Harris County Mud 531 WWTP
Cypress, TX · Harris County · Publicly Owned Treatment Works
- Average flow
- 0.21 MGD
- Design flow
- 0.24 MGD
- NPDES permit
- TX0135119
- Effective
- Permit expires
- February 2028
- Population served
- —
- CWNS 2022
Harris County Mud 531 WWTP is a publicly owned wastewater treatment works in Cypress, Harris County, Texas treating an average of 0.21 million gallons per day against a permitted design capacity of 0.24 MGD. Treatment on site includes clarifiers. It discharges under NPDES permit TX0135119 (effective), which expires in February 2028, with 1 recorded violation 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
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Harris County Mud 531 WWTP.
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Nearby wastewater treatment plants in Texas
Houston · 2 mi away
0.73 MGD
Tomball · 3 mi away
0.14 MGD
Houston · 3 mi away
1.16 MGD
Cypress · 4 mi away
0.32 MGD
Cypress · 4 mi away
0.05 MGD
Hockley · 4 mi away
0.18 MGD
Houston · 4 mi away
0.23 MGD
Cypress · 4 mi away
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Harris County Mud 531 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 September 11, 2026; facility record last updated January 29, 2025.