How many wastewater treatment plants are there in Arkansas?

Klarifi tracks 321 publicly owned wastewater treatment plants in Arkansas with a combined average flow of 135 million gallons per day, serving about 1,169,550 residents. 30 of them treat more than 1 MGD and 1 more than 10 MGD.

What is the largest wastewater treatment plant in Arkansas?

Fayetteville/ West Side WWTP in Fayetteville is the largest plant in Arkansas by average flow, treating about 10.72 MGD.

What treatment technologies are common in Arkansas?

238 of Arkansas's plants use lagoon systems and 13 have biogas or anaerobic digestion infrastructure, based on Klarifi's aerial imagery review.

How many NPDES permits in Arkansas are up for renewal?

60 permits held by Arkansas plants expire in 2026 and 45 in 2027. Renewals typically bring new limits and trigger upgrade projects.

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Wastewater Treatment Plants in Arkansas

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

321 facilities · 135 MGD combined flow

Klarifi tracks 321 publicly owned wastewater treatment plants in Arkansas with a combined average flow of 135 MGD, serving about 1,169,550 residents. 30 plants treat more than 1 MGD and 1 more than 10 MGD; 238 use lagoon systems and 13 have digesters or biogas infrastructure. The largest is Fayetteville/ West Side WWTP in Fayetteville at 10.72 MGD. 60 NPDES permits expire this year and 45 next year.

Every plant below links to a profile with average and design flow, treatment technology, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Showing facilities 1–200 of 321 by average flow — browse the rest with the page links below.

321 plant locations in Arkansas; dot size follows average flow.

NPDES permits and renewals in Arkansas

Every plant discharges under an NPDES permit that is renewed every five years, usually with tighter limits. The renewal year is the year a plant budgets for upgrades.

All NPDES permits in Arkansas →60 permits expiring in 2026 →45 permits expiring in 2027 →31 permits expiring in 2028 →Find plants near you on the map →

Largest wastewater treatment plants in Arkansas

The 25 largest publicly owned wastewater treatment plants in Arkansas by average flow, with NPDES permit, expiry, treatment technology and three-year violation count. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Fayetteville/ West Side WWTP	Fayetteville	10.72	—	ARL050288	Dec 2030	Clarifiers, Carrousels / oxidation ditches, Biogas silos	0
Fort Smith, City Of - P Street Water Reclamation Facility	Fort Smith	9.89	—	ARL033278	Dec 2030	Clarifiers, Biogas silos	2
City Of Hot Springs Regional Wastewater Treatment Plant	Hot Springs	7.79	12	AR0033880	Jun 2029	Clarifiers	84
Pine Bluff WW Utility-Boyd Pt	Pine Bluff	7.62	—	ARL033316	Dec 2030	Aerated lagoons, Uncovered lagoons	16
Fayetteville - Noland WWTP	Fayetteville	6.81	12.6	AR0020010	Apr 2029	Clarifiers, Uncovered lagoons, Biogas balloons	6
Fort Smith, City Of-Massard Water Reclamation Facility	Barling	6.78	10	AR0021750	Feb 2026	Clarifiers, Biogas silos	37
Lrwra-Fourche Creek Water Reclamation Facility	Little Rock	6.57	16	AR0040177	Jul 2025	Clarifiers, Uncovered lagoons, Biogas silos	0
Russellville WWTP	Russellville	4.2	—	ARL021768	Dec 2030	Clarifiers, Aerated lagoons, Biogas silos	46
West Memphis Wastewater Treatment Facility	West Memphis	4	6.3	AR0022039	Oct 2029	—	19
Benton WWTP	Benton	3.84	8.3	AR0036498	Mar 2026	Clarifiers, Carrousels / oxidation ditches	4
Northwest Arkansas Conservation Authority -Regional WWTP	Bentonville	3.26	—	AR0050024	Dec 2026	Clarifiers, Carrousels / oxidation ditches, Biogas balloons	158
Searcy Wastewater Treatment Plant	Searcy	3.24	5	AR0021601	Apr 2024	Clarifiers, Aerated lagoons, Uncovered lagoons	12
Jacksonville Wastewater Utility	Jacksonville	3	12.31	AR0041335	Jan 2029	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	0
Tucker Creek Wastewater Treatment Plant	Conway	2.96	—	ARL047279	Dec 2030	Aerated lagoons	11
Green Forest, City Of - Green Forest WWTP	Green Forest	2.51	4	AR0021741	Mar 2027	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches, Biogas silos	0
Osceola WWTP	Osceola	2.5	3.25	AR0021580	Sep 2028	—	14
Nlrwu-White Oak Bayou	North Little Rock	2.45	8.5	AR0038288	Jul 2028	Clarifiers, Aerated lagoons	0
Dequeen, City Of	De Queen	2.29	4	AR0021733	Mar 2025	Clarifiers, Aerated lagoons, Uncovered lagoons	57
Lrwra-Little Maumelle Water Reclamation Facility	Little Rock	1.92	4	AR0050849	Dec 2024	—	0
Cwl-West Side Wastewater Treatment Plant	Jonesboro	1.91	3	AR0037907	Mar 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	3
Mountain Home Wastewater Treatment Plant	Mountain Home	1.86	—	ARL021211	Dec 2030	Clarifiers, Carrousels / oxidation ditches	0
Huntsville WWTF	Huntsville	1.65	—	ARL022004	Dec 2030	Uncovered lagoons	20
Nlr Wastewater Utility - Maumelle Water Management	Maumelle	1.64	—	ARL033626	Dec 2030	Clarifiers, Aerated lagoons, Uncovered lagoons	0
Mena Wastewater Treatment Facility	Mena	1.4	3.1	AR0036692	Nov 2027	Aerated lagoons	16
Marion, City Of	Marion	1.33	1.6	AR0021971	Dec 2028	Aerated lagoons, Uncovered lagoons	95

The 50 largest plants in Arkansas →

Arkansas plants by treatment technology

Lagoon systems (238)Activated sludge and clarifiers (49)Oxidation ditches (28)Anaerobic digesters and biogas (13)

All 321 plants in Arkansas

Facility	City	Flow (MGD)
Fayetteville/ West Side WWTP	Fayetteville	10.72
Fort Smith, City Of - P Street Water Reclamation Facility	Fort Smith	9.89
City Of Hot Springs Regional Wastewater Treatment Plant	Hot Springs	7.79
Pine Bluff WW Utility-Boyd Pt	Pine Bluff	7.62
Fayetteville - Noland WWTP	Fayetteville	6.81
Fort Smith, City Of-Massard Water Reclamation Facility	Barling	6.78
Lrwra-Fourche Creek Water Reclamation Facility	Little Rock	6.57
Russellville WWTP	Russellville	4.2
West Memphis Wastewater Treatment Facility	West Memphis	4
Benton WWTP	Benton	3.84
Northwest Arkansas Conservation Authority -Regional WWTP	Bentonville	3.26
Searcy Wastewater Treatment Plant	Searcy	3.24
Jacksonville Wastewater Utility	Jacksonville	3
Tucker Creek Wastewater Treatment Plant	Conway	2.96
Green Forest, City Of - Green Forest WWTP	Green Forest	2.51
Osceola WWTP	Osceola	2.5
Nlrwu-White Oak Bayou	North Little Rock	2.45
Dequeen, City Of	De Queen	2.29
Lrwra-Little Maumelle Water Reclamation Facility	Little Rock	1.92
Cwl-West Side Wastewater Treatment Plant	Jonesboro	1.91
Mountain Home Wastewater Treatment Plant	Mountain Home	1.86
Huntsville WWTF	Huntsville	1.65
Nlr Wastewater Utility - Maumelle Water Management	Maumelle	1.64
Mena Wastewater Treatment Facility	Mena	1.4
Marion, City Of	Marion	1.33
Berryville, City Of-WWTP	Berryville	1.32
Newport, City Of	Newport	1.31
Camden, Arkansas Water Treatment Plant	Camden	1.21
Helena Water Sewer	Helena	1.2
Clarksville Connected Utilities - Pollution Control Facility	Clarksville	1.1
Eudora, City Of	Eudora	0.81
Ozark, City Of	Ozark	0.77
Blytheville Sewer Dept.-South WWTP	Blytheville	0.77
Greenwood, City Of	Greenwood	0.74
Beebe Water And Sewer Commission	Beebe	0.74
Paris WWTP	Paris	0.73
Gentry WWTP	Gentry	0.72
Oak Grove Heights, City Of - Oak Grove Heights Wastewater Treatment Facility	Paragould	0.6
City Of Sherwood-North Facility	Sherwood	0.59
Pea Ridge, City Of	Pea Ridge	0.57
Greenbrier Waterworks-Booster Chlorination Mm #1	Greenbrier	0.52
Prescott WWTP	Prescott	0.49
Dardanelle, City Of	Dardanelle	0.48
Wrightsville, City Of	Wrightsville	0.46
Pocahontas Waterworks	Pocahontas	0.43
Lincoln, City Of	Lincoln	0.43
Vilonia WWTP	Vilonia	0.41
Mulberry, City Of	Mulberry	0.41
West Helena Water Utilities	West Helena	0.4
Mountain View WWTP	Mountain View	0.39
Brookland WWTP	Brookland	0.36
Sherwood, City Of-South Facility	Sherwood	0.36
Ward, City Of	Ward	0.34
Danville WWTP	Danville	0.34
Booneville, City Of	Booneville	0.34
Eureka Springs, City Of	Eureka Springs	0.34
Waldron, City Of	Waldron	0.33
Lewisville, City Of	Lewisville	0.32
Lake City, City Of	Lake City	0.3
Gravel Ridge Sid #213	Gravel Ridge	0.3
Runyan Sid #211	Gravel Ridge	0.29
Des Arc, City Of	Des Arc	0.28
Mayflower, City Of	Mayflower	0.28
Walnut Ridge WW Treatment Plnt	Walnut Ridge	0.28
Shannon Hills WWTP	Shannon Hills	0.27
Lavaca, City Of- Lavaca Municipal Wastewater Treatment Plant	Lavaca	0.26
Ola WWTP	Ola	0.26
Trumann WWTP	Trumann	0.25
Holiday Island Sid-WWTP	Holiday Island	0.25
Piggott Waterworks	Piggott	0.25
Clinton East WW Treatment Facility	Clinton	0.25
Dermott WWTP	Dermott	0.24
Fordyce, City Of	Fordyce	0.24
Dierks WWTP	Dierks	0.22
Perryville, City Of-STP	Perryville	0.21
Bald Knob, City Of - Wastewater Treatment Facility	Bald Knob	0.21
Cotter-Gassville WWTP	Cotter	0.2
Glenwood, City Of	Glenwood	0.2
Lake Village WWTP	Lake Village	0.2
Yellville, City Of	Yellville	0.2
Charleston, City Of	Charleston	0.2
Rector, City Of - Rector Wastewater Treatment Facility	Rector	0.19
Haskell - North WWTP	Haskell	0.19
Augusta WWTP	Augusta	0.19
Bull Shoals WWTP	Bull Shoals	0.18
Manila WWTP	Manila	0.18
Carlisle, City Of	Carlisle	0.18
Star City WWTP	Star City	0.17
Gravette, City Of	Gravette	0.16
Smackover WWTP	Smackover	0.15
Southside Public Water Authority - Wastewater Treatment Plant	Batesville	0.15
Melbourne, City Of-WWTP	Melbourne	0.15
Wilmar, City Of	Wilmar	0.15
Marshall WWTP	Marshall	0.15
Mansfield, City Of	Mansfield	0.14
England, City Of	England	0.13
Pottsville, City Of	Pottsville	0.13
Bono, City Of	Bono	0.13
Huntington Sanitary Sewerage Facilities	Huntington	0.12
Gillham Regional Wastewater District	Gillham	0.12
Amity, City Of	Amity	0.12
Austin WWTP	Austin	0.12
Dyess WWTP	Dyess	0.12
Stephens, City Of	Stephens	0.12
Salem, City Of	Salem	0.11
Leachville WWTP	Leachville	0.11
Hazen WWTP	Hazen	0.11
Saline County Waterworks And Sanitary Sewer Public Facilities Board	Alexander	0.11
Redfield WWTP	Redfield	0.1
Bay WWTP	Bay	0.1
Mount Ida WWTP	Mount Ida	0.1
Lamar, City Of	Lamar	0.1
Kensett, City Of-WWTP	Kensett	0.1
Donaldson, Town Of	Donaldson	0.1
Coal Hill, City Of-WWTP	Coal Hill	0.1
Subiaco,city Of	Subiaco	0.1
Cave City WWTP	Cave City	0.09
Monticello WWTP East Plant	Monticello	0.09
Flippin WWTP	Flippin	0.08
Hot Springs SW WWTP	Hot Springs	0.08
Viola, City Of	Viola	0.07
Hardy WWTP	Hardy	0.07
Highland WWTP	Cherokee Village	0.07
Ash Flat WWTP	Ash Flat	0.07
Atkins, City Of - South Wastewater Treatment Plant	Atkins	0.07
Joiner, City Of-WWTP	Joiner	0.07
Palestine Water Utility	Palestine	0.06
Quitman WWTP	Quitman	0.06
Hatfield WWTP	Hatfield	0.05
Mammoth Spring WWTP	Mammoth Spring	0.05
London Pollution Control Fac.	London	0.05
Tri County Regional Water Distribution District - Plainview WWTP	Plainview	0.05
Jasper WWTP	Jasper	0.04
Menifee WWTP	Menifee	0.04
Horseshoe Bend WWTP	Horseshoe Bend	0.04
Altheimer WWTP	Altheimer	0.04
Lost Bridge Vill Wat-Sew Dists-Chlorine At Well #1	Garfield	0.04
Mcrae, City Of	Mcrae	0.04
Faulkner County Public Facility Board - D/b/a Preston Community WW Utility	Conway	0.04
Leslie, City Of	Leslie	0.04
Taylor, City Of	Taylor	0.04
Calion WWTP	Calion	0.04
Bauxite, Ar.Wwtf	Bauxite	0.03
Magazine, City Of	Magazine	0.03
Caraway, City Of	Caraway	0.03
Cotton Plant, City Of	Cotton Plant	0.03
Tillar, City Of	Tillar	0.03
Weiner, City Of	Weiner	0.03
Pinewood Sewer Improvement District (sid) #1	Pine Bluff	0.03
Sugarloaf Wastewater Treatment	Lead Hill	0.03
Hermitage WWTP	Hermitage	0.03
Western Lawrence Co Wwt Dist	Lynn	0.03
Cove, City Of	Cove	0.03
Crawfordsville, City Of	Crawfordsville	0.02
Waldo, City Of	Waldo	0.02
Bigelow, City Of	Bigelow	0.02
Norphlet WWTP	Norphlet	0.02
Calico Rock WWTP	Calico Rock	0.02
Wilson WWTP	Wilson	0.02
Mountainburg WWTP	Mountainburg	0.02
Pollard WWTP	Pollard	0.02
Diamondhead Resort-Wwt	Diamondhead	0.02
Rolling Hills Subdivision WWTP	Cabot	0.02
Hoxie, City Of	Hoxie	0.02
Mccrory, City Of	Mccrory	0.02
Tri-City Utilities, Inc.	O'Kean	0.02
Ravenden Springs WWTP	Ravenden Springs	0.02
Sulphur Springs WWTP	Sulphur Springs	0.01
Sulphur Rock WWTP	Sulphur Rock	0.01
Lafe WWTP	Lafe	0.01
Tantara #1 D/b/a Boggy Bayou Sid	Pine Bluff	0.01
Lochridge Estates WWTP	Little Rock	0.0097
Norman, City Of	Norman	0.009
Success WWTP	Success	0.009
Newark, City Of	Newark	0.0087
Emerson, City Of - Emerson Wwt	Emerson	0.008
Almyra WWTP	Almyra	0.0072
Horseshoe Bend - Paradise Acres STP	Horseshoe Bend	0.007
Carson Bridge Treatment Plant	Lonoke	0.006
Oxford Waterworks	Oxford	0.006
Rockport, City Of - WWTF	Rockport	0.006
Ulm WWTP	Ulm	0.0058
Letona Sanitary Sewer	Letona	0.0056
Portia Wastewater Treatment Plant	Portia	0.005
Higginson, Town Of	Higginson	0.0048
Norfork, City Of - WW Treatment Plant	Norfork	0.0046
Heinke Road Property Owners Sewer Improvement District No. 34	Mabelvale	0.004
Havana WWTP	Havana	0.0039
Oppelo, City Of - Oppelo Municipal Sewage Treatment Plant	Oppelo	0.0036
Burdette WWTP	Burdette	0.0036
Huttig WWTP	Huttig	0.0035
Nimmons WWTP	Nimmons	0.0031
Ravenden Wastewater Treatment Facility	Ravenden	0.0031
Van Buren Municipal Utilities, City Of - Lee Creek Industrial Park Trtmnt Plant	Van Buren	0.003
Banks, City Of	Banks	0.0028
Tinsman, Ar Wastewater Treatment Facility	Hampton	0.0027
Suburbia Sid #1	Pine Bluff	0.0023
Alicia, City Of	Alicia	0.0022
Amagon, City Of	Amagon	0.002
Felsenthal, City Of	Felsenthal	0.002

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Wastewater treatment 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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