Oxidation ditches: wastewater treatment plants in Kentucky
64 plants · 33% of the state · 59 MGD reported by 63 plants
Klarifi identifies 64 publicly owned wastewater treatment plants with oxidation ditches in Kentucky, 33% of the 193 plants in the state (59 MGD reported by 63 plants). The largest is Rwra Max Rhoads WWTP in Owensboro at 6.56 MGD.
Oxidation ditches are ring-shaped activated sludge reactors with long retention times, common at plants between 0.5 and 10 MGD. They are recognisable from the air by their looped channels and rely on surface aerators or brush rotors, which are frequent replacement and energy-efficiency projects.
The largest oxidation ditch plants in Kentucky
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Rwra Max Rhoads WWTP | Owensboro | 6.56 | KY0020095 | Dec 2021 | 1 |
| 2 | Valley Creek Wastewater Treatment Plant | Elizabethtown | 5.3 | KY0022039 | Oct 2023 | 1 |
| 3 | Richmond Otter Creek STP | Richmond | 4.57 | KY0107107 | Dec 2030 | 4 |
| 4 | Strodes Creek STP | Winchester | 3.18 | KY0037991 | Sep 2026 | 2 |
| 5 | London STP | London | 3.02 | KY0021270 | May 2030 | 20 |
| 6 | Bee Creek WWTP | Murray | 2.83 | KY0072761 | Sep 2028 | 2 |
| 7 | Hopkinsville Hammond Wood STP | Hopkinsville | 2.67 | KY0066532 | Sep 2030 | 2 |
| 8 | Waste Water Treatment | Corbin | 2.5 | KY0020133 | Jan 2031 | 26 |
| 9 | Berea Municipal Utilities WWTP | Berea | 2.23 | KY0079898 | Nov 2030 | 0 |
| 10 | Radcliff STP | Radcliff | 1.86 | KY0022390 | Nov 2029 | 1 |
| 11 | Fort Knox WWTP | Fort Knox | 1.64 | KY0112721 | Sep 2030 | 2 |
| 12 | Greenup County Environmental Commission Wastewater Treatment Plant | Russell | 1.63 | KY0048348 | May 2030 | 0 |
| 13 | Mount Sterling Hinkston Creek STP | Mt Sterling | 1.62 | KY0104400 | Dec 2027 | 14 |
| 14 | Hazard, City Of | Hazard | 1.48 | KY0020079 | Aug 2030 | 8 |
| 15 | Harrodsburg WWTP Expansion | Harrodsburg | 1.39 | KY0027421 | Dec 2027 | 75 |
| 16 | Paris STP | Paris | 1.37 | KY0090654 | Mar 2030 | 6 |
| 17 | Cynthiana STP (new) | Cynthiana | 0.93 | KY0105856 | Jun 2026 | 1 |
| 18 | Mount Washington STP | Mt Washington | 0.91 | KY0033804 | Nov 2030 | 0 |
| 19 | La Grange STP | La Grange | 0.85 | KY0020001 | Nov 2027 | 5 |
| 20 | Winchester Municipal Utilities | Winchester | 0.74 | KY0108740 | Jan 2031 | 1 |
| 21 | Paintsville Municipal Water Works-Paintsville WTP | Paintsville | 0.72 | KY0020630 | Nov 2030 | 2 |
| 22 | Caveland Environmental Auth | Horse Cave | 0.72 | KY0091561 | Mar 2027 | 6 |
| 23 | Oak Grove, City Of | Oak Grove | 0.59 | KY0094056 | Dec 2026 | 6 |
| 24 | Irvine STP | Irvine | 0.58 | KY0025909 | Feb 2031 | 48 |
| 25 | Liberty STP | Liberty | 0.53 | KY0026352 | Sep 2030 | 33 |
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
Oxidation ditches in other states
Oxidation ditches 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.