Suffolk, MA
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 Suffolk in Massachusetts · Population: 782,172
TRI sites such as Resilience Boston Inc.; Mystic Station; Matep LLC; SDWIS systems such as MWRA; BOSTON WATER AND SEWER COMMISSION (MWRA); REVERE WATER DIVISION (MWRA) anchor Suffolk, MA's EPA extract. Derived burden score 45/100 (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 Suffolk include BOSTON WATER AND SEWER COMMISSION (MWRA); REVERE WATER DIVISION (MWRA); CHELSEA WATER DEPT. (MWRA), while Resilience Boston Inc. leads reported TRI pounds among local Form R filers. AQS median AQI 36 / peak 78 in 2024.
Burden score 45/100 (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 Suffolk -- 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 Suffolk, MA: EPA TRI 2023 reporting year
Same facilities, both years
-19.6%
8 facilities that filed in 2022 and 2023
Whole inventory
-56.7%
37.0 thousand lb → 16.0 thousand lb, every facility that filed
Between the two reporting years, 0 facilities filed for the first time and 2 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Suffolk, MA's total reported releases fell from 19.9 thousand lb in 2022 to 16.0 thousand lb in 2023, based on EPA TRI filings.
- Suffolk, MA's water releases rose from 5 lb in 2022 to 29 lb in 2023, based on EPA TRI filings.
- Suffolk, MA's off-site transfers fell from 2.3 thousand lb in 2022 to 1.6 thousand lb in 2023, based on EPA TRI filings.
- Suffolk, MA's air releases fell from 17.6 thousand lb in 2022 to 14.4 thousand lb 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 | 291 (80%) | 75 | 0 | 78 |
| 2023 | 231 (63%) | 134 | 0 | 99 |
| 2022 | 261 (72%) | 102 | 2 | 112 |
| 2021 | 237 (65%) | 125 | 3 | 145 |
| 2020 | 229 (63%) | 137 | 0 | 84 |
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 Massachusetts, see the EPA's AirNow.gov.
Water Systems (11)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| MWRA | 2,580,000 | 0 |
| BOSTON WATER AND SEWER COMMISSION (MWRA) | 675,647 | 1 |
| REVERE WATER DIVISION (MWRA) | 62,186 | 5 |
| CHELSEA WATER DEPT. (MWRA) | 40,787 | 7 |
| WINTHROP WATER DIVISION, (MWRA) | 19,316 | 5 |
| NOQUOCHOKE VILLAGE LLC | 180 | 0 |
| WRIGHT FARM CONDOS | 160 | 0 |
| FIELDS AT SHERBORN CONDO TRUST | 110 | 0 |
| PINE ACRES CONDOS | 90 | 0 |
| BENFIELD FARMS | 50 | 0 |
| ROCKVILLE MILL HOPKINTON, LLC | 28 | 0 |
TRI Facilities (13)
| # | Facility | Total Releases |
|---|---|---|
| 1 | Resilience Boston Inc. | 97.4K lbs |
| 2 | Mystic Station | 46.4K lbs |
| 3 | Matep LLC | 39.0K lbs |
| 4 | Global Companies LLC | 23.3K lbs |
| 5 | Irving Oil Terminals Inc. | 11.4K lbs |
| 6 | Global Cos LLC - Chelsea Eastern Ave Terminal | 10.4K lbs |
| 7 | The Gillette Co LLC | 8.7K lbs |
| 8 | Boston Ship Repair LLC | 6.8K lbs |
| 9 | Houghton Chemical Corp | 5.2K lbs |
| 10 | Chelsea Sandwich LLC | 3.1K lbs |
| 11 | Tei Biosciences | 1.7K lbs |
| 12 | Boston Sand & Gravel - Charlestown Plant & Garage | 222 lbs |
| 13 | New Balance Athletic Shoe Inc | 0 lbs |
Cities in Suffolk (7)
Frequently Asked Questions
What is the environmental risk level in Suffolk, Massachusetts? ▼
Are there Superfund sites in Suffolk? ▼
How many toxic release facilities are in Suffolk? ▼
What is the air quality in Suffolk? ▼
Is the drinking water safe in Suffolk? ▼
What environmental agencies cover Suffolk? ▼
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.