What is the largest chlorine disinfection plant in Missouri?

Metropolitan St. Louis Sewer District Bissell Point WWTP in St. Louis, treating about 90.1 MGD under NPDES permit MO0025178.

Which Missouri plants are planning chlorine disinfection upgrades?

4 plants report chlorine disinfection as a planned process in the EPA needs survey, including Republic WWTP in Republic. Planned processes are the earliest public signal of an upgrade.

How are plants with chlorine disinfection identified?

From two sources: treatment structures counted in Klarifi’s review of aerial imagery (lagoons, clarifiers, oxidation ditches, digester silos and gas holders) and the unit processes each plant reports to the EPA Clean Watersheds Needs Survey. A plant is listed when either source records the technology.

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Chlorine disinfection: wastewater treatment plants in Missouri

Name: Chlorine disinfection wastewater treatment plants in Missouri
Creator: Klarifi
License: https://klarifi.io/terms-of-service

96 plants · 16% of the state · 153 MGD reported by 91 plants

Klarifi identifies 96 publicly owned wastewater treatment plants with chlorine disinfection in Missouri, 16% of the 593 plants in the state (153 MGD reported by 91 plants). The largest is Metropolitan St. Louis Sewer District Bissell Point WWTP in St. Louis at 90.1 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.

Chlorine disinfection plants nationwide →All plants in Missouri →Largest plants in Missouri →

The largest plants with chlorine disinfection in Missouri

The 25 largest plants with chlorine disinfection in Missouri by average flow, with permit expiry and three-year violation count.
#	Facility	City	Avg flow (MGD)	NPDES permit	Expires	Violations (3y)
1	Metropolitan St. Louis Sewer District Bissell Point WWTP	St. Louis	90.1	MO0025178	Aug 2031	14
2	MSD Coldwater WWTP	Florissant	14.3	MO0025160	Aug 2031	1
3	Kc, Westside WWTP	Kansas City	12.54	MO0024929	Jun 2026	2
4	Metropolitan St Louis Sewer District-Grand Glaize Wastewater Treatment Plant	Valley Park	10.4	MO0101362	Aug 2031	0
5	MSD Lower Meramec WWTP	St. Louis	7.6	MO0127949	Aug 2031	0
6	Rock Creek Waste Treatment	Independence	5.07	MO0089681	Mar 2024	12
7	Hannibal Pws	Hannibal	2.69	MO0093513	Apr 2023	0
8	Branson Compton Drive WWTP	Branson	2.26	MO0025241	Sep 2024	1
9	Neosho WWTP	Neosho	2	MO0104906	Apr 2022	27
10	Sunny Slope Country Club Drive WWTP	Camdenton	1.35	MO0130591	Jun 2024	0
11	Chillicothe WWTP	Chillicothe	0.96	MO0108227	Jun 2022	0
12	Shawnee Bend	Sunrise Beach	0.6	MO0123722	Dec 2027	8
13	Bakersfield WWTP	Bakersfield	0.51	MO0128368	Apr 2028	25
14	Cleveland	Cleveland	0.49	MO0111287	Mar 2026	47
15	Lexington WWTF	Lexington	0.32	MO0025216	Dec 2023	1
16	Doniphan Municipal WWTF	Doniphan	0.27	MO0047350	May 2029	6
17	Marble Hill WWTF	Marble Hill	0.2	MO0109762	Sep 2030	19
18	Normac Sewer District WWTP	Camdenton	0.16	MO0131091	Jun 2024	0
19	Ellington WWTF	Ellington	0.14	MO0022896	Dec 2024	80
20	Braymer WWTF	Braymer	0.14	MO0028061	Jul 2027	169
21	Exeter	Exeter	0.11	MO0086291	Dec 2025	91
22	Hopkins WWTF	Hopkins	0.09	MO0054755	Mar 2023	374
23	Unionville Pws	Unionville	0.09	MO0026646	Apr 2029	30
24	Bland Pws	Bland	0.08	MO0055395	Mar 2025	61
25	Cgcrcsd, Cedar Meadows Subdivision WWTF	Jackson	0.08	MO0130729	Dec 2027	11

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.

Missouri plants with chlorine disinfection recorded as a planned process.
Facility	City	Avg flow (MGD)	NPDES permit	Expires
Republic WWTP	Republic	1.38	MO0022098	Jul 2029
Blythedale WWTF	Blythedale	0.13	MO0123081	Jan 2031
Selma Village WWTF	Crystal City	0.1	MO0088854	Jun 2022
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.

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Other technologies in Missouri

Lagoon systems (290)Activated sludge and clarifiers (97)Oxidation ditches (57)Anaerobic digesters and biogas (26)UV disinfection (297)Nutrient removal (23)

Chlorine disinfection in other states

Maine (45)West Virginia (36)Florida (30)Vermont (27)Massachusetts (25)Kentucky (18)Texas (14)Arizona (12)Georgia (11)Alaska (6)Mississippi (5)

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 September 11, 2026.

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