What is the largest wastewater treatment plant in Mississippi?

West Rankin Utility Authority WWTF in Richland, treating an average of 10.32 MGD under NPDES permit MS0061743. Dcrua, Short Fork WWTF in Hernando is second at 6.5 MGD.

How much wastewater do Mississippi’s largest plants treat?

The 50 largest plants treat 70 MGD combined, 100% of the flow reported by all 127 publicly owned plants in Mississippi.

How is plant size measured?

By reported average daily flow in million gallons per day (MGD) from EPA discharge monitoring reports, the standard measure of a plant’s size. Design capacity, the flow a plant is permitted to treat, is usually higher and is shown on each profile.

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The 50 largest wastewater treatment plants in Mississippi

Name: Largest wastewater treatment plants in Mississippi
Creator: Klarifi
License: https://klarifi.io/terms-of-service

Ranked by average flow · 70 MGD combined · 100% of the state's reported flow

West Rankin Utility Authority WWTF in Richland is the largest publicly owned wastewater treatment plant in Mississippi by reported average flow, treating about 10.32 million gallons per day. The 50 plants below treat 70 MGD between them, 100% of the flow reported by all 127 plants in the state, and serve about 156,614 people. Every plant links to its profile with permit, technology and compliance data.

All plants in Mississippi →The 100 largest US plants →Mississippi NPDES permits →

The 50 largest publicly owned wastewater treatment plants in Mississippi by average flow (MGD), with population served, NPDES permit, expiry, treatment technology and three-year violation count.
#	Facility	City	Avg flow (MGD)	Population	NPDES permit	Expires	Technology	Violations (3y)
1	West Rankin Utility Authority WWTF	Richland	10.32	—	MS0061743	Feb 2030	Clarifiers, Uncovered lagoons	4
2	Dcrua, Short Fork WWTF	Hernando	6.5	—	MS0062227	Jun 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	114
3	Meridian POTW	Meridian	5.41	—	MS0020117	Oct 2030	Clarifiers, Aerated lagoons, Uncovered lagoons	40
4	Canton Mun Util-Beatties Bluff WWTF	Canton	4.54	—	MS0057517	Dec 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	375
5	Jcua - West Jackson County WWTP	Pascagoula	4.4	18,515	MS0045446	Dec 2029	Clarifiers	16
6	West Biloxi Wastewater Treatment Plant	Biloxi	4.07	—	MS0030333	Jun 2028	Clarifiers	1
7	Harrison County Wastewater And Solid Waste Management Authority, East Biloxi Pot	Biloxi	2.85	37,000	MS0023159	Mar 2029	Clarifiers, Aerated lagoons, Uncovered lagoons	0
8	Laurel Potw, Number 1	Laurel	2.8	—	MS0024163	Apr 2031	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	0
9	Hcua, Long Beach And Pass Christian	Pass Christian	2.4	—	MS0043141	May 2030	Clarifiers, Carrousels / oxidation ditches	0
10	Natchez POTW	Natchez	2.31	—	MS0024252	Mar 2028	Clarifiers, Uncovered lagoons	0
11	City Of Greenwood - Wastewater Treatment Plant	Greenwood	2.12	—	MS0023833	Dec 2029	Uncovered lagoons	0
12	Corinth POTW	Corinth	2.02	—	MS0061328	Apr 2029	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	149
13	Brookhaven POTW	Brookhaven	1.73	12,423	MS0024147	Feb 2031	Clarifiers, Carrousels / oxidation ditches	1
14	Jackson POTW - Trahon And Big Creek WWTF	Jackson	1.7	14,931	MS0044059	Jul 2026	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	24
15	Clarksdale POTW	Clarksdale	1.31	20,550	MS0020311	Apr 2028	Clarifiers, Biogas silos	154
16	Morton POTW	Morton	1.17	3,365	MS0036234	Nov 2029	Aerated lagoons, Uncovered lagoons	53
17	Aberdeen East WWTP	Aberdeen	0.98	—	MS0055581	Jul 2024	—	5
18	Bay Springs Industrial Park	Bay Springs	0.98	—	MS0034860	Mar 2029	Clarifiers, Uncovered lagoons	0
19	Reynolds R. Ridgely Wastewater Plant	Columbus	0.96	—	MS0056472	Dec 2030	Clarifiers, Uncovered lagoons	2
20	Indianola POTW	Indianola	0.78	—	MS0024619	Oct 2028	—	719
21	Diamondhead Water Sewer District	Diamondhead	0.75	—	MS0046078	Feb 2028	Clarifiers	0
22	Saltillo POTW	Saltillo	0.72	2,376	MS0021733	Mar 2025	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	21
23	Desoto County Regional Utility Authority, Johnson Creek Wastewater Treatment Fac	Walls	0.71	21,000	MS0061271	Jun 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	3
24	Tunica County Utility District	Robinsonville	0.69	—	MS0048691	Nov 2029	Clarifiers, Carrousels / oxidation ditches	30
25	Batesville POTW	Batesville	0.68	7,813	MS0024627	Sep 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	9
26	Pearl River Wastewater Treatment Plant	Philadelphia	0.67	—	MS0053503	Mar 2030	—	40
27	Pearl River County Utility Authority, Neal Road POTW	Picayune	0.65	—	MS0061174	Nov 2028	Clarifiers, Carrousels / oxidation ditches	0
28	Jackson County Utility Authority, POTW 6c	Moss Point	0.6	—	MS0021521	Aug 2030	Clarifiers	8
29	Florence POTW	Florence	0.59	—	MS0025275	Dec 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	35
30	Waynesboro POTW	Waynesboro	0.53	—	MS0024228	Jan 2028	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	30
31	Pontotoc, City Of, Activated Sludge Facility	Pontotoc	0.5	—	MS0058581	Apr 2024	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	13
32	Amory POTW	Amory	0.47	—	MS0045489	Apr 2030	Uncovered lagoons	226
33	South Woolmarket Water Reclamation Facility	Biloxi	0.43	6,380	MS0061204	Jul 2029	Clarifiers, Carrousels / oxidation ditches	0
34	Metro Desoto Utilities	Olive Branch	0.39	—	MS0028479	May 2029	Uncovered lagoons	210
35	Long Beach Industrial District Park	Long Beach	0.35	—	MS0022373	Sep 2027	—	13
36	Houston POTW	Houston	0.28	—	MS0025071	Oct 2027	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	1
37	Hcua, Northern Regional WWTP	Kiln	0.26	—	MS0061239	May 2029	Clarifiers, Carrousels / oxidation ditches	7
38	Water Valley POTW	Water Valley	0.25	—	MS0022331	Jun 2029	Aerated lagoons, Uncovered lagoons	42
39	Chickasaw Trail WWTP	Byhalia	0.24	—	MS0060046	Dec 2030	—	68
40	Hancock Co Port & Harbor Commission	Bay Saint Louis	0.19	—	MS0059501	Jul 2031	—	0
41	New Harmony WWTP	Philadelphia	0.12	—	MS0058645	Mar 2030	—	75
42	Como POTW	Como	0.12	—	MS0030104	Oct 2026	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	114
43	Neshoba County	Philadelphia	0.09	—	MS0043478	Mar 2028	Clarifiers	58
44	Inverness POTW	Inverness	0.09	—	MS0020320	Apr 2031	Uncovered lagoons	45
45	Lafayette County Industrial Park	Oxford	0.09	—	MS0043079	Oct 2029	Aerated lagoons, Uncovered lagoons	14
46	Cleary Heights POTW	Florence	0.08	—	MS0036307	Jul 2025	Clarifiers, Carrousels / oxidation ditches	27
47	Harrison County School District	Gulfport	0.08	9,121	MS0061191	Apr 2029	Clarifiers, Carrousels / oxidation ditches	3
48	Jumpertown, Town Of, WWTF	Booneville	0.06	657	MS0057096	Apr 2027	Uncovered lagoons	8
49	Harrison County Utility Authority, Tradition Development	Gulfport	0.05	2,483	MS0057011	Aug 2030	Clarifiers, Carrousels / oxidation ditches	1
50	Conehatta School WWTF	Conehatta	0.03	—	MS0057649	Dec 2027	—	31

Largest plants 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 September 11, 2026.

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