Northwest Harris Co Mud#'S 21,22,23 WWTP
Houston, TX · Harris County · Publicly Owned Treatment Works
- Average flow
- 0.98 MGD
- Design flow
- 1.5 MGD
- NPDES permit
- TX0079821
- Effective
- Permit expires
- April 2028
- Population served
- 7,177
- CWNS 2022
Northwest Harris Co Mud#'S 21,22,23 WWTP is a publicly owned wastewater treatment works in Houston, Harris County, Texas treating an average of 0.98 million gallons per day against a permitted design capacity of 1.5 MGD, serving about 7,177 residents. Treatment on site includes clarifiers. It discharges under NPDES permit TX0079821 (effective), which expires in April 2028, with 30 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
- 30
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Houston
Houston's capital improvement plan lists 22 water, sewer and wastewater line items worth $1.3B starting 2025–2025. The largest budgeted items are shown here.
All water and sewer capital projects in Houston →
| Project | Budget | Years |
|---|---|---|
| Wastewater Treatment Plant Improvements | $353,943,200 | 2025–2025 |
| Wastewater Treatment Plant Consolidation | $166,807,000 | 2025–2025 |
| Surface Water Transmission Program | $132,740,144 | 2025–2025 |
| Neighborhood Sewer Rehab Program | $96,000,000 | 2025–2025 |
| Pump Station Program | $87,851,600 | 2025–2025 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
5 verified contacts for Northwest Harris Co Mud#'S 21,22,23 WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Northwest Harris Co Mud#'S 21,22,23 WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Texas
Houston · 1 mi away
0.46 MGD
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1.97 MGD
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0.39 MGD
Houston · 1 mi away
1 MGD
Houston · 2 mi away
0.19 MGD
Houston · 2 mi away
0.47 MGD
Houston · 2 mi away
1.21 MGD
Houston · 2 mi away
0.27 MGD
Northwest Harris Co Mud#'S 21,22,23 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 July 3, 2025.