Montgomery, PA
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against every other tracked county rather than against fixed national thresholds.
Environmental data for Montgomery in Pennsylvania · Population: 861,225
Montgomery, PA is tracked across three EPA datasets covering 50 Toxics Release Inventory (TRI) facilities, 50 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 71/100 (High Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 5.1M lbs of reported toxic releases under EPCRA Section 313, while 19 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 40 and a peak AQI of 140 in 2024, with 73% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
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 | 266 (73%) | 98 | 1 | 140 |
| 2023 | 232 (64%) | 127 | 1 | 284 |
| 2022 | 237 (65%) | 124 | 1 | 108 |
| 2021 | 202 (57%) | 148 | 6 | 150 |
| 2020 | 269 (73%) | 97 | 0 | 99 |
Source: EPA Air Quality System (AQS) Annual AQI by County 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 Pennsylvania, see the EPA's AirNow.gov.
Water Systems (50)
| System | Population | Violations |
|---|---|---|
| NORTH PENN WATER AUTHORITY | 91,941 | 0 |
| PA AMERICAN NORRISTOWN | 88,885 | 0 |
| NORTH WALES WATER AUTHORITY | 72,496 | 0 |
| POTTSTOWN BOROUGH WATER AUTH | 36,000 | 6 |
| HORSHAM WATER&SEWER AUTHORITY | 26,000 | 2 |
| NWWA WARRINGTON TOWNSHIP | 21,588 | 3 |
| AMBLER BORO WATER DEPT | 20,000 | 0 |
| COLLEGEVILLE TRAPPE JOINT PWD | 8,470 | 2 |
| PA AMERICAN AUDUBON | 8,200 | 0 |
| TELFORD BOROUGH AUTHORITY | 7,700 | 0 |
| SCHWENKSVILLE BOROUGH AUTH | 5,200 | 1 |
| UPPER HANOVER WATER AUTHORITY | 4,600 | 0 |
| E GREENVILLE BORO WATER DEPT | 3,100 | 1 |
| NORTH COVENTRY WATER SYSTEM | 2,907 | 4 |
| RED HILL WATER AUTHORITY | 2,500 | 0 |
| VILLAGE OF NESHAMINY FALLS | 1,300 | 0 |
| PARKHOUSE NURSING & REHAB CTR | 1,200 | 2 |
| NWWA OLDE COLONIAL GREENE | 900 | 0 |
| AQUA PA WHITE ROCK ACRES SYS | 790 | 3 |
| MT VILLAGE MHP | 771 | 0 |
| HEREFORD EST MHP | 710 | 0 |
| NWWA PINE RUN | 700 | 0 |
| FREDERICK LIVING | 640 | 0 |
| PERKIOMEN CROSSING | 508 | 0 |
| AQUA PA LINKS AT GETTYSBURG SY | 398 | 0 |
| AVANTE APARTMENTS | 315 | 0 |
| AWC VALLEY FORGE CROSSING MHP | 250 | 0 |
| HILLTOP MOBILE ESTATES | 220 | 0 |
| CREEKVIEW MHP | 200 | 3 |
| YERKES WATER ASSOCIATION | 165 | 9 |
| NWWA DURHAM VILLAGE | 160 | 1 |
| SPRUCE COURT APARTMENTS | 139 | 0 |
| OAK GROVE PARK MHP | 130 | 0 |
| HARRISONVILLE MOBILE HOME PARK | 100 | 0 |
| WARWICK WATER WORKS | 98 | 7 |
| NWWA YORKSHIRE MEADOWS | 90 | 0 |
| WOODED RIDGE DEVELOPMENT | 90 | 1 |
| SITTLERS MHP | 89 | 10 |
| FAIRMOUNT MHP, L.P. | 80 | 1 |
| NWWA HERMITAGE | 75 | 0 |
| HYLAND MHP | 75 | 1 |
| DOCK WOODS COMMUNITY | 72 | 0 |
| PAW BERRY HOLLOW | 70 | 0 |
| WOODLAND MHP | 61 | 0 |
| QUAKER VIEW MOBILE HOME PARK | 60 | 6 |
| SAINT LUKE KNOLLS | 50 | 0 |
| BEAVER RUN WATER ASSOCIATION | 50 | 0 |
| EMERY COVE ESTATES | 48 | 0 |
| COUNTRY HILLS APTS | 40 | 0 |
| WEC INTERNATIONAL | 25 | 8 |
TRI Facilities (50)
Cities in Montgomery (33)
Frequently Asked Questions
What is the environmental risk level in Montgomery, Pennsylvania? ▼
Are there Superfund sites in Montgomery? ▼
How many toxic release facilities are in Montgomery? ▼
What is the air quality in Montgomery? ▼
Is the drinking water safe in Montgomery? ▼
What environmental agencies cover Montgomery? ▼
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.