Main WWTP
5200 Port Industrial Rd, Galveston, TX 77551 · Galveston County · Publicly Owned Treatment Works
- Average flow
- 4.11 MGD
- Design flow
- 3.5 MGD
- NPDES permit
- TX0095583
- Effective
- Permit expires
- January 2031
- Population served
- 17,000
- CWNS 2022
Main WWTP is a publicly owned wastewater treatment works in Galveston, Galveston County, Texas treating an average of 4.11 million gallons per day against a permitted design capacity of 3.5 MGD, serving about 17,000 residents. It discharges under NPDES permit TX0095583 (effective), which expires in January 2031, with 15 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Main WWTP.
Available with a free Klarifi account
See the full treatment train at Main WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 15
- Effluent violations
- 15
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Main WWTP.
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Nearby wastewater treatment plants in Texas
Galveston · 1 mi away
7.29 MGD
Galveston · 2 mi away
5.41 MGD
Texas City · 6 mi away
8.07 MGD
Galveston · 6 mi away
0.28 MGD
Bayou Vista · 7 mi away
0.43 MGD
Texas City · 9 mi away
14.65 MGD
Galveston · 9 mi away
1.17 MGD
La Marque · 10 mi away
5.07 MGD
Main 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 May 26, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms