Activated sludge and clarifiers: wastewater treatment plants in Alabama
59 plants · 23% of the state · 240 MGD reported by 58 plants
Klarifi identifies 59 publicly owned wastewater treatment plants with activated sludge and clarifiers in Alabama, 23% of the 257 plants in the state (240 MGD reported by 58 plants). The largest is Valley Creek Wastewater Treatment Plant in Bessemer at 37.73 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 Alabama
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Valley Creek Wastewater Treatment Plant | Bessemer | 37.73 | ALL023655 | Dec 2030 | 1 |
| 2 | Village Creek WWTP | Birmingham | 24.6 | ALL023647 | Dec 2030 | 6 |
| 3 | Clifton C. Williams Wastewater Treatment Facility | Mobile | 19.38 | AL0023086 | Jun 2025 | 60 |
| 4 | Tuscaloosa WWTP | Tuscaloosa | 18.58 | AL0022713 | Feb 2028 | 99 |
| 5 | Montgomery Enconchate WWTP | Montgomery | 12.66 | AL0022225 | May 2031 | 1 |
| 6 | City Of Huntsville | Madison | 11.76 | AL0049531 | Jun 2030 | 2 |
| 7 | Five Mile Creek Wastewater Treatment Plant | Fultondale | 11.64 | AL0026913 | Jun 2026 | 1 |
| 8 | Wright Smith Jr Wastewater Treatment Facility | Mobile | 8.31 | AL0023094 | Nov 2018 | 6 |
| 9 | Albertville Waste Water Treatment Plant | Albertville | 7.76 | AL0020192 | Apr 2027 | 21 |
| 10 | Cypress Creek WWTP | Florence | 6.86 | AL0023884 | Dec 2026 | 4 |
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 Alabama
Activated sludge and clarifiers in other states
Activated sludge and clarifiers in Alabama: 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 · Significant industrial user · WWTP · all terms