370 Rosalie Maria Dr, Biloxi, MS 39531 · Harrison County · Publicly Owned Treatment Works
West Biloxi Wastewater Treatment Plant is a publicly owned wastewater treatment works in Biloxi, Harrison County, Mississippi treating an average of 5.57 million gallons per day against a permitted design capacity of 11.7 MGD. It discharges under NPDES permit MS0030333 (effective), which expires in June 2028, with 1 recorded violation in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in January 2007.
2 treatment structures and unit processes identified at West Biloxi Wastewater Treatment Plant.
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See the full treatment train at West Biloxi Wastewater Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Federal civil enforcement cases, compliance inspections and informal actions recorded for West Biloxi Wastewater Treatment Plant in EPA's ICIS system.
Latest case · Jan 2007
BILOXI, MS, CITY OF (EAST BILOXI (KEEGAN BAYOU) WWTP / WEST BILOXI WWTP)
Administrative order · CWA, NPDES Discharge without a Permit · Unilateral Administrative Order Without Adjudication · Compliance actions $700,000 · The case also names 1 other plant, and its amounts cover all of them
Source: EPA ECHO, civil enforcement case 04-2004-4814.
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Every action against West Biloxi Wastewater Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Decision-makers at West Biloxi Wastewater Treatment Plant.
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2.95 MGD
Gulfport · 12 mi away
0.09 MGD
Gulfport · 12 mi away
0.27 MGD
Long Beach · 14 mi away
0.22 MGD
Mchenry · 21 mi away
0.08 MGD
Pascagoula · 24 mi away
5.09 MGD
Diamondhead · 25 mi away
0.98 MGD
Moss Point · 26 mi away
1 MGD
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 May 20, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Sludge dewatering · Biological nutrient removal · all terms