City Of Mercedes WWTP
S Intx Mile 1/2 E Rd & N 8 Mil, Mercedes, TX 78570 · Hidalgo County · Publicly Owned Treatment Works
- Average flow
- 2.21 MGD
- Design flow
- 5 MGD
- NPDES permit
- TX0021547
- Effective
- Permit expires
- February 2027
- Population served
- 16,648
- CWNS 2022
City Of Mercedes WWTP is a publicly owned wastewater treatment works in Mercedes, Hidalgo County, Texas treating an average of 2.21 million gallons per day against a permitted design capacity of 5 MGD, serving about 16,648 residents. It discharges under NPDES permit TX0021547 (effective), which expires in February 2027, with 2 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in May 2021.
Treatment technology
2 treatment structures and unit processes identified at City Of Mercedes WWTP.
Available with a free Klarifi account
See the full treatment train at City Of Mercedes WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for City Of Mercedes WWTP in EPA's ICIS system.
- Formal actions
- 1
- 1 since FY2020
- Compliance actions
- $5,000
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · May 2021
City of Mercedes
Administrative order · CWA, NPDES Permit Violations · Unilateral Administrative Order Without Adjudication · Compliance actions $5,000
EPA's description of the case:
“The City of Mercedes was issued the order for effluent violations on the permit limits. The order requires a corrective action plan.”
Source: EPA ECHO, civil enforcement case 06-2020-1733.
Full case history with a free Klarifi account
Every action against City Of Mercedes WWTP with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
Decision-makers at City Of Mercedes WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Texas
La Feria · 5 mi away
0.8 MGD
Weslaco · 5 mi away
3.57 MGD
Weslaco · 8 mi away
1.61 MGD
Santa Rosa · 8 mi away
0.27 MGD
La Villa · 9 mi away
0.12 MGD
Donna · 9 mi away
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Edcouch · 9 mi away
0.1 MGD
Elsa · 11 mi away
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City Of Mercedes 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 29, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms