Dequincy Wastewater Treatment Facility
End Of William Still St, Dequincy, LA 70633 · Calcasieu County · Publicly Owned Treatment Works
- Average flow
- 0.1 MGD
- Design flow
- —
- NPDES permit
- LAL038709
- Effective
- Permit expires
- December 2030
- Population served
- 3,830
- CWNS 2022
Dequincy Wastewater Treatment Facility is a publicly owned wastewater treatment works in Dequincy, Calcasieu County, Louisiana treating an average of 0.1 million gallons per day, serving about 3,830 residents. It discharges under NPDES permit LAL038709 (effective), which expires in December 2030, with 55 recorded violations in the last three years. EPA has recorded 5 formal enforcement actions naming the plant, the latest in April 2017.
Treatment technology
Treatment structures and unit processes at Dequincy Wastewater Treatment Facility.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 55
- Effluent violations
- 17
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Dequincy Wastewater Treatment Facility in EPA's ICIS system.
- Formal actions
- 5
- 0 since FY2020
- Compliance actions
- $300
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Apr 2017
DeQuincy, City of
Administrative order · CWA, Sewage Sludge Disposal · Unilateral Administrative Order Without Adjudication · Compliance actions $200
EPA's description of the case:
“VIOLATIONS: AO issued for failure to submit annual sludge discharge monitoring reports for calendar year 2014. Relief Sought: Submit annual sludge discharge monitoring reports for calendar year 2014.”
Source: EPA ECHO, civil enforcement case 06-2015-1807.
Full case history with a free Klarifi account
Every action against Dequincy Wastewater Treatment Facility with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at Dequincy Wastewater Treatment Facility.
No verified contacts on file yet
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Nearby wastewater treatment plants in Louisiana
Vinton · 19 mi away
0.6 MGD
Lake Charles · 19 mi away
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Lake Charles · 21 mi away
0.05 MGD
Merryville · 23 mi away
0.17 MGD
Iowa · 27 mi away
0.38 MGD
Deridder · 30 mi away
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Rosepine · 34 mi away
0.17 MGD
Kinder · 35 mi away
0.32 MGD
Dequincy Wastewater Treatment Facility: 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 18, 2023.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms