Mercer, NJ
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 Mercer in New Jersey · Population: 383,286
TRI sites such as B-Way Packaging Inc; E R Squibb & Sons LLC; Hovione Nj Facility Expansion; SDWIS systems such as TRENTON WATER WORKS; AQUA NJ - BLACKWOOD; AQUA NJ - HAMILTON SQUARE; NPL sites such as Historic Potteries anchor Mercer, NJ's EPA extract. Derived burden score 42/100 (Moderate 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 Mercer include TRENTON WATER WORKS; AQUA NJ - BLACKWOOD; EAST WINDSOR MUA, while B-Way Packaging Inc leads reported TRI pounds among local Form R filers. AQS median AQI 43 / peak 133 in 2024.
Burden score 42/100 (Moderate 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 Mercer -- 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 Mercer, NJ: EPA TRI 2023 reporting year
Same facilities, both years
+53.3%
9 facilities that filed in 2022 and 2023
Whole inventory
+53.3%
10.4 thousand lb → 15.9 thousand lb, every facility that filed
- Mercer, NJ's total reported releases rose from 10.4 thousand lb in 2022 to 15.9 thousand lb in 2023, based on EPA TRI filings.
- Mercer, NJ's off-site transfers rose from 2.9 thousand lb in 2022 to 11.8 thousand lb in 2023, based on EPA TRI filings.
- Mercer, NJ's air releases fell from 7.5 thousand lb in 2022 to 4.2 thousand lb in 2023, based on EPA TRI filings.
- Mercer, NJ's chemicals reported rose from 19 in 2022 to 20 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 | 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 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 (37)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| TRENTON WATER WORKS | 217,000 | 24 |
| 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 |
| MAPLE SHADE WATER DEPARTMENT | 19,400 | 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 |
| ALBERT C WAGNER YOUTH CO | 2,500 | 0 |
| HOPEWELL BORO W DEPT | 2,035 | 5 |
| 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 |
| TUXEDO RESERVE | 600 | 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 (10)
| # | 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 |
| 10 | Pflaumer Brothers Inc | 0 lbs |
Superfund Sites (1)
| Site Name | Status | HRS Score |
|---|---|---|
| Historic Potteries | NPL Site | 49.13 |
Cities in Mercer (13)
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.