UV disinfection: wastewater treatment plants in Massachusetts
17 plants · 26% of the state · 20 MGD combined
Klarifi identifies 17 publicly owned wastewater treatment plants with uv disinfection in Massachusetts, 26% of the 66 plants in the state (20 MGD combined). The largest is Brockton Advanced Water Reclamation Fac in Brockton at 9.9 MGD.
Ultraviolet disinfection destroys pathogens in the final effluent without chemicals or a chlorine residual. It has replaced chlorine at many plants since the 2000s and needs lamp, ballast and sleeve replacement on a fixed cycle, which keeps these plants in the market for UV suppliers.
The largest plants with UV disinfection in Massachusetts
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Brockton Advanced Water Reclamation Fac | Brockton | 9.9 | MAL101010 | Dec 2030 | 10 |
| 2 | Westborough Wastewater Treatment Plant | Westborough | 4.17 | MA0100412 | Apr 2027 | 2 |
| 3 | Westerly Wastewater Treatment Facility | Marlborough | 1.16 | MA0100480 | Dec 2026 | 26 |
| 4 | Uxbridge Wastewater Treatment Facility | Uxbridge | 0.71 | MAG590003 | Oct 2027 | 24 |
| 5 | Concord Wastewater Treatment Facility | Concord | 0.68 | MAG590030 | Oct 2027 | 5 |
| 6 | Salisbury Wastewater Treatment Facility | Salisbury | 0.59 | MA0102873 | Jan 2021 | 16 |
| 7 | Ipswich Wastewater Treatment Plant | Ipswich | 0.5 | MAG590036 | Oct 2027 | 2 |
| 8 | Lee Wastewater Treatment Facility | Lee | 0.47 | MAG590023 | Oct 2027 | 0 |
| 9 | Spencer Wastewater Treatment Plant | Spencer | 0.44 | MAG590010 | Oct 2027 | 20 |
| 10 | Lenox Center Wastewater Treatment Facility | Lenox | 0.3 | MAG590024 | Oct 2027 | 12 |
| 11 | North Brookfield Waste Water Treatment Plant | North Brookfield | 0.29 | MAG580037 | Nov 2026 | 20 |
| 12 | Cohasset Wastewater Treatment Facility | Cohasset | 0.21 | MAG580033 | Nov 2026 | 66 |
| 13 | Shelburne Wastewater Treatment Facility | Shelburne | 0.11 | MAG580002 | Nov 2026 | 24 |
| 14 | Stockbridge W W T P | Stockbridge | 0.1 | MAG580029 | Nov 2026 | 0 |
| 15 | Marion Wastewater Treatment Facility | Marion | 0.09 | MA0100030 | Nov 2022 | 17 |
| 16 | Town Of Wayland W W T P | Wayland | 0.03 | MAG580011 | Nov 2026 | 17 |
| 17 | Woronoco Village W W T F | Woronoco Village | 0.004 | MAG580025 | Nov 2026 | 2 |
Contacts and project signals for every plant on this list
Klarifi adds verified decision-maker contacts, permit limits, discharge monitoring data and the capital projects planned in each city, filterable by technology, size and compliance record.
Other technologies in Massachusetts
UV disinfection in other states
UV disinfection in Massachusetts: 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 September 11, 2026.