Nutrient removal: wastewater treatment plants in Missouri
24 plants · 4% of the state · 43 MGD reported by 23 plants
Klarifi identifies 24 publicly owned wastewater treatment plants with nutrient removal in Missouri, 4% of the 671 plants in the state (43 MGD reported by 23 plants). The largest is Southwest WWTP in Springfield at 30.9 MGD.
Nutrient removal takes nitrogen and phosphorus out of the effluent, biologically in anoxic and anaerobic zones or chemically with metal salts. It is driven by permit limits and TMDLs on the receiving water and is the largest upgrade a plant can face, which makes these plants the best-documented market for process equipment and chemicals.
The largest plants with nutrient removal in Missouri
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Southwest WWTP | Springfield | 30.9 | MO0049522 | Jul 2025 | 0 |
| 2 | Poplar Bluff Municipal WWTP | Poplar Bluff | 4.75 | MO0043648 | Sep 2024 | 4 |
| 3 | Hollister WWTF | Hollister | 1.85 | MO0116041 | Dec 2024 | 2 |
| 4 | Nixa WWTF | Nixa | 1.66 | MO0028037 | Jun 2028 | 16 |
| 5 | Ozark WWTF | Ozark | 0.99 | MO0099163 | Sep 2028 | 36 |
| 6 | Rogersville WWTP | Rogersville | 0.37 | MO0102679 | Jun 2028 | 96 |
| 7 | Cassville WWTP | Cassville | 0.37 | MO0042579 | Mar 2026 | 3 |
| 8 | Anderson WWTF | Anderson | 0.33 | MO0025801 | Jun 2025 | 5 |
| 9 | Seymour Pws | Seymour | 0.23 | MO0022985 | Dec 2025 | 32 |
| 10 | Kimberling City WWTP | Kimberling City | 0.18 | MO0046931 | Jun 2029 | 23 |
Plants planning nutrient removal upgrades
These plants report nutrient removal as a planned process in the EPA Clean Watersheds Needs Survey: the earliest public signal of a project.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires |
|---|---|---|---|---|
| Salem Municipal WWTF | Salem | 0.85 | MO0021768 | Mar 2029 |
| Clark Pws-Chlorine Booster Station | Clark | 0.63 | MO0054585 | Apr 2030 |
| Higginsville South WWTF | Higginsville | 0.42 | MO0023108 | Sep 2027 |
| Ellington WWTF | Ellington | 0.17 | MO0022896 | Dec 2024 |
| Braymer WWTF | Braymer | 0.15 | MO0028061 | Jul 2027 |
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 Missouri
Nutrient removal in other states
Nutrient removal in Missouri: 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: Biological nutrient removal · Tertiary treatment · Activated sludge · Biosolids · Filter press · all terms