Knobel WWTP
228 Clay County Road 222, Knobel, AR 72435 · Clay County · Publicly Owned Treatment Works
- Average flow
- 0.01 MGD
- Design flow
- 0.05 MGD
- NPDES permit
- AR0043290
- Effective
- Permit expires
- September 2027
- Population served
- 296
- CWNS 2022
Knobel WWTP is a publicly owned wastewater treatment works in Knobel, Clay County, Arkansas treating an average of 0.01 million gallons per day against a permitted design capacity of 0.05 MGD, serving about 296 residents. It discharges under NPDES permit AR0043290 (effective), which expires in September 2027, with 12 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Knobel WWTP.
Available with a free Klarifi account
See the full treatment train at Knobel WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 12
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Knobel WWTP.
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Knobel WWTP: frequently asked 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; facility record last updated July 24, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Anaerobic digester · Lift station · all terms