Lagoon systems: wastewater treatment plants in New York
46 plants · 10% of the state · 74 MGD reported by 41 plants
Klarifi identifies 46 publicly owned wastewater treatment plants with lagoon systems in New York, 10% of the 467 plants in the state (74 MGD reported by 41 plants). The largest is Albany County Sewer District - South Plant in Albany at 43.24 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 | 43.24 | NY0026867 | Feb 2030 | 49 |
| 2 | Big Sister Creek WRRF | Angola | 6.58 | NYR00A952 | Mar 2028 | 7 |
| 3 | Oak Orchard WWTP | Clay | 6.29 | NY0030317 | Apr 2031 | 0 |
| 4 | Batavia (c) STP | Batavia | 5.32 | NY0026514 | Dec 2019 | 73 |
| 5 | Dunkirk Water Filtration Plant | Dunkirk | 2.55 | NY0026409 | Mar 2018 | 10 |
| 6 | Gouverneur (v) WWTF | Gouverneur | 1.28 | NY0020117 | Mar 2028 | 12 |
| 7 | Canton WWTP | Canton | 0.94 | NY0236586 | Jun 2026 | 36 |
| 8 | Greenport (t) Sd 1 STP | Hudson | 0.92 | NY0030988 | Apr 2030 | 26 |
| 9 | Sidney Vill Water Pollution Control Plant | Sidney | 0.59 | NY0029271 | Jun 2029 | 51 |
| 10 | Chateaugay (v) WWTP | Chateaugay | 0.57 | NY0024830 | Jan 2026 | 3 |
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 October 26, 2026.
Wastewater terms: WWTP · POTW · Biosolids · MGD · Lift station · all terms