South Mission 1 WWTP
Mission, TX · Hidalgo County · Publicly Owned Treatment Works
- Average flow
- 9.49 MGD
- Design flow
- 13.5 MGD
- NPDES permit
- TX0070017
- Effective
- Permit expires
- April 2028
- Population served
- 66,255
- CWNS 2022
South Mission 1 WWTP is a publicly owned wastewater treatment works in Mission, Hidalgo County, Texas treating an average of 9.49 million gallons per day against a permitted design capacity of 13.5 MGD, serving about 66,255 residents. Treatment on site includes clarifiers, aerated lagoons, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit TX0070017 (effective), which expires in April 2028, with 0 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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Aerated lagoons
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Uncovered lagoons
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Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at South Mission 1 WWTP.
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Nearby wastewater treatment plants in Texas
Penitas · 5 mi away
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Penitas · 7 mi away
0.29 MGD
Mcallen · 10 mi away
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Pharr · 10 mi away
7.6 MGD
San Juan · 11 mi away
3.12 MGD
La Joya · 11 mi away
0.17 MGD
Alamo · 14 mi away
1.24 MGD
Sullivan City · 15 mi away
0.26 MGD
South Mission 1 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 May 28, 2025.