Activated sludge and clarifiers: wastewater treatment plants in Mississippi
32 plants · 24% of the state · 70 MGD reported by 31 plants
Klarifi identifies 32 publicly owned wastewater treatment plants with activated sludge and clarifiers in Mississippi, 24% of the 134 plants in the state (70 MGD reported by 31 plants). The largest is West Rankin Utility Authority WWTF in Richland at 12.02 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 | 12.02 | MS0061743 | Feb 2030 | 4 |
| 2 | Meridian POTW | Meridian | 7.57 | MS0020117 | Oct 2030 | 39 |
| 3 | Dcrua, Short Fork WWTF | Hernando | 6.26 | MS0062227 | Jun 2030 | 114 |
| 4 | West Biloxi Wastewater Treatment Plant | Biloxi | 5.57 | MS0030333 | Jun 2028 | 1 |
| 5 | Jcua - West Jackson County WWTP | Pascagoula | 5.09 | MS0045446 | Dec 2029 | 16 |
| 6 | Canton Mun Util-Beatties Bluff WWTF | Canton | 4.91 | MS0057517 | Dec 2030 | 372 |
| 7 | Reynolds R. Ridgely Wastewater Plant | Columbus | 3.85 | MS0056472 | Dec 2030 | 2 |
| 8 | Laurel Potw, Number 1 | Laurel | 3.18 | MS0024163 | Apr 2031 | 0 |
| 9 | Harrison County Wastewater And Solid Waste Management Authority, East Biloxi Pot | Biloxi | 2.95 | MS0023159 | Mar 2029 | 0 |
| 10 | Natchez POTW | Natchez | 2.14 | MS0024252 | Mar 2028 | 0 |
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 October 26, 2026.
Wastewater terms: Activated sludge · Biological nutrient removal · Equalization tank · Sludge dewatering · Tertiary treatment · all terms