Lagoon systems: wastewater treatment plants in Mississippi
107 plants · 80% of the state · 57 MGD reported by 37 plants
Klarifi identifies 107 publicly owned wastewater treatment plants with lagoon systems in Mississippi, 80% of the 134 plants in the state (57 MGD reported by 37 plants). The largest is West Rankin Utility Authority WWTF in Richland at 12.02 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 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 | Canton Mun Util-Beatties Bluff WWTF | Canton | 4.91 | MS0057517 | Dec 2030 | 372 |
| 5 | Reynolds R. Ridgely Wastewater Plant | Columbus | 3.85 | MS0056472 | Dec 2030 | 2 |
| 6 | Laurel Potw, Number 1 | Laurel | 3.18 | MS0024163 | Apr 2031 | 0 |
| 7 | City Of Greenwood - Wastewater Treatment Plant | Greenwood | 2.49 | MS0023833 | Dec 2029 | 0 |
| 8 | West Point Potw, West | West Point | 2.3 | MS0020788 | May 2027 | 11 |
| 9 | Natchez POTW | Natchez | 2.14 | MS0024252 | Mar 2028 | 0 |
| 10 | Cleveland POTW | Cleveland | 1.56 | MS0020567 | Jan 2030 | 25 |
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
Lagoon systems in other states
Lagoon systems 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: WWTP · POTW · Biosolids · Lift station · Inflow and infiltration · all terms