Mercer, 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 Mercer in Pennsylvania · Population: 109,852
Mercer, PA is tracked across three EPA datasets covering 33 Toxics Release Inventory (TRI) facilities, 29 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 61/100 (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 2.1M lbs of reported toxic releases under EPCRA Section 313, while 12 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 97 in 2024, with 75% 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 | 274 (75%) | 92 | 0 | 97 |
| 2023 | 237 (65%) | 122 | 3 | 196 |
| 2022 | 288 (79%) | 74 | 3 | 136 |
| 2021 | 277 (76%) | 85 | 1 | 112 |
| 2020 | 272 (74%) | 93 | 1 | 105 |
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 (29)
| System | Population | Violations |
|---|---|---|
| AQUA PA SHENANGO VALLEY WTP | 48,000 | 0 |
| GREENVILLE MUNI WATER AUTH | 8,600 | 1 |
| GROVE CITY BORO WATER DEPT | 7,871 | 0 |
| SHARPSVILLE BORO WATER CO | 5,029 | 0 |
| NEW WILMINGTON BORO WATER DEPT | 4,500 | 0 |
| AQUA PA JENKS TWP WTP | 4,320 | 0 |
| AQUA PA INC TREASURE LAKE DIV | 4,155 | 1 |
| PINE TWP WATER DISTR SYSTEM | 3,082 | 0 |
| REYNOLDS WATER COMPANY | 2,370 | 16 |
| AQUA PA CRAWFORD DIV | 2,300 | 0 |
| BUHL COMMUNITY WATER COMPANY | 2,227 | 1 |
| AQUA PA LAKE LATONKA WTP | 1,600 | 6 |
| BARKEYVILLE MUN AUTHORITY | 1,600 | 0 |
| SANDY LAKE BORO | 1,100 | 0 |
| MAHONING TOWNSHIP | 1,032 | 0 |
| ST PAUL HOMES | 1,000 | 0 |
| AQUA PA MT JEWETT | 972 | 2 |
| STONEBORO WATER WORKS | 956 | 0 |
| AQUA PA CLARENDON | 840 | 52 |
| SOUTH PYMATUNING | 641 | 0 |
| FRYBURG WATER COMPANY | 490 | 1 |
| WEST HICKORY WATER COMPANY | 450 | 0 |
| FREDONIA BORO | 443 | 3 |
| PINE GROVE MOBILE HOME PARK | 244 | 5 |
| GREENVILLE MHP | 150 | 0 |
| LIBERTY TOWNSHIP | 138 | 0 |
| SUNNYVIEW MOBILE HOME PARK | 88 | 2 |
| GRANDVIEW ACRES MHP | 70 | 0 |
| GREYSTONE COUNTRY ESTATES | 55 | 2 |
TRI Facilities (33)
Cities in Mercer (14)
Frequently Asked Questions
What is the environmental risk level in Mercer, Pennsylvania? ▼
Are there Superfund sites in Mercer? ▼
How many toxic release facilities are in Mercer? ▼
What is the air quality in Mercer? ▼
Is the drinking water safe in Mercer? ▼
What environmental agencies cover Mercer? ▼
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.