Massachusetts wastewater permits expiring in 2027
18 NPDES permits · 26 MGD combined average flow
18 publicly owned wastewater treatment plants in Massachusetts hold NPDES permits that expire during 2027, issued by US EPA Region 1 (with MassDEP). The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.
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.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|
| Marlborough DPW Water Division East Plt | Marlborough | 2.77 | MA0100498 | Mar 2027 | 16 |
| Westborough Wastewater Treatment Plant | Westborough | 4.86 | MA0100412 | Apr 2027 | 2 |
| Gardner W W T F | East Templeton | 2.94 | MAG590013 | Oct 2027 | 78 |
| Rockland Wastewater Plant | Rockland | 2.21 | MAG590038 | Oct 2027 | 37 |
| Greenfield Water Pollution Control Facility | Greenfield | 2.2 | MAG590014 | Oct 2027 | 32 |
| Newburyport Wastewater Treatment Facility | Newburyport | 1.52 | MAG590035 | Oct 2027 | 0 |
| Hudson W W T F | Hudson | 1.33 | MAG590029 | Oct 2027 | 78 |
| Middleborough WPCF | Middleborough | 1.21 | MAG590042 | Oct 2027 | 12 |
| Plymouth Wastewater Treatment Facility | Plymouth | 1.08 | MAG590040 | Oct 2027 | 5 |
| Orange Wastewater Treatment Plant | Orange | 0.9 | MAG590019 | Oct 2027 | 511 |
| Uxbridge Wastewater Treatment Facility | Uxbridge | 0.9 | MAG590003 | Oct 2027 | 24 |
| Concord Wastewater Treatment Facility | Concord | 0.83 | MAG590030 | Oct 2027 | 5 |
| Medfield Wastewater Treatment Facility | Medfield | 0.77 | MAG590008 | Oct 2027 | 664 |
| Spencer Wastewater Treatment Plant | Spencer | 0.66 | MAG590010 | Oct 2027 | 20 |
| Ipswich Wastewater Treatment Plant | Ipswich | 0.66 | MAG590036 | Oct 2027 | 2 |
| Lee Wastewater Treatment Facility | Lee | 0.58 | MAG590023 | Oct 2027 | 1 |
| Lenox Center Wastewater Treatment Facility | Lenox | 0.5 | MAG590024 | Oct 2027 | 12 |
| Erving Wastewater Treatment Plant #1 | Erving | 0.07 | MAG590020 | Oct 2027 | 0 |
Massachusetts permit renewals in 2027: questions
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 26, 2026.
Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Activated sludge · Oxidation ditch · all terms
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Klarifi. “NPDES permits expiring in 2027: Massachusetts plants.” Updated October 26, 2026. https://klarifi.io/facilities/massachusetts/permits-expiring/2027Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.