What is the largest wastewater treatment plant in Arkansas?

Fayetteville/ West Side WWTP in Fayetteville, treating an average of 10.72 MGD under NPDES permit ARL050288. Fort Smith, City Of - P Street Water Reclamation Facility in Fort Smith is second at 9.89 MGD.

How much wastewater do Arkansas’s largest plants treat?

The 50 largest plants treat 120 MGD combined, 89% of the flow reported by all 321 publicly owned plants in Arkansas.

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 Arkansas

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

Ranked by average flow · 120 MGD combined · 89% of the state's reported flow

Fayetteville/ West Side WWTP in Fayetteville is the largest publicly owned wastewater treatment plant in Arkansas by reported average flow, treating about 10.72 million gallons per day. The 50 plants below treat 120 MGD between them, 89% of the flow reported by all 321 plants in the state, and serve about 805,053 people. Every plant links to its profile with permit, technology and compliance data.

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

The 50 largest publicly owned wastewater treatment plants in Arkansas 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	Fayetteville/ West Side WWTP	Fayetteville	10.72	49,043	ARL050288	Dec 2030	Clarifiers, Carrousels / oxidation ditches, Biogas silos	0
2	Fort Smith, City Of - P Street Water Reclamation Facility	Fort Smith	9.89	50,271	ARL033278	Dec 2030	Clarifiers, Biogas silos	2
3	City Of Hot Springs Regional Wastewater Treatment Plant	Hot Springs	7.79	35,536	AR0033880	Jun 2029	Clarifiers	84
4	Pine Bluff WW Utility-Boyd Pt	Pine Bluff	7.62	47,850	ARL033316	Dec 2030	Aerated lagoons, Uncovered lagoons	16
5	Fayetteville - Noland WWTP	Fayetteville	6.81	57,022	AR0020010	Apr 2029	Clarifiers, Uncovered lagoons, Biogas balloons	6
6	Fort Smith, City Of-Massard Water Reclamation Facility	Barling	6.78	40,899	AR0021750	Feb 2026	Clarifiers, Biogas silos	37
7	Lrwra-Fourche Creek Water Reclamation Facility	Little Rock	6.57	58,729	AR0040177	Jul 2025	Clarifiers, Uncovered lagoons, Biogas silos	0
8	Russellville WWTP	Russellville	4.2	30,473	ARL021768	Dec 2030	Clarifiers, Aerated lagoons, Biogas silos	46
9	West Memphis Wastewater Treatment Facility	West Memphis	4	24,559	AR0022039	Oct 2029	—	19
10	Benton WWTP	Benton	3.84	35,011	AR0036498	Mar 2026	Clarifiers, Carrousels / oxidation ditches	4
11	Northwest Arkansas Conservation Authority -Regional WWTP	Bentonville	3.26	29,333	AR0050024	Dec 2026	Clarifiers, Carrousels / oxidation ditches, Biogas balloons	158
12	Searcy Wastewater Treatment Plant	Searcy	3.24	23,014	AR0021601	Apr 2024	Clarifiers, Aerated lagoons, Uncovered lagoons	12
13	Jacksonville Wastewater Utility	Jacksonville	3	29,469	AR0041335	Jan 2029	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	0
14	Tucker Creek Wastewater Treatment Plant	Conway	2.96	14,641	ARL047279	Dec 2030	Aerated lagoons	11
15	Green Forest, City Of - Green Forest WWTP	Green Forest	2.51	2,981	AR0021741	Mar 2027	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches, Biogas silos	0
16	Osceola WWTP	Osceola	2.5	6,976	AR0021580	Sep 2028	—	14
17	Nlrwu-White Oak Bayou	North Little Rock	2.45	39,310	AR0038288	Jul 2028	Clarifiers, Aerated lagoons	0
18	Dequeen, City Of	De Queen	2.29	6,098	AR0021733	Mar 2025	Clarifiers, Aerated lagoons, Uncovered lagoons	57
19	Lrwra-Little Maumelle Water Reclamation Facility	Little Rock	1.92	14,176	AR0050849	Dec 2024	—	0
20	Cwl-West Side Wastewater Treatment Plant	Jonesboro	1.91	31,410	AR0037907	Mar 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	3
21	Mountain Home Wastewater Treatment Plant	Mountain Home	1.86	12,802	ARL021211	Dec 2030	Clarifiers, Carrousels / oxidation ditches	0
22	Huntsville WWTF	Huntsville	1.65	2,808	ARL022004	Dec 2030	Uncovered lagoons	20
23	Nlr Wastewater Utility - Maumelle Water Management	Maumelle	1.64	19,274	ARL033626	Dec 2030	Clarifiers, Aerated lagoons, Uncovered lagoons	0
24	Mena Wastewater Treatment Facility	Mena	1.4	5,588	AR0036692	Nov 2027	Aerated lagoons	16
25	Marion, City Of	Marion	1.33	14,007	AR0021971	Dec 2028	Aerated lagoons, Uncovered lagoons	95
26	Berryville, City Of-WWTP	Berryville	1.32	5,663	AR0021792	Oct 2021	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	2
27	Newport, City Of	Newport	1.31	7,981	AR0037044	Sep 2027	Aerated lagoons	9
28	Camden, Arkansas Water Treatment Plant	Camden	1.21	10,548	AR0022365	Dec 2028	Clarifiers, Carrousels / oxidation ditches	0
29	Helena Water Sewer	Helena	1.2	5,567	ARL043389	Dec 2030	—	23
30	Clarksville Connected Utilities - Pollution Control Facility	Clarksville	1.1	9,408	ARL022187	Dec 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	2
31	Eudora, City Of	Eudora	0.81	1,716	AR0033839	Mar 2026	Uncovered lagoons	47
32	Ozark, City Of	Ozark	0.77	3,542	AR0021563	Aug 2024	Clarifiers, Biogas silos	2
33	Blytheville Sewer Dept.-South WWTP	Blytheville	0.77	4,836	AR0022578	Jun 2024	Aerated lagoons, Uncovered lagoons	34
34	Greenwood, City Of	Greenwood	0.74	9,392	AR0022454	Jun 2028	Clarifiers, Aerated lagoons, Uncovered lagoons	8
35	Beebe Water And Sewer Commission	Beebe	0.74	8,440	AR0022101	Jun 2029	—	58
36	Paris WWTP	Paris	0.73	3,207	AR0021857	May 2026	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	30
37	Gentry WWTP	Gentry	0.72	3,804	AR0020184	Sep 2023	Clarifiers, Aerated lagoons, Uncovered lagoons	58
38	Oak Grove Heights, City Of - Oak Grove Heights Wastewater Treatment Facility	Paragould	0.6	916	AR0045837	Oct 2027	Uncovered lagoons	4
39	City Of Sherwood-North Facility	Sherwood	0.59	1,840	AR0037176	Feb 2030	Uncovered lagoons	19
40	Pea Ridge, City Of	Pea Ridge	0.57	6,615	AR0020672	Jun 2029	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	0
41	Greenbrier Waterworks-Booster Chlorination Mm #1	Greenbrier	0.52	5,747	AR0036536	Jun 2029	Aerated lagoons, Uncovered lagoons	50
42	Prescott WWTP	Prescott	0.49	3,069	AR0033481	Feb 2029	—	1
43	Dardanelle, City Of	Dardanelle	0.48	4,508	AR0033421	Jun 2025	Clarifiers	0
44	Wrightsville, City Of	Wrightsville	0.46	2,671	AR0051021	Feb 2031	Aerated lagoons	90
45	Pocahontas Waterworks	Pocahontas	0.43	7,381	AR0034835	Apr 2024	Uncovered lagoons	34
46	Lincoln, City Of	Lincoln	0.43	2,465	AR0035246	Sep 2030	Clarifiers, Carrousels / oxidation ditches	10
47	Vilonia WWTP	Vilonia	0.41	4,321	AR0047121	Jul 2025	Uncovered lagoons	65
48	Mulberry, City Of	Mulberry	0.41	1,532	AR0034932	Dec 2028	Aerated lagoons, Uncovered lagoons	43
49	West Helena Water Utilities	West Helena	0.4	5,766	ARL022021	Dec 2030	—	43
50	Mountain View WWTP	Mountain View	0.39	2,838	AR0020117	Jan 2029	Clarifiers, Carrousels / oxidation ditches	50

Largest plants in Arkansas: 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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