Environmental compliance · county

Environmental compliance in Middlesex County

8,137 active EPA-regulated sites in Middlesex County, Massachusetts: 164 with an identified violation, 56 in significant violation, 808 inspections and $9.1 million in penalties over five years — EPA ECHO, as of October 18, 2026.

Cite: FACTANKER, https://factanker.com/us/ma/middlesex-county/environmental-compliance

How many facilities in Middlesex County, Massachusetts are regulated by the EPA, and how many are in violation (as of October 18, 2026)?

Measure	Value
Active EPA-regulated sites	8,137
Sites with an identified violation	164
Sites in significant violation	56
Inspections and evaluations, last 5 years	808
Formal enforcement actions, last 5 years	293
Penalties, last 5 years (shared federal cases once)	$9.1 million

How many active facilities in Middlesex County, Massachusetts fall under each EPA program?

A facility can be in several programs.

Program	Active sites
Air (Clean Air Act)	916
Water discharge permits (Clean Water Act, NPDES)	1,880
Hazardous waste (RCRA)	6,110
Drinking water systems (SDWA)	209
Toxics Release Inventory reporters	69
Greenhouse gas reporters (GHGRP)	10

Which large facilities in Middlesex County, Massachusetts does the EPA track, and are they in violation?

Facility	Compliance status	Quarters in violation (of 12)	Penalties, 5 years
AYER WASTEWATER TREATMENT FACILITY Ayer, MA	Significant Violation	12	–
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Cambridge, MA	Significant Violation	11	–
MURPHY WASTE OIL SERVICE Woburn, MA	Significant Violation	9	$33,688
REGIONAL WASTEWATER TREATMENT FACILITY Lowell, MA	Violation Identified	12	$200,000
SUNNY DELIGHT BEVERAGES PLANT Littleton, MA	Violation Identified	12	–
HUDSON W W T F Hudson, MA	Violation Identified	10	–
BILLERICA WASTEWATER TREATMENT FACILITY Billerica, MA	Violation Identified	7	–
CONCORD WASTEWATER TREATMENT FACILITY Concord, MA	Violation Identified	6	–
TENNESSEE GAS PIPELINE Hopkinton, MA	No Violation Identified	3	–
TRIUMVIRATE ENVIRONMENTAL MERRIMACK INC Lowell, MA	No Violation Identified	3	–
MARLBOROUGH DPW WATER DIVISION EAST PLT Marlborough, MA	Violation Identified	2	–
DISTRIGAS LNG FACILITY Everett, MA	No Violation Identified	1	–
WESTERLY WASTEWATER TREATMENT FACILITY Marlborough, MA	No Violation Identified	1	–
BOSTON COLLEGE HEATING PLANT Newton (Chestnut Hill), MA	No Violation Identified	0	–
CAMBRIDGE CITY - CSOS Cambridge, MA	No Violation Identified	0	–
EXELON POWER GENERATING STATION Framingham, MA	No Violation Identified	0	–
EXXONMOBIL EVERETT TERMINAL Everett, MA	No Violation Identified	0	–
HARVARD U ENVIRONMENTAL HEALTH & SAFETY Cambridge, MA	No Violation Identified	0	–
HOPKINTON LIQUEFIED NATURAL GAS FACILITY Hopkinton, MA	No Violation Identified	0	–
HUDSON LIGHT & POWER DEPARTMENT Hudson, MA	No Violation Identified	0	–
IDEAL TAPE COMPANY Lowell, MA	No Violation Identified	0	–
L'ENERGIA ENERGY CENTER Lowell, MA	No Violation Identified	0	–
LOWELL COGENERATION PLANT Lowell, MA	No Violation Identified	0	–
MAYNARD WASTEWATER TREATMENT FACILITY Maynard, MA	No Violation Identified	0	–
MCC-DEC TECH LLC Framingham, MA	No Violation Identified	0	–
SAFETY KLEEN SYSTEMS INC Marlborough, MA	No Violation Identified	0	–
SOMERVILLE COMBINED SEWER OVERFLOW SYSTEM Somerville, MA	No Violation Identified	0	–

All figures for Middlesex County · Massachusetts · United States

EPA Enforcement and Compliance History Online (ECHO), weekly national export. Counts cover active sites in the Facility Registry Service; inspections, formal actions and penalties cover the last five years, quarters in violation the last three years. The EPA attributes a case that covers several facilities to each of them; area penalty totals here count an amount shared through the same federal case once, facility figures show the amount attributed to that facility. Large facilities are Clean Air Act majors, Clean Water Act majors and large hazardous waste generators or handlers. Source record.

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