Activated sludge and clarifiers: wastewater treatment plants in Kentucky
103 plants · 53% of the state · 171 MGD reported by 100 plants
Klarifi identifies 103 publicly owned wastewater treatment plants with activated sludge and clarifiers in Kentucky, 53% of the 193 plants in the state (171 MGD reported by 100 plants). The largest is Msd, Morris Forman Plant in Louisville at 56.18 MGD.
Activated sludge is the standard mechanical process for cities: aeration basins where bacteria consume organic matter, followed by clarifiers that settle the biomass out. These plants are identified by their circular or rectangular clarifiers and by the suspended-growth process code, and they are the main market for blowers, diffusers, clarifier mechanisms and instrumentation.
The largest activated sludge plants 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 | Derek R Guthrie WQTC MSD | Louisville | 39.73 | KY0078956 | Apr 2031 | 16 |
| 3 | Rwra Max Rhoads WWTP | Owensboro | 6.56 | KY0020095 | Dec 2021 | 1 |
| 4 | Valley Creek Wastewater Treatment Plant | Elizabethtown | 5.3 | KY0022039 | Oct 2023 | 1 |
| 5 | Richmond Otter Creek STP | Richmond | 4.57 | KY0107107 | Dec 2030 | 4 |
| 6 | Strodes Creek STP | Winchester | 3.18 | KY0037991 | Sep 2026 | 2 |
| 7 | London STP | London | 3.02 | KY0021270 | May 2030 | 20 |
| 8 | Henderson South STP #2 | Robards | 2.89 | KY0100293 | Jun 2012 | 0 |
| 9 | Bee Creek WWTP | Murray | 2.83 | KY0072761 | Sep 2028 | 2 |
| 10 | Hopkinsville Hammond Wood STP | Hopkinsville | 2.67 | KY0066532 | Sep 2030 | 2 |
| 11 | Waste Water Treatment | Corbin | 2.5 | KY0020133 | Jan 2031 | 26 |
| 12 | Berea Municipal Utilities WWTP | Berea | 2.23 | KY0079898 | Nov 2030 | 0 |
| 13 | Morehead WWTP | Morehead | 1.87 | KY0052752 | Dec 2030 | 0 |
| 14 | Radcliff STP | Radcliff | 1.86 | KY0022390 | Nov 2029 | 1 |
| 15 | Fort Knox WWTP | Fort Knox | 1.64 | KY0112721 | Sep 2030 | 2 |
| 16 | Greenup County Environmental Commission Wastewater Treatment Plant | Russell | 1.63 | KY0048348 | May 2030 | 0 |
| 17 | Mount Sterling Hinkston Creek STP | Mt Sterling | 1.62 | KY0104400 | Dec 2027 | 14 |
| 18 | Hazard, City Of | Hazard | 1.48 | KY0020079 | Aug 2030 | 8 |
| 19 | Harrodsburg WWTP Expansion | Harrodsburg | 1.39 | KY0027421 | Dec 2027 | 75 |
| 20 | Paris STP | Paris | 1.37 | KY0090654 | Mar 2030 | 6 |
| 21 | Carrollton Regional WWTP | Carrollton | 1.18 | KY0104931 | Mar 2027 | 0 |
| 22 | Leitchfield STP | Leitchfield | 1.04 | KY0022934 | Nov 2030 | 1 |
| 23 | Cynthiana STP (new) | Cynthiana | 0.93 | KY0105856 | Jun 2026 | 1 |
| 24 | Mount Washington STP | Mt Washington | 0.91 | KY0033804 | Nov 2030 | 0 |
| 25 | Greenville STP | Greenville | 0.86 | KY0020010 | Mar 2030 | 29 |
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
Activated sludge and clarifiers in other states
Activated sludge and clarifiers 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.