLAGE | 143 | 0 |
| GRANITE MOBILE HOME PARK | 96 | 0 |
| BAILEYS MOBILE HOME PARK | 84 | 0 |
| SPRING VIEW MOBILE HOME PARK | 70 | 0 |
| COUNTRY VILLAGE MOBILE HOME PARK | 38 | 5 |
TRI Facilities (10)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Genon Mid Atlantic LLC Dickerson Generating Station | 15.7K lbs |
| 2 | Rockville Ready Mix Concrete | 958 lbs |
| 3 | U.S. Public Health Service National Institutes of Health | 638 lbs |
| 4 | Wabtec Railway Electronics | 41 lbs |
| 5 | Lafarge Mid Atlantic LLC -Rockville East Concrete | 1 lbs |
| 6 | Schuster Concrete Ready Mix Llc-Southlawn Ln | 0 lbs |
| 7 | Neutron Products Inc. | 0 lbs |
| 8 | National Institute of Standards & Technology | 0 lbs |
| 9 | McCormick Paint Works Co | 0 lbs |
| 10 | Griffith Energy Services - Damascus Fuels Plant | 0 lbs |
Cities in Montgomery (8)
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.