Activated sludge and clarifiers: wastewater treatment plants in Mississippi
36 plants · 28% of the state · 62 MGD reported by 34 plants
Klarifi identifies 36 publicly owned wastewater treatment plants with activated sludge and clarifiers in Mississippi, 28% of the 127 plants in the state (62 MGD reported by 34 plants). The largest is West Rankin Utility Authority WWTF in Richland at 10.32 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 Mississippi
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | West Rankin Utility Authority WWTF | Richland | 10.32 | MS0061743 | Feb 2030 | 4 |
| 2 | Dcrua, Short Fork WWTF | Hernando | 6.5 | MS0062227 | Jun 2030 | 114 |
| 3 | Meridian POTW | Meridian | 5.41 | MS0020117 | Oct 2030 | 40 |
| 4 | Canton Mun Util-Beatties Bluff WWTF | Canton | 4.54 | MS0057517 | Dec 2030 | 375 |
| 5 | Jcua - West Jackson County WWTP | Pascagoula | 4.4 | MS0045446 | Dec 2029 | 16 |
| 6 | West Biloxi Wastewater Treatment Plant | Biloxi | 4.07 | MS0030333 | Jun 2028 | 1 |
| 7 | Harrison County Wastewater And Solid Waste Management Authority, East Biloxi Pot | Biloxi | 2.85 | MS0023159 | Mar 2029 | 0 |
| 8 | Laurel Potw, Number 1 | Laurel | 2.8 | MS0024163 | Apr 2031 | 0 |
| 9 | Hcua, Long Beach And Pass Christian | Pass Christian | 2.4 | MS0043141 | May 2030 | 0 |
| 10 | Natchez POTW | Natchez | 2.31 | MS0024252 | Mar 2028 | 0 |
| 11 | Corinth POTW | Corinth | 2.02 | MS0061328 | Apr 2029 | 149 |
| 12 | Brookhaven POTW | Brookhaven | 1.73 | MS0024147 | Feb 2031 | 1 |
| 13 | Jackson POTW - Trahon And Big Creek WWTF | Jackson | 1.7 | MS0044059 | Jul 2026 | 24 |
| 14 | Clarksdale POTW | Clarksdale | 1.31 | MS0020311 | Apr 2028 | 154 |
| 15 | Bay Springs Industrial Park | Bay Springs | 0.98 | MS0034860 | Mar 2029 | 0 |
| 16 | Reynolds R. Ridgely Wastewater Plant | Columbus | 0.96 | MS0056472 | Dec 2030 | 2 |
| 17 | Diamondhead Water Sewer District | Diamondhead | 0.75 | MS0046078 | Feb 2028 | 0 |
| 18 | Saltillo POTW | Saltillo | 0.72 | MS0021733 | Mar 2025 | 21 |
| 19 | Desoto County Regional Utility Authority, Johnson Creek Wastewater Treatment Fac | Walls | 0.71 | MS0061271 | Jun 2030 | 3 |
| 20 | Tunica County Utility District | Robinsonville | 0.69 | MS0048691 | Nov 2029 | 30 |
| 21 | Batesville POTW | Batesville | 0.68 | MS0024627 | Sep 2028 | 9 |
| 22 | Pearl River County Utility Authority, Neal Road POTW | Picayune | 0.65 | MS0061174 | Nov 2028 | 0 |
| 23 | Jackson County Utility Authority, POTW 6c | Moss Point | 0.6 | MS0021521 | Aug 2030 | 8 |
| 24 | Florence POTW | Florence | 0.59 | MS0025275 | Dec 2028 | 35 |
| 25 | Waynesboro POTW | Waynesboro | 0.53 | MS0024228 | Jan 2028 | 30 |
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 Mississippi
Activated sludge and clarifiers in other states
Activated sludge and clarifiers in Mississippi: 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.