Williamsburg Regional
Katy, TX · Harris County · Publicly Owned Treatment Works
- Average flow
- 2.77 MGD
- Design flow
- 3 MGD
- NPDES permit
- TX0058408
- Effective
- Permit expires
- August 2027
- Population served
- 5,903
- CWNS 2022
Williamsburg Regional is a publicly owned wastewater treatment plant in Katy, Harris County, Texas treating an average of 2.77 million gallons per day against a permitted design capacity of 3 MGD, serving about 5,903 residents. Treatment on site includes clarifiers. It discharges under NPDES permit TX0058408 (effective), which expires in August 2027, with 52 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 52
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Williamsburg Regional, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Williamsburg Regional, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Texas
Katy · 2 mi away
1.36 MGD
Houston · 2 mi away
0.3 MGD
Houston · 2 mi away
0.72 MGD
Katy · 2 mi away
3 MGD
Katy · 2 mi away
0.55 MGD
Houston · 2 mi away
0.57 MGD
Katy · 2 mi away
0.94 MGD
Katy · 3 mi away
0.22 MGD
Williamsburg Regional: 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 September 11, 2026; facility record last updated March 11, 2025.