Chlorine disinfection: wastewater treatment plants in Missouri
98 plants · 15% of the state · 204 MGD reported by 94 plants
Klarifi identifies 98 publicly owned wastewater treatment plants with chlorine disinfection in Missouri, 15% of the 671 plants in the state (204 MGD reported by 94 plants). The largest is Metropolitan St. Louis Sewer District Bissell Point WWTP in St. Louis at 123.06 MGD.
Chlorine or chloramine disinfection, often followed by dechlorination before discharge, remains the most common effluent disinfection in the United States. Plants on gas chlorine are candidates for conversion to hypochlorite or UV, a recurring capital project driven by safety rules and permit limits on residual chlorine.
The largest plants with chlorine disinfection in Missouri
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Metropolitan St. Louis Sewer District Bissell Point WWTP | St. Louis | 123.06 | MO0025178 | Aug 2031 | 14 |
| 2 | MSD Coldwater WWTP | Florissant | 22.75 | MO0025160 | Aug 2031 | 1 |
| 3 | Kc, Westside WWTP | Kansas City | 14.89 | MO0024929 | Jun 2026 | 2 |
| 4 | Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant | Valley Park | 12.6 | MO0101362 | Aug 2031 | 0 |
| 5 | MSD Lower Meramec WWTP | St. Louis | 9.68 | MO0127949 | Aug 2031 | 0 |
| 6 | Rock Creek Waste Treatment | Independence | 6.35 | MO0089681 | Mar 2024 | 12 |
| 7 | Hannibal Pws | Hannibal | 3.71 | MO0093513 | Apr 2023 | 2 |
| 8 | Branson Compton Drive WWTP | Branson | 2.33 | MO0025241 | Sep 2024 | 1 |
| 9 | Neosho WWTP | Neosho | 1.89 | MO0104906 | Apr 2022 | 30 |
| 10 | Sunny Slope Country Club Drive WWTP | Camdenton | 1.28 | MO0130591 | Jun 2024 | 0 |
Plants planning chlorine disinfection upgrades
These plants report chlorine disinfection 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 |
|---|---|---|---|---|
| Republic WWTP | Republic | 1.65 | MO0022098 | Jul 2029 |
| Eagleville Wastewater Treatment Facility | Eagleville | 0.38 | MO0113930 | Apr 2030 |
| Blythedale WWTF | Blythedale | 0.08 | MO0123081 | Jan 2031 |
| Selma Village WWTF | Crystal City | 0.06 | MO0088854 | Jun 2022 |
| Laredo WWTF | Laredo | 0.05 | MO0094692 | Jun 2023 |
| Craig WWTF | Craig | 0.03 | MO0107042 | Mar 2025 |
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
Chlorine disinfection in other states
Chlorine disinfection 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: Tertiary treatment · Ozonation · WWTP · Activated sludge · Oxidation ditch · all terms