Activated sludge and clarifiers: wastewater treatment plants in Alabama
58 plants · 23% of the state · 167 MGD reported by 56 plants
Klarifi identifies 58 publicly owned wastewater treatment plants with activated sludge and clarifiers in Alabama, 23% of the 253 plants in the state (167 MGD reported by 56 plants). The largest is Valley Creek Wastewater Treatment Plant in Bessemer at 29.2 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 | 29.2 | ALL023655 | Dec 2030 | 1 |
| 2 | Tuscaloosa WWTP | Tuscaloosa | 17.05 | AL0022713 | Feb 2028 | 94 |
| 3 | Village Creek WWTP | Birmingham | 13.4 | ALL023647 | Dec 2030 | 6 |
| 4 | Montgomery Enconchate WWTP | Montgomery | 12.7 | AL0022225 | May 2031 | 1 |
| 5 | City Of Huntsville | Madison | 10.29 | AL0049531 | Jun 2030 | 2 |
| 6 | Wright Smith Jr Wastewater Treatment Facility | Mobile | 7.48 | AL0023094 | Nov 2018 | 6 |
| 7 | Albertville Waste Water Treatment Plant | Albertville | 6.44 | AL0020192 | Apr 2027 | 24 |
| 8 | Five Mile Creek Wastewater Treatment Plant | Fultondale | 6.1 | AL0026913 | Jun 2026 | 1 |
| 9 | Cypress Creek WWTP | Florence | 5.14 | AL0023884 | Dec 2026 | 4 |
| 10 | Gadsden West River WWTP | Gadsden | 4.15 | AL0053201 | Jul 2030 | 40 |
| 11 | Aldridge Creek Wastewater Treatment Plant | Huntsville | 4.06 | AL0056855 | Feb 2027 | 0 |
| 12 | Phenix City Wastewater Treatment Plant | Phenix City | 3.25 | AL0022209 | Jul 2026 | 254 |
| 13 | Walnut Creek WWTP | Troy | 3.06 | AL0032310 | Nov 2029 | 20 |
| 14 | Alabaster WWTP | Alabaster | 2.95 | AL0025828 | Nov 2029 | 1 |
| 15 | Eastlake Wastewater Plant | Guntersville | 2.78 | AL0020150 | Aug 2027 | 12 |
| 16 | Opelika Westside WWTP | Opelika | 2.75 | AL0050130 | Mar 2028 | 6 |
| 17 | Turkey Creek WWTP | Pinson | 2.7 | AL0022926 | Jun 2026 | 1 |
| 18 | Jasper Town Creek WWTP | Jasper | 2.6 | AL0023418 | Sep 2029 | 2 |
| 19 | Trussvillle WWTP | Trussville | 2 | ALL022934 | Dec 2030 | 3 |
| 20 | Northport Wastewater Treatment Plant | N Port | 1.98 | AL0064394 | Nov 2025 | 27 |
| 21 | Russellville WWTP | Russellville | 1.84 | AL0027987 | Jul 2027 | 5 |
| 22 | Big Cove WWTP | Brownsboro | 1.57 | AL0055042 | May 2028 | 1 |
| 23 | Lanett WWTP City Of | Lanett | 1.57 | AL0023159 | Nov 2025 | 24 |
| 24 | J. E. Ham WWTP | Sylacauga | 1.57 | AL0020001 | Jun 2030 | 0 |
| 25 | Utilities Board Of The City Of Tuskegee | Tuskegee | 1.4 | AL0048763 | Apr 2031 | 33 |
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 September 11, 2026.