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Merkel, City of

Sewage treatment plant, Merkel, Texas. NPDES permit TX0111341, in force until Oct 18, 2029. Last 12 months: over a limit 29 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

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

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

All 29 values over a limit
Period endingParameterReportedLimitOver by
October 2025Oxygen, dissolved [DO], monthly minimum3.7 mg/L≥ 4 mg/L8%
October 2025Solids, total suspended, daily average139.2 mg/L≤ 90 mg/L55%
November 2025BOD, 5-day, 20 deg. C, daily average39.75 mg/L≤ 30 mg/L33%
November 2025Oxygen, dissolved [DO], monthly minimum.9 mg/L≥ 4 mg/L78%
November 2025Solids, total suspended, daily average91 mg/L≤ 90 mg/L1%
December 2025BOD, 5-day, 20 deg. C, daily average37.66 mg/L≤ 30 mg/L26%
December 2025Oxygen, dissolved [DO], monthly minimum3 mg/L≥ 4 mg/L25%
January 2026BOD, 5-day, 20 deg. C, daily average35.75 mg/L≤ 30 mg/L19%
January 2026BOD, 5-day, 20 deg. C, single grab sample102.5 mg/L≤ 100 mg/L3%
January 2026Solids, total suspended, daily average92.13 mg/L≤ 90 mg/L2%
February 2026Oxygen, dissolved [DO], monthly minimum1.1 mg/L≥ 4 mg/L73%
March 2026BOD, 5-day, 20 deg. C, daily average39.95 mg/L≤ 30 mg/L33%
March 2026Oxygen, dissolved [DO], monthly minimum.1 mg/L≥ 4 mg/L98%
April 2026BOD, 5-day, 20 deg. C, daily average74.28 mg/L≤ 30 mg/L148%
April 2026BOD, 5-day, 20 deg. C, single grab sample139.6 mg/L≤ 100 mg/L40%
April 2026E. coli, daily average149.37 CFU/100mL≤ 126 CFU/100mL19%
April 2026E. coli, single grab sample1553.1 CFU/100mL≤ 399 CFU/100mL289%
April 2026Oxygen, dissolved [DO], monthly minimum.1 mg/L≥ 4 mg/L98%
April 2026Solids, total suspended, daily average95.56 mg/L≤ 90 mg/L6%
May 2026Oxygen, dissolved [DO], monthly minimum.01 mg/L≥ 4 mg/L100%
May 2026Solids, total suspended, daily average90.75 mg/L≤ 90 mg/L1%
June 2026BOD, 5-day, 20 deg. C, daily average33.75 mg/L≤ 30 mg/L13%
June 2026Oxygen, dissolved [DO], monthly minimum.4 mg/L≥ 4 mg/L90%
June 2026Solids, total suspended, daily average108.33 mg/L≤ 90 mg/L20%
July 2026BOD, 5-day, 20 deg. C, daily average35.68 mg/L≤ 30 mg/L19%
July 2026Oxygen, dissolved [DO], monthly minimum1.8 mg/L≥ 4 mg/L55%
August 2026Oxygen, dissolved [DO], monthly minimum2 mg/L≥ 4 mg/L50%
September 2026Oxygen, dissolved [DO], monthly minimum2 mg/L≥ 4 mg/L50%
September 2026Solids, total suspended, daily average176.5 mg/L≤ 90 mg/L96%

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≤ 80 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 90 mg/Lall year
Solids, total suspendeddaily average≤ 240 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .32 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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0111341 · MCP: https://passage-data.com/mcp