Lagoon systems: wastewater treatment plants in Kentucky
63 plants · 32% of the state · 30 MGD reported by 59 plants
Klarifi identifies 63 publicly owned wastewater treatment plants with lagoon systems in Kentucky, 32% of the 195 plants in the state (30 MGD reported by 59 plants). The largest is Strodes Creek STP in Winchester at 4.5 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 Kentucky
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Strodes Creek STP | Winchester | 4.5 | KY0037991 | Sep 2026 | 1 |
| 2 | Henderson South STP #2 | Robards | 2.69 | KY0100293 | Jun 2012 | 0 |
| 3 | Radcliff STP | Radcliff | 2.42 | KY0022390 | Nov 2029 | 1 |
| 4 | Greenup County Environmental Commission Wastewater Treatment Plant | Russell | 1.91 | KY0048348 | May 2030 | 0 |
| 5 | Harrodsburg WWTP Expansion | Harrodsburg | 1.84 | KY0027421 | Dec 2027 | 69 |
| 6 | Leitchfield STP | Leitchfield | 1.42 | KY0022934 | Nov 2030 | 1 |
| 7 | Greenville STP | Greenville | 1.19 | KY0020010 | Mar 2030 | 29 |
| 8 | Morganfield WWTP | Morganfield | 1.16 | KY0021440 | May 2031 | 26 |
| 9 | Carrollton Regional WWTP | Carrollton | 1.15 | KY0104931 | Mar 2027 | 0 |
| 10 | La Grange STP | La Grange | 1.02 | KY0020001 | Nov 2027 | 5 |
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 Kentucky
Lagoon systems in other states
Lagoon systems in Kentucky: 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 · Inflow and infiltration · Sludge dewatering · all terms