Chester, PA
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.
Environmental data for Chester in Pennsylvania · Population: 540,896
Chester, PA is tracked across three EPA datasets covering 34 Toxics Release Inventory (TRI) facilities, 63 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 57/100 (Moderate Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 1.1M lbs of reported toxic releases under EPCRA Section 313, while 36 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 41 and a peak AQI of 143 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 | 264 (73%) | 96 | 3 | 143 |
| 2023 | 220 (61%) | 134 | 3 | 248 |
| 2022 | 249 (68%) | 115 | 0 | 80 |
| 2021 | 215 (62%) | 130 | 2 | 138 |
| 2020 | 233 (66%) | 121 | 1 | 143 |
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 (63)
| System | Population | Violations |
|---|---|---|
| PA AMERICAN ROYERSFORD | 46,847 | 2 |
| PA AMERICAN COATESVILLE | 36,960 | 1 |
| PHOENIXVILLE WATER DEPT | 16,599 | 2 |
| DOWNINGTOWN WATER AUTHORITY | 9,900 | 0 |
| KENNETT SQUARE MUN WATER WORKS | 6,328 | 6 |
| OXFORD BOROUGH | 5,280 | 0 |
| LONDON GROVE TWP MUN AUTH | 4,770 | 0 |
| HONEY BROOK BORO WATER | 2,892 | 2 |
| WEST GROVE BOROUGH | 2,873 | 2 |
| COMMUNITY UTILITES WESTGATE | 2,668 | 0 |
| PA AMERICAN PHOENIXVILLE | 2,661 | 0 |
| COATESVILLE VETERANS ADM HOSP | 2,000 | 0 |
| ELVERSON WATER COMPANY | 1,641 | 0 |
| BOROUGH OF ATGLEN | 1,406 | 0 |
| BOROUGH OF AVONDALE | 1,108 | 0 |
| TEL HAI RETIREMENT COMMUNITY | 930 | 0 |
| RIDGLEA | 900 | 0 |
| WESTTOWN SCHOOL | 900 | 1 |
| NOTTINGHAM MANOR M H COURT | 473 | 2 |
| CRESTWOOD COMMUNITY | 470 | 0 |
| APPLEVILLE MOBILE HOME PARK | 461 | 1 |
| SPRING RUN ESTATES WTP | 450 | 5 |
| LONGWOOD GARDENS | 440 | 2 |
| BIG SPRING TERRACE MHP | 439 | 0 |
| CAPE MAY MOBILE ESTATES | 420 | 2 |
| HILLCREST COMMUNITIES LP | 350 | 0 |
| DEVEREUX FOUNDATION BRANDYWINE | 300 | 3 |
| WETHERILL ESTATES | 250 | 8 |
| MARTINS COMMUNITY LP MHP | 180 | 0 |
| SMITHVILLE MHP | 166 | 1 |
| CHESAPEAKE ESTATES MOBILE HOME PARK | 159 | 0 |
| CAMPHILL SOLTANE | 152 | 0 |
| CAMPHILL SPEC SCH BEAVER RUN | 140 | 0 |
| STONEYHILL MHP | 124 | 7 |
| TWIN PINES HEALTH CARE CENTER | 120 | 5 |
| STONE BARN RENTALS | 120 | 2 |
| BARTON COURT | 118 | 9 |
| WINDHAVEN MHP | 112 | 0 |
| SOUTHS MOBILE HOME PARK | 110 | 0 |
| MALAGA MOBILE HOME PARK | 100 | 0 |
| CAMPHILL VILLAGE KIMBERTON HLS | 100 | 9 |
| FREEMANSBURG MHC | 90 | 2 |
| WILLIAMS MOBILE HOME PARK | 87 | 1 |
| WOODBROOKE WATER AUTHORITY | 87 | 0 |
| ROYAL OAKS MHP | 85 | 0 |
| ST MARY OF PROVIDENCE CENTER | 75 | 6 |
| WOODLAND EST MOBILE HOMES | 72 | 4 |
| KADIMA REHAB | 70 | 1 |
| LAKE RD MHP MENU MATE MUSHROOM | 65 | 2 |
| PERRY PHILLIPS MOBILE HOMES | 60 | 3 |
| SK PROPERTIES LP MISTY MEADOWS | 60 | 4 |
| LITTLE BRITAIN MHP | 60 | 2 |
| HIGHLAND COURT | 54 | 3 |
| TAYLORS MOBILE HOME PARK | 50 | 0 |
| BERKS HILL ESTATES | 50 | 5 |
| MEADOWS AT BETHEL MHP | 50 | 6 |
| PINE TERRACE MOBILE HOME PARK | 50 | 1 |
| CAMPHILL SPEC SCH BEAVER FARM | 45 | 0 |
| LENAPE HILLS TRAILER PARK | 44 | 4 |
| WARWICK MOBILE HOME PARK | 40 | 6 |
| DRUMORE MHP | 40 | 0 |
| BIG BOULDER MHP | 40 | 0 |
| DOE RUN MOBILE HOME PARK | 29 | 12 |
TRI Facilities (34)
Cities in Chester (23)
Frequently Asked Questions
What is the environmental risk level in Chester, Pennsylvania? ▼
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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.