UV disinfection: wastewater treatment plants in Missouri
297 plants · 50% of the state · 287 MGD reported by 289 plants
Klarifi identifies 297 publicly owned wastewater treatment plants with uv disinfection in Missouri, 50% of the 593 plants in the state (287 MGD reported by 289 plants). The largest is Metropolitan St. Louis Sewer District Lemay WWTP in St. Louis at 79.3 MGD.
Ultraviolet disinfection destroys pathogens in the final effluent without chemicals or a chlorine residual. It has replaced chlorine at many plants since the 2000s and needs lamp, ballast and sleeve replacement on a fixed cycle, which keeps these plants in the market for UV suppliers.
The largest plants with UV disinfection in Missouri
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Metropolitan St. Louis Sewer District Lemay WWTP | St. Louis | 79.3 | MO0025151 | Aug 2031 | 0 |
| 2 | Little Blue Valley Sewer District | Independence | 29.2 | MOL101087 | Dec 2030 | 14 |
| 3 | St. Joseph Water Protection Facility | Saint Joseph | 18.27 | MO0023043 | Nov 2025 | 4 |
| 4 | O' Fallon Wastewater Treatment Plant | O'Fallon | 6.7 | MO0028720 | Mar 2025 | 0 |
| 5 | Joplin Turkey Creek WWTP | Joplin | 5.7 | MO0103349 | Sep 2022 | 64 |
| 6 | Shoal Creek Wastewater Treatment Facility | Joplin | 5.6 | MO0023256 | Mar 2023 | 9 |
| 7 | Jefferson City Rwrf | Jefferson City | 5.36 | MO0094846 | Mar 2025 | 0 |
| 8 | St Peters Pws | Saint Peters | 4.83 | MO0030970 | Dec 2024 | 0 |
| 9 | Cape Girardeau WWTP | Cape Girardeau | 4.36 | MO0136328 | Jun 2024 | 0 |
| 10 | Dcsd Wastewater Treatment Plant 2 | Weldon Spring | 4.28 | MO0116572 | Dec 2025 | 0 |
| 11 | Springfield NW WWTP | Springfield | 4.06 | MO0103039 | Jul 2025 | 0 |
| 12 | Duckett Creek Sanitation District Treatment Plant #1 | Saint Charles | 4.04 | MO0085472 | Jun 2021 | 0 |
| 13 | St Charles Missouri River WWTP | St. Charles | 3.73 | MO0058351 | Sep 2025 | 0 |
| 14 | MSD Fenton Waste Water Treatment Plant | Fenton | 3.6 | MO0086126 | Dec 2022 | 0 |
| 15 | Blue Springs, Sni A Bar WWTF | Grain Valley | 3.5 | MO0028886 | Nov 2028 | 16 |
| 16 | Poplar Bluff Municipal WWTP | Poplar Bluff | 3.18 | MO0043648 | Sep 2024 | 4 |
| 17 | Carthage WWTP | Carthage | 2.92 | MO0039136 | Mar 2023 | 4 |
| 18 | Monett Wastewater Treatment Plant | Monett | 2.5 | MO0021440 | Jun 2029 | 17 |
| 19 | Sikeston WWTP | Sikeston | 2.23 | MO0035009 | Sep 2025 | 0 |
| 20 | Lebanon WWTP | Lebanon | 2.22 | MO0089010 | Dec 2021 | 1 |
| 21 | Marshall SE WWTP | Marshall | 2.22 | MO0032883 | Mar 2022 | 0 |
| 22 | Rolla Pws-Well 4 - E 10th St | Rolla | 2.17 | MO0050652 | Jun 2023 | 0 |
| 23 | Hollister WWTF | Hollister | 2 | MO0116041 | Dec 2024 | 2 |
| 24 | Neosho WWTP | Neosho | 2 | MO0104906 | Apr 2022 | 27 |
| 25 | Festus-Crystal City WWTP | Crystal City | 1.81 | MO0080632 | Sep 2021 | 14 |
Plants planning uv disinfection upgrades
These plants report uv 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 |
|---|---|---|---|---|
| Kirksville WWTP | Kirksville | 2.02 | MO0049506 | Dec 2027 |
| Harrisonville Pws | Harrisonville | 0.84 | MO0028070 | May 2027 |
| Windsor Southwest WWTF | Windsor | 0.65 | MO0047325 | Mar 2026 |
| Shawnee Bend | Sunrise Beach | 0.6 | MO0123722 | Dec 2027 |
| Winfield WWTF | Winfield | 0.58 | MO0088676 | Jun 2024 |
| Lake Hannibal Estate WWTF | Hannibal | 0.56 | MO0094200 | Dec 2027 |
| Cleveland | Cleveland | 0.49 | MO0111287 | Mar 2026 |
| Eldon WWTP | Eldon | 0.38 | MO0100676 | Dec 2024 |
| Higginsville South WWTF | Higginsville | 0.29 | MO0023108 | Sep 2027 |
| Marble Hill WWTF | Marble Hill | 0.2 | MO0109762 | Sep 2030 |
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
UV disinfection in other states
UV 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 September 11, 2026.