Massachusetts NPDES permit search
Status, expiry and violations for 66 municipal wastewater permits · issued by EPA Region 1
In short
How do I look up an NPDES permit in Massachusetts?
Search this page by permit number or plant name for a municipal plant’s permit status, expiry date and violations. For the official file, search EPA’s list of Massachusetts permits or MassDEP’s list of state permits. EPA’s ECHO database shows the monitoring results and violations of every permit. The 257 industrial permits in Massachusetts are listed in Klarifi with a free account.
Links to official sources checked September 2026.
Effective
60
Administratively continued
5
Expired
1
Plants with effluent violations, 3 years
54
Where to find official Massachusetts NPDES records
Massachusetts has not taken over the NPDES program: EPA Region 1 issues and enforces the permits and keeps the official file, with the state agency handling water-quality certification. MassDEP issues a matching state surface water discharge permit under the same MA number. EPA Region 1 website ↗
permit documents
EPA Region 1’s table of final permits. Type the facility name, town or permit number (for example MA0100218) in the search box and click the facility to open the permit.
permit documents
MassDEP’s alphabetical table of the matching state permits; each row links the state permit and, for most facilities, its water quality certification.
permits
MassDEP’s permit records: open Search Data > Permits and search by facility name or permit number; the program “Water Pollution Control” covers discharge permits.
permits · DMRs · inspections · violations · enforcement
EPA’s Enforcement and Compliance History Online. Search water facilities by permit number, name or city; the Detailed Facility Report lists inspections, violations and enforcement actions, and Effluent Charts plot monitoring results against the permit limits.
- Permit numbers
- EPA and MassDEP use the same number, MA plus seven characters (MA0100218).
- Discharge monitoring reports
- Through EPA’s NetDMR.
- Violations and enforcement
- MassDEP’s enforcement actions in the EEA Data Portal ↗
Industrial and commercial NPDES permits in Massachusetts
Most NPDES permits are not held by municipal plants. EPA’s permit database lists 257 individual permits in force for industrial and commercial facilities in Massachusetts (manufacturers, food processors, mines, power plants, landfills), 63 of them major dischargers, plus 1,084 facilities covered by a general permit, mostly for stormwater. 56 of the individual permits recorded at least one effluent violation in the last three years.
| Facility | Permit | Status | Expires | Effluent violations |
|---|
Unlock 257 industrial permits in Massachusetts
Search every industrial and commercial discharger in Massachusetts by name or permit number, with permit status, expiry and violation history. Free with a Klarifi account.
Industrial and commercial NPDES permits in Massachusetts: permits in force (effective or administratively continued) held by facilities EPA does not class as publicly owned treatment works or federal facilities. Source: EPA ICIS-NPDES via Klarifi, October 2026.
Violations at Massachusetts wastewater plants
54 of the 66 municipal plants on this page recorded at least one effluent violation, a monitored value above a permit limit, in the last three years, and 55 had a violation of any kind, including late or missing monitoring reports. Each plant’s page shows its own count. EPA’s enforcement records list 98 formal cases naming Massachusetts wastewater plants, 13 of them since fiscal year 2020, with $1.4 million in penalties assessed. Enforcement cases in Massachusetts →
Permit renewals by year
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
Largest permit holders in Massachusetts
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Deer Island Wastewater Treatment Facility | Winthrop | 270.96 | 480 | MA0103284 | Administratively continued | Jul 2005 | 3 |
| Upper Blackstone Wastewater Treatment Plant | Millbury | 30.02 | — | MAR053209 | Expired | Feb 2026 | 17 |
| New Bedford Wastewater Treatment Facility | New Bedford | 21.74 | 30 | MA0100781 | Administratively continued | Nov 2013 | 14 |
| Greater Lawrence Wastewater Treatment Facility | North Andover | 22.49 | — | MAL100447 | Effective | Dec 2030 | 10 |
| South Essex Wastewater Treatment Plant | Salem | 21.66 | — | MAL100501 | Effective | Dec 2030 | 33 |
| Pittsfield Wastewater Treatment Facility | Pittsfield | 9.85 | 17 | MA0101681 | Effective | Oct 2026 | 84 |
| Brockton Advanced Water Reclamation Fac | Brockton | 14.52 | — | MAL101010 | Effective | Dec 2030 | 10 |
| Northampton Wastewater Treatment Plant | Northampton | 4.21 | 8.65 | MA0101818 | Effective | Nov 2028 | 40 |
| Haverhill Wastewater Treatment Facility | Haverhill | 8.52 | — | MAL101621 | Effective | Dec 2030 | 4 |
| Taunton Wastewater Treatment Facility | Taunton | 7.32 | 8.4 | MA0100897 | Administratively continued | Jul 2020 | 48 |
Massachusetts NPDES permits: questions
NPDES permit search in other states
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed October 12, 2026.
Wastewater terms: NPDES permit · POTW · Significant industrial user · MGD · Equalization tank · Centrate · all terms