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Mertens, City of

Sewage treatment plant, Mertens, Texas. NPDES permit TX0133761, in force until Mar 27, 2029. Last 12 months: over a limit 4 times (last February 2026), 1 of 10 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (12 values)
Last report on file
July 2026
Oct 2024 – Sep 2025
0 values over a limit, 96 required values missing, 12 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
November 2025BOD, 5-day, 20 deg. C, daily average31 mg/L≤ 30 mg/L3%
February 2026BOD, 5-day, 20 deg. C, daily average42 mg/L≤ 30 mg/L40%
February 2026E. coli, daily average175.03 CFU/100mL≤ 126 CFU/100mL39%
February 2026pH, maximum9.4 SU≤ 9 SU—

Limits in force (12)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Csingle grab sample≤ 100 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 6.3 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 90 mg/Lall year
Solids, total suspendeddaily average≤ 19 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .025 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
E. colidaily average≤ 126 CFU/100mLall year
E. colisingle grab sample≤ 399 CFU/100mLall year

How strict are these limits?

Cited limits by parameter: Texas's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0133761 · MCP: https://passage-data.com/mcp