Lagoon systems: wastewater treatment plants in New York
61 plants · 13% of the state · 96 MGD reported by 53 plants
Klarifi identifies 61 publicly owned wastewater treatment plants with lagoon systems in New York, 13% of the 461 plants in the state (96 MGD reported by 53 plants). The largest is Albany County Sewer District - South Plant in Albany at 45.11 MGD.
Lagoon systems treat wastewater in large earthen ponds over weeks of retention time, with or without mechanical aeration. They serve thousands of small towns because they are cheap to run, but they struggle with ammonia and nutrient limits, fill with sludge over decades and are the plants most often converted or upgraded when a permit is renewed.
The largest lagoons in New York
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Albany County Sewer District - South Plant | Albany | 45.11 | NY0026867 | Feb 2030 | 49 |
| 2 | Bergen Point STP & Bergen Ave Dock | W Babylon | 26.7 | NY0104809 | Dec 2019 | 81 |
| 3 | Ocsd#1 - Harriman Sewage Treatment Plant | Harriman | 4.53 | NYR00A935 | Mar 2028 | 50 |
| 4 | Oak Orchard WWTP | Clay | 4.21 | NY0030317 | Apr 2031 | 0 |
| 5 | Batavia (c) STP | Batavia | 2.97 | NY0026514 | Dec 2019 | 71 |
| 6 | Big Sister Creek WRRF | Angola | 2.74 | NYR00A952 | Mar 2028 | 7 |
| 7 | City Of Ogdensburg Wastewater Treatment Plant | Ogdensburg | 1.6 | NY0029831 | Feb 2023 | 25 |
| 8 | Dunkirk Water Filtration Plant | Dunkirk | 1.2 | NY0026409 | Mar 2018 | 10 |
| 9 | Riverhead Sewer District WWTF | Riverhead | 0.97 | NY0020061 | Sep 2016 | 7 |
| 10 | Gouverneur (v) WWTF | Gouverneur | 0.52 | NY0020117 | Mar 2028 | 12 |
| 11 | Greenport (t) Sd 1 STP | Hudson | 0.48 | NY0030988 | Apr 2030 | 25 |
| 12 | Chateaugay (v) WWTP | Chateaugay | 0.45 | NY0024830 | Jan 2026 | 3 |
| 13 | Sidney Vill Water Pollution Control Plant | Sidney | 0.39 | NY0029271 | Jun 2029 | 51 |
| 14 | Perry (v) WWTP | Perry | 0.38 | NY0022985 | Dec 2025 | 15 |
| 15 | Canton WWTP | Canton | 0.38 | NY0236586 | Jun 2026 | 37 |
| 16 | Dannemora (v) STP | Dannemora | 0.31 | NY0022195 | Nov 2030 | 46 |
| 17 | Avon WWTP | Woodridge | 0.28 | NY0023493 | Mar 2030 | 84 |
| 18 | Canajoharie (v) WWTP | Canajoharie | 0.24 | NY0023485 | Jun 2023 | 0 |
| 19 | Kiamesha Lake Sd STP | Monticello | 0.23 | NY0030724 | Feb 2028 | 29 |
| 20 | Victor (v) STP | Victor | 0.22 | NY0022713 | Jun 2019 | 32 |
| 21 | Pawling Joint Sewer Comm WWTP | Pawling | 0.2 | NY0165891 | May 2031 | 65 |
| 22 | Owego (t) Sd#1 | Owego | 0.18 | NY0022730 | Apr 2028 | 0 |
| 23 | Warrensburg (t) STP | Warrensburg | 0.16 | NY0248720 | Feb 2030 | 7 |
| 24 | Windham Wastewater Treatment Plant | Windham | 0.16 | NY0262935 | Nov 2029 | 18 |
| 25 | Weedsport (v) WWTP | Weedsport | 0.15 | NY0020559 | Mar 2029 | 0 |
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 New York
Lagoon systems in other states
Lagoon systems in New York: 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.