Activated sludge and clarifiers: wastewater treatment plants in Arkansas
49 plants · 15% of the state · 97 MGD reported by 46 plants
Klarifi identifies 49 publicly owned wastewater treatment plants with activated sludge and clarifiers in Arkansas, 15% of the 324 plants in the state (97 MGD reported by 46 plants). The largest is Fayetteville/ West Side WWTP in Fayetteville at 10.18 MGD.
Activated sludge is the standard mechanical process for cities: aeration basins where bacteria consume organic matter, followed by clarifiers that settle the biomass out. These plants are identified by their circular or rectangular clarifiers and by the suspended-growth process code, and they are the main market for blowers, diffusers, clarifier mechanisms and instrumentation.
The largest activated sludge plants in Arkansas
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Fayetteville/ West Side WWTP | Fayetteville | 10.18 | ARL050288 | Dec 2030 | 0 |
| 2 | Fort Smith, City Of - P Street Water Reclamation Facility | Fort Smith | 9.55 | ARL033278 | Dec 2030 | 4 |
| 3 | City Of Hot Springs Regional Wastewater Treatment Plant | Hot Springs | 9.53 | AR0033880 | Jun 2029 | 87 |
| 4 | Fort Smith, City Of-Massard Water Reclamation Facility | Barling | 8.03 | AR0021750 | Feb 2026 | 40 |
| 5 | Lrwra-Fourche Creek Water Reclamation Facility | Little Rock | 7.26 | AR0040177 | Jul 2025 | 0 |
| 6 | Fayetteville - Noland WWTP | Fayetteville | 6.32 | AR0020010 | Apr 2029 | 6 |
| 7 | Benton WWTP | Benton | 4.49 | AR0036498 | Mar 2026 | 4 |
| 8 | Northwest Arkansas Conservation Authority -Regional WWTP | Bentonville | 3.99 | AR0050024 | Dec 2026 | 160 |
| 9 | Jacksonville Wastewater Utility | Jacksonville | 3.97 | AR0041335 | Jan 2029 | 0 |
| 10 | Russellville WWTP | Russellville | 3.97 | ARL021768 | Dec 2030 | 46 |
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.
Other technologies in Arkansas
Activated sludge and clarifiers in other states
Activated sludge and clarifiers 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: Activated sludge · Biological nutrient removal · Equalization tank · Centrate · Ozonation · all terms