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Mcmullen County+

Sewage treatment plant, Tilden, Texas. NPDES permit TX0132675, in force until May 14, 2031. Last 12 months: over a limit 34 times (last September 2026), 3 required values missing, 1 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (16 values), form Q quarterly
Last report on file
September 2026
Oct 2024 – Sep 2025
40 values over a limit, 34 required values missing, 7 of 16 reports late

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

All 34 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], daily average13.25 mg/L≤ 10 mg/L33%
October 2025Chlorine, total residual, monthly maximum4.27 mg/L≤ 4 mg/L7%
October 2025Chlorine, total residual, monthly minimum.2 mg/L≥ 1 mg/L80%
October 2025Nitrogen, ammonia total [as N], daily average3.93 mg/L≤ 3 mg/L31%
October 2025Solids, total suspended, daily average23.3 mg/L≤ 15 mg/L55%
November 2025BOD, carbonaceous [5 day, 20 C], daily average10.75 mg/L≤ 10 mg/L8%
November 2025Chlorine, total residual, monthly maximum4.27 mg/L≤ 4 mg/L7%
November 2025Chlorine, total residual, monthly minimum.16 mg/L≥ 1 mg/L84%
November 2025Solids, total suspended, daily average17 lb/d≤ 12 lb/d42%
November 2025Solids, total suspended, daily average50.8 mg/L≤ 15 mg/L239%
November 2025Solids, total suspended, single grab sample118 mg/L≤ 60 mg/L97%
November 2025pH, minimum4.3 SU≥ 6 SU—
December 2025BOD, carbonaceous [5 day, 20 C], daily average10.4 mg/L≤ 10 mg/L4%
December 2025Solids, total suspended, daily average29.6 mg/L≤ 15 mg/L97%
January 2026BOD, carbonaceous [5 day, 20 C], daily average13.5 mg/L≤ 10 mg/L35%
January 2026E. coli, daily average156 CFU/100mL≤ 126 CFU/100mL24%
January 2026Solids, total suspended, daily average24 mg/L≤ 15 mg/L60%
February 2026BOD, carbonaceous [5 day, 20 C], daily average16.25 mg/L≤ 10 mg/L63%
February 2026Chlorine, total residual, monthly minimum0 mg/L≥ 1 mg/L100%
February 2026Solids, total suspended, daily average219.8 mg/L≤ 15 mg/L1365%
February 2026Solids, total suspended, daily average69.3 lb/d≤ 12 lb/d478%
February 2026Solids, total suspended, single grab sample600 mg/L≤ 60 mg/L900%
March 2026Solids, total suspended, daily average33.5 mg/L≤ 15 mg/L123%
April 2026Solids, total suspended, daily average28.2 mg/L≤ 15 mg/L88%
May 2026Solids, total suspended, daily average15.04 lb/d≤ 12 lb/d25%
May 2026Solids, total suspended, daily average35.25 mg/L≤ 15 mg/L135%
June 2026Chlorine, total residual, monthly minimum.94 mg/L≥ 1 mg/L6%
June 2026Solids, total suspended, daily average12.85 lb/d≤ 12 lb/d7%
June 2026Solids, total suspended, daily average36.25 mg/L≤ 15 mg/L142%
July 2026Chlorine, total residual, monthly minimum.96 mg/L≥ 1 mg/L4%
July 2026Solids, total suspended, daily average13.31 lb/d≤ 12 lb/d11%
July 2026Solids, total suspended, daily average27.8 mg/L≤ 15 mg/L85%
July 2026Solids, total suspended, single grab sample64 mg/L≤ 60 mg/L7%
September 2026Solids, total suspended, daily average18 mg/L≤ 15 mg/L20%

Limits in force (18)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 15 mg/Lall year
Solids, total suspendedsingle grab sample≤ 60 mg/Lall year
Solids, total suspendeddaily average≤ 12 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 2.4 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .096 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year
Chlorine, total residualmonthly maximum≤ 4 mg/Lall year
E. colidaily average≤ 126 CFU/100mLall year
E. colisingle grab sample≤ 399 CFU/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]single grab sample≤ 35 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 8 lb/dall 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/TX0132675 · MCP: https://passage-data.com/mcp