Lagoon systems: wastewater treatment plants in Kentucky
74 plants · 38% of the state · 90 MGD reported by 64 plants
Klarifi identifies 74 publicly owned wastewater treatment plants with lagoon systems in Kentucky, 38% of the 193 plants in the state (90 MGD reported by 64 plants). The largest is Msd, Morris Forman Plant in Louisville at 56.18 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 | Msd, Morris Forman Plant | Louisville | 56.18 | KY0022411 | Sep 2004 | 221 |
| 2 | Strodes Creek STP | Winchester | 3.18 | KY0037991 | Sep 2026 | 2 |
| 3 | London STP | London | 3.02 | KY0021270 | May 2030 | 20 |
| 4 | Henderson South STP #2 | Robards | 2.89 | KY0100293 | Jun 2012 | 0 |
| 5 | Hopkinsville Hammond Wood STP | Hopkinsville | 2.67 | KY0066532 | Sep 2030 | 2 |
| 6 | Waste Water Treatment | Corbin | 2.5 | KY0020133 | Jan 2031 | 26 |
| 7 | Radcliff STP | Radcliff | 1.86 | KY0022390 | Nov 2029 | 1 |
| 8 | Greenup County Environmental Commission Wastewater Treatment Plant | Russell | 1.63 | KY0048348 | May 2030 | 0 |
| 9 | Hazard, City Of | Hazard | 1.48 | KY0020079 | Aug 2030 | 8 |
| 10 | Harrodsburg WWTP Expansion | Harrodsburg | 1.39 | KY0027421 | Dec 2027 | 75 |
| 11 | Carrollton Regional WWTP | Carrollton | 1.18 | KY0104931 | Mar 2027 | 0 |
| 12 | Leitchfield STP | Leitchfield | 1.04 | KY0022934 | Nov 2030 | 1 |
| 13 | Greenville STP | Greenville | 0.86 | KY0020010 | Mar 2030 | 29 |
| 14 | La Grange STP | La Grange | 0.85 | KY0020001 | Nov 2027 | 5 |
| 15 | Prestonsburg STP | Prestonsburg | 0.63 | KY0027413 | Aug 2031 | 2 |
| 16 | Morganfield WWTP | Morganfield | 0.54 | KY0021440 | May 2031 | 27 |
| 17 | Benton STP | Benton | 0.53 | KY0021172 | Sep 2029 | 7 |
| 18 | Eddyville STP | Eddyville | 0.49 | KY0027979 | Oct 2030 | 113 |
| 19 | Vine Grove STP | Vine Grove | 0.47 | KY0024988 | Aug 2031 | 21 |
| 20 | Pineville STP | Pineville | 0.44 | KY0024058 | Feb 2027 | 73 |
| 21 | Eminence STP | Eminence | 0.36 | KY0026883 | Sep 2030 | 5 |
| 22 | Clay STP | Clay | 0.35 | KY0028096 | Nov 2029 | 77 |
| 23 | New Marion WWTP | Marion | 0.32 | KY0113247 | Jun 2027 | 358 |
| 24 | Hardinsburg STP | Hardinsburg | 0.32 | KY0028363 | Sep 2030 | 4 |
| 25 | Hickman East STP | Hickman | 0.29 | KY0028436 | Aug 2025 | 218 |
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 September 11, 2026.