How many wastewater treatment plants are there in Arkansas?

Klarifi tracks 324 publicly owned wastewater treatment plants in Arkansas with a combined average flow of 157 million gallons per day, serving about 1,181,737 residents. 34 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 10.18 MGD.

What treatment technologies are common in Arkansas?

235 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

324 facilities · 157 MGD combined flow

Klarifi tracks 324 publicly owned wastewater treatment plants in Arkansas with a combined average flow of 157 MGD, serving about 1,181,737 residents. 34 plants treat more than 1 MGD and 1 more than 10 MGD; 235 use lagoon systems and 13 have digesters or biogas infrastructure. The largest is Fayetteville/ West Side WWTP in Fayetteville at 10.18 MGD. 60 NPDES permits expire this year and 45 next year.

Every plant below links to a profile with average and design flow, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Treatment technology and verified contacts are shown with a free Klarifi account. Showing facilities 1–200 of 324 by average flow — browse the rest with the page links below.

324 plant locations in Arkansas; dot size follows average flow. Boundaries: U.S. Census Bureau.

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 →33 permits expiring in 2028 →Find plants near you on the map →

Largest wastewater treatment plants in Arkansas

The 10 largest publicly owned wastewater treatment plants in Arkansas by average flow, with NPDES permit, expiry and three-year violation count. Source: EPA ICIS-NPDES via Klarifi.
Facility	City	Avg flow (MGD)	Design (MGD)	NPDES permit	Expires	Violations (3y)
Fayetteville/ West Side WWTP	Fayetteville	10.18	—	ARL050288	Dec 2030	0
Fort Smith, City Of - P Street Water Reclamation Facility	Fort Smith	9.55	—	ARL033278	Dec 2030	4
City Of Hot Springs Regional Wastewater Treatment Plant	Hot Springs	9.53	12	AR0033880	Jun 2029	87
Fort Smith, City Of-Massard Water Reclamation Facility	Barling	8.03	10	AR0021750	Feb 2026	40
Pine Bluff WW Utility-Boyd Pt	Pine Bluff	7.33	—	ARL033316	Dec 2030	16
Lrwra-Fourche Creek Water Reclamation Facility	Little Rock	7.26	16	AR0040177	Jul 2025	0
Fayetteville - Noland WWTP	Fayetteville	6.32	12.6	AR0020010	Apr 2029	6
West Memphis Wastewater Treatment Facility	West Memphis	4.81	6.3	AR0022039	Oct 2029	19
Benton WWTP	Benton	4.49	8.3	AR0036498	Mar 2026	4
Northwest Arkansas Conservation Authority -Regional WWTP	Bentonville	3.99	—	AR0050024	Dec 2026	160

Treatment technology for each plant is shown with a free Klarifi account. Create one →

The 50 largest plants in Arkansas →EPA enforcement actions in Arkansas →

Arkansas plants by treatment technology

Lagoon systems (235)Activated sludge and clarifiers (49)Oxidation ditches (28)Anaerobic digesters and biogas (13)

All 324 plants in Arkansas

Facility	City	Flow (MGD)
Fayetteville/ West Side WWTP	Fayetteville	10.18
Fort Smith, City Of - P Street Water Reclamation Facility	Fort Smith	9.55
City Of Hot Springs Regional Wastewater Treatment Plant	Hot Springs	9.53
Fort Smith, City Of-Massard Water Reclamation Facility	Barling	8.03
Pine Bluff WW Utility-Boyd Pt	Pine Bluff	7.33
Lrwra-Fourche Creek Water Reclamation Facility	Little Rock	7.26
Fayetteville - Noland WWTP	Fayetteville	6.32
West Memphis Wastewater Treatment Facility	West Memphis	4.81
Benton WWTP	Benton	4.49
Northwest Arkansas Conservation Authority -Regional WWTP	Bentonville	3.99
Jacksonville Wastewater Utility	Jacksonville	3.97
Russellville WWTP	Russellville	3.97
Searcy Wastewater Treatment Plant	Searcy	3.2
Nlrwu-White Oak Bayou	North Little Rock	2.92
Tucker Creek Wastewater Treatment Plant	Conway	2.89
Green Forest, City Of - Green Forest WWTP	Green Forest	2.53
Osceola WWTP	Osceola	2.49
Dequeen, City Of	De Queen	2.24
Mountain Home Wastewater Treatment Plant	Mountain Home	2.1
Lrwra-Little Maumelle Water Reclamation Facility	Little Rock	2.01
Cwl-West Side Wastewater Treatment Plant	Jonesboro	1.84
Nlr Wastewater Utility - Maumelle Water Management	Maumelle	1.79
Mena Wastewater Treatment Facility	Mena	1.67
Marion, City Of	Marion	1.61
Camden, Arkansas Water Treatment Plant	Camden	1.47
Huntsville WWTF	Huntsville	1.36
Sheridan WW Treatment Plant	Sheridan	1.32
Hamburg, City Of	Hamburg	1.31
El Dorado, City Of- South Plant	Eldorado	1.28
Lonoke, City Of	Lonoke	1.25
West Helena Water Utilities	West Helena	1.15
Clarksville Connected Utilities - Pollution Control Facility	Clarksville	1.14
Berryville, City Of-WWTP	Berryville	1.12
Helena Water Sewer	Helena	1.1
Greenwood, City Of	Greenwood	0.99
Newport, City Of	Newport	0.97
Beebe Water And Sewer Commission	Beebe	0.84
Atkins Water Works-North WWTF	Atkins	0.84
Blytheville Sewer Dept.-South WWTP	Blytheville	0.84
Ozark, City Of	Ozark	0.74
Wrightsville, City Of	Wrightsville	0.72
Dewitt, City Of	Dewitt	0.71
Paris WWTP	Paris	0.69
Pea Ridge, City Of	Pea Ridge	0.64
Gentry WWTP	Gentry	0.61
Prescott WWTP	Prescott	0.59
Booneville, City Of	Booneville	0.59
Greenbrier Waterworks-Booster Chlorination Mm #1	Greenbrier	0.58
Lincoln, City Of	Lincoln	0.54
Waldron, City Of	Waldron	0.52
Murfreesboro WWTP	Murfreesboro	0.51
Mountain View WWTP	Mountain View	0.49
Earle Waterworks	Earle	0.48
Fordyce, City Of	Fordyce	0.48
Dardanelle, City Of	Dardanelle	0.48
City Of Sherwood-North Facility	Sherwood	0.47
Trumann WWTP	Trumann	0.47
Pocahontas Waterworks	Pocahontas	0.47
Rison WWTP	Rison	0.45
Dermott WWTP	Dermott	0.45
Vilonia WWTP	Vilonia	0.42
Ward, City Of	Ward	0.41
Clinton East WW Treatment Facility	Clinton	0.4
Danville WWTP	Danville	0.39
Sherwood, City Of-South Facility	Sherwood	0.39
Runyan Sid #211	Gravel Ridge	0.35
Lake City, City Of	Lake City	0.34
Shannon Hills WWTP	Shannon Hills	0.34
Bald Knob, City Of - Wastewater Treatment Facility	Bald Knob	0.33
Walnut Ridge WW Treatment Plnt	Walnut Ridge	0.31
Lewisville, City Of	Lewisville	0.31
Perryville, City Of-STP	Perryville	0.31
Carlisle, City Of	Carlisle	0.31
Dierks WWTP	Dierks	0.3
Charleston, City Of	Charleston	0.3
Mcgehee, City Of	Mcgehee	0.3
Haskell - North WWTP	Haskell	0.3
Piggott Waterworks	Piggott	0.3
Eureka Springs, City Of	Eureka Springs	0.3
Harrisburg WWTP	Harrisburg	0.29
Mulberry, City Of	Mulberry	0.28
Mayflower, City Of	Mayflower	0.28
Wilson WWTP	Wilson	0.27
Rector, City Of - Rector Wastewater Treatment Facility	Rector	0.26
Holiday Island Sid-WWTP	Holiday Island	0.26
Star City WWTP	Star City	0.25
Yellville, City Of	Yellville	0.25
Ola WWTP	Ola	0.25
Brookland WWTP	Brookland	0.24
Lavaca, City Of- Lavaca Municipal Wastewater Treatment Plant	Lavaca	0.24
Cotter-Gassville WWTP	Cotter	0.22
Keiser, City Of	Keiser	0.22
Mount Ida WWTP	Mount Ida	0.21
Des Arc, City Of	Des Arc	0.21
Manila WWTP	Manila	0.21
Gravel Ridge Sid #213	Gravel Ridge	0.21
Pottsville, City Of	Pottsville	0.21
Crossett Water Commission-WTP #1	Crossett	0.21
Saline County Waterworks And Sanitary Sewer Public Facilities Board	Alexander	0.2
Gravette, City Of	Gravette	0.2
Hampton, City Of	Hampton	0.2
Clarendon WWTP	Clarendon	0.19
Flippin WWTP	Flippin	0.19
Lake Village WWTP	Lake Village	0.19
Mansfield, City Of	Mansfield	0.18
Marmaduke, City Of	Marmaduke	0.18
Glenwood, City Of	Glenwood	0.18
Devalls Bluff, City Of	De Valls Bluff	0.18
Augusta WWTP	Augusta	0.17
Huntington Sanitary Sewerage Facilities	Huntington	0.16
Bull Shoals WWTP	Bull Shoals	0.16
Gurdon, City Of	Gurdon	0.16
Pangburn, City Of	Pangburn	0.16
Hoxie, City Of	Hoxie	0.15
Hazen WWTP	Hazen	0.15
Southside Public Water Authority - Wastewater Treatment Plant	Batesville	0.15
Caddo Valley WWTP	Caddo Valley	0.15
Lockesburg, City Of	Lockesburg	0.15
Bono, City Of	Bono	0.15
Donaldson, Town Of	Donaldson	0.14
Melbourne, City Of-WWTP	Melbourne	0.14
Marshall WWTP	Marshall	0.14
Eudora, City Of	Eudora	0.14
Smackover WWTP	Smackover	0.13
Tuckerman, City Of - Wastewater Treatment Plant	Tuckerman	0.13
Gillham Regional Wastewater District	Gillham	0.13
Bay WWTP	Bay	0.13
Austin WWTP	Austin	0.13
Salem, City Of	Salem	0.13
Gosnell WWTP	Gosnell	0.13
England, City Of	England	0.13
Hot Springs SW WWTP	Hot Springs	0.12
Atkins, City Of - South Wastewater Treatment Plant	Atkins	0.12
Stephens, City Of	Stephens	0.12
Kensett, City Of-WWTP	Kensett	0.12
Strong WWTP	Strong	0.11
Mountain Pine, City Of - WWTP	Mountain Pine	0.11
Leachville WWTP	Leachville	0.11
Redfield WWTP	Redfield	0.11
Junction City, City Of	Junction City	0.1
Lamar, City Of	Lamar	0.1
Dyess WWTP	Dyess	0.1
Luxora WWTP	Luxora	0.09
Arkansas City, City Of-WWTF	Arkansas City	0.09
Cave City WWTP	Cave City	0.09
Bearden WWTP	Bearden	0.09
Viola, City Of	Viola	0.09
Fountain Hill, City	Fountain Hill	0.09
Amity, City Of	Amity	0.08
Foreman, City Of - Foreman Municipal WWTF	Foreman	0.08
Poyen, City Of	Poyen	0.08
Sparkman, City Of	Sparkman	0.08
Ash Flat WWTP	Ash Flat	0.08
Tyronza WWTP	Tyronza	0.08
Higginson, Town Of	Higginson	0.08
Joiner, City Of-WWTP	Joiner	0.07
Marked Tree WWTP	Marked Tree	0.07
Delight, City Of	Delight	0.07
Judsonia, City Of	Judsonia	0.07
Hardy WWTP	Hardy	0.07
Emmet, City Of	Emmet	0.07
Highland WWTP	Cherokee Village	0.06
Quitman WWTP	Quitman	0.06
Altheimer WWTP	Altheimer	0.06
Birdsong, City Of WWTP	Birdsong	0.06
Subiaco,city Of	Subiaco	0.06
Palestine Water Utility	Palestine	0.06
Harrell WWTP	Harrell	0.06
Hughes, City Of	Hughes	0.06
Horseshoe Bend WWTP	Horseshoe Bend	0.06
Wheatley, City Of	Wheatley	0.06
Gillett, City Of-WWTP	Gillett	0.06
Caraway, City Of	Caraway	0.05
Gould, City Of-WWTF	Gould	0.05
Magazine, City Of	Magazine	0.05
Black Rock WW Treatment Fac.	Black Rock	0.05
London Pollution Control Fac.	London	0.05
Blevins WWTP	Blevins	0.05
Tri County Regional Water Distribution District - Plainview WWTP	Plainview	0.05
Oak Grove Heights, City Of - Oak Grove Heights Wastewater Treatment Facility	Paragould	0.05
Taylor, City Of	Taylor	0.05
Tantara #1 D/b/a Boggy Bayou Sid	Pine Bluff	0.05
Mammoth Spring WWTP	Mammoth Spring	0.04
Bradford WWTP	Bradford	0.04
Bigelow, City Of	Bigelow	0.04
Lost Bridge Vill Wat-Sew Dists-Chlorine At Well #1	Garfield	0.04
Swifton, City Of	Swifton	0.04
Leslie, City Of	Leslie	0.04
Alicia, City Of	Alicia	0.04
Hickory Ridge, City Of	Hickory Ridge	0.04
Rondo, City Of-WWTF	Rondo	0.04
Wilton WW Treatment Facility	Wilton	0.04
Bauxite, Ar.Wwtf	Bauxite	0.04
Hermitage WWTP	Hermitage	0.04
Mcrae, City Of	Mcrae	0.04
Weiner, City Of	Weiner	0.04
Hatfield WWTP	Hatfield	0.04
Horatio WWTP	Horatio	0.04
Crawfordsville, City Of	Crawfordsville	0.04
Jasper WWTP	Jasper	0.03

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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 October 26, 2026.

Wastewater terms: WWTP · POTW · MGD · NPDES permit · Oxidation ditch · Anaerobic digester · all terms

Cite this page

Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.

Klarifi. “Wastewater treatment plants in Arkansas.” Updated October 26, 2026. https://klarifi.io/facilities/arkansas

Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.

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