Mercer, NJ
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 New Jersey · Population: 383,286
Mercer, NJ is tracked across three EPA datasets covering 9 Toxics Release Inventory (TRI) facilities, 34 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 36/100 (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 60.7K lbs of reported toxic releases under EPCRA Section 313, while 8 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 43 and a peak AQI of 133 in 2024, with 67% 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 | 246 (67%) | 115 | 5 | 133 |
| 2023 | 194 (53%) | 160 | 6 | 244 |
| 2022 | 227 (62%) | 135 | 3 | 119 |
| 2021 | 193 (53%) | 165 | 7 | 130 |
| 2020 | 262 (72%) | 101 | 3 | 112 |
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 New Jersey, see the EPA's AirNow.gov.
Water Systems (34)
| System | Population | Violations |
|---|---|---|
| TRENTON WATER WORKS | 217,000 | 23 |
| AQUA NJ - BLACKWOOD | 44,396 | 1 |
| AQUA NJ - HAMILTON SQUARE | 39,128 | 0 |
| AQUA NJ - PHILLIPSBURG | 26,686 | 0 |
| EAST WINDSOR MUA | 25,000 | 3 |
| AQUA NJ - EASTERN DIVISION | 12,000 | 0 |
| AQUA NJ - LAWRENCE | 8,655 | 0 |
| AQUA NJ - WOOLWICH | 6,271 | 0 |
| HIGHTSTOWN WATER DEPARTMENT | 5,400 | 0 |
| PENNINGTON W DEPT | 2,600 | 0 |
| HOPEWELL BORO W DEPT | 2,035 | 4 |
| ALLENTOWN WATER DEPT | 2,000 | 0 |
| LAWRENCEVILLE SCHOOL | 1,200 | 1 |
| AQUA NJ - WALLKILL | 1,050 | 0 |
| AQUA NJ - CALIFON | 936 | 0 |
| ROOSEVELT WATER DEPT | 880 | 0 |
| AQUA NJ - RIEGEL RIDGE | 621 | 0 |
| AQUA NJ - TRANQUILITY SPRINGS | 599 | 2 |
| AQUA NJ - SPARTAN VILLAGE | 594 | 0 |
| AQUA NJ - VERNON | 515 | 0 |
| WASHINGTON CROSSING PARK ESTATES | 356 | 0 |
| AQUA NJ - SEAVIEW HARBOR | 300 | 0 |
| AQUA NJ - CALIFORNIA VILLAGE | 300 | 0 |
| ROBBINSVILLE TWP - NEWTOWN VILLAGE | 300 | 0 |
| AQUA NJ - HANOVER MOBILE VILLAGE | 285 | 0 |
| AQUA NJ - BUNNVALE | 252 | 0 |
| AQUA NJ - BEAR BROOK | 226 | 1 |
| AQUA NJ - WARREN GLEN | 192 | 0 |
| AQUA NJ - SUMMIT LAKE | 177 | 0 |
| AQUA NJ - FOX HILL | 172 | 0 |
| AQUA NJ - BRAINARDS | 135 | 0 |
| AQUA NJ CLIFFSIDE PARK | 80 | 1 |
| AQUA NJ - RIEGELSVILLE | 62 | 0 |
| AQUA NJ - HARKERS HOLLOW | 40 | 0 |
TRI Facilities (9)
| # | Facility | Total Releases |
|---|---|---|
| 1 | B-Way Packaging Inc | 34.6K lbs |
| 2 | E R Squibb & Sons LLC | 20.8K lbs |
| 3 | Hovione Nj Facility Expansion | 3.7K lbs |
| 4 | Webtech Inc | 1.2K lbs |
| 5 | Roller Bearing Co. of America | 483 lbs |
| 6 | Trane Co | 4 lbs |
| 7 | Ralph Clayton & Sons | 1 lbs |
| 8 | R.e. Carroll Inc. | 0 lbs |
| 9 | Andrea Aromatics Inc | 0 lbs |
Cities in Mercer (5)
Frequently Asked Questions
What is the environmental risk level in Mercer, New Jersey? ▼
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.