Lagoon systems: wastewater treatment plants in Arkansas
238 plants · 74% of the state · 72 MGD reported by 127 plants
Klarifi identifies 238 publicly owned wastewater treatment plants with lagoon systems in Arkansas, 74% of the 321 plants in the state (72 MGD reported by 127 plants). The largest is Pine Bluff WW Utility-Boyd Pt in Pine Bluff at 7.62 MGD.
Lagoon systems treat wastewater in large earthen ponds over weeks of retention time, with or without mechanical aeration. They serve thousands of small towns because they are cheap to run, but they struggle with ammonia and nutrient limits, fill with sludge over decades and are the plants most often converted or upgraded when a permit is renewed.
The largest lagoons in Arkansas
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Pine Bluff WW Utility-Boyd Pt | Pine Bluff | 7.62 | ARL033316 | Dec 2030 | 16 |
| 2 | Fayetteville - Noland WWTP | Fayetteville | 6.81 | AR0020010 | Apr 2029 | 6 |
| 3 | Lrwra-Fourche Creek Water Reclamation Facility | Little Rock | 6.57 | AR0040177 | Jul 2025 | 0 |
| 4 | Russellville WWTP | Russellville | 4.2 | ARL021768 | Dec 2030 | 46 |
| 5 | Searcy Wastewater Treatment Plant | Searcy | 3.24 | AR0021601 | Apr 2024 | 12 |
| 6 | Jacksonville Wastewater Utility | Jacksonville | 3 | AR0041335 | Jan 2029 | 0 |
| 7 | Tucker Creek Wastewater Treatment Plant | Conway | 2.96 | ARL047279 | Dec 2030 | 11 |
| 8 | Green Forest, City Of - Green Forest WWTP | Green Forest | 2.51 | AR0021741 | Mar 2027 | 0 |
| 9 | Nlrwu-White Oak Bayou | North Little Rock | 2.45 | AR0038288 | Jul 2028 | 0 |
| 10 | Dequeen, City Of | De Queen | 2.29 | AR0021733 | Mar 2025 | 57 |
| 11 | Cwl-West Side Wastewater Treatment Plant | Jonesboro | 1.91 | AR0037907 | Mar 2028 | 3 |
| 12 | Huntsville WWTF | Huntsville | 1.65 | ARL022004 | Dec 2030 | 20 |
| 13 | Nlr Wastewater Utility - Maumelle Water Management | Maumelle | 1.64 | ARL033626 | Dec 2030 | 0 |
| 14 | Mena Wastewater Treatment Facility | Mena | 1.4 | AR0036692 | Nov 2027 | 16 |
| 15 | Marion, City Of | Marion | 1.33 | AR0021971 | Dec 2028 | 95 |
| 16 | Berryville, City Of-WWTP | Berryville | 1.32 | AR0021792 | Oct 2021 | 2 |
| 17 | Newport, City Of | Newport | 1.31 | AR0037044 | Sep 2027 | 9 |
| 18 | Clarksville Connected Utilities - Pollution Control Facility | Clarksville | 1.1 | ARL022187 | Dec 2030 | 2 |
| 19 | Eudora, City Of | Eudora | 0.81 | AR0033839 | Mar 2026 | 47 |
| 20 | Blytheville Sewer Dept.-South WWTP | Blytheville | 0.77 | AR0022578 | Jun 2024 | 34 |
| 21 | Greenwood, City Of | Greenwood | 0.74 | AR0022454 | Jun 2028 | 8 |
| 22 | Paris WWTP | Paris | 0.73 | AR0021857 | May 2026 | 30 |
| 23 | Gentry WWTP | Gentry | 0.72 | AR0020184 | Sep 2023 | 58 |
| 24 | Oak Grove Heights, City Of - Oak Grove Heights Wastewater Treatment Facility | Paragould | 0.6 | AR0045837 | Oct 2027 | 4 |
| 25 | City Of Sherwood-North Facility | Sherwood | 0.59 | AR0037176 | Feb 2030 | 19 |
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
Lagoon systems in other states
Lagoon systems 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.