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West Harris County Mud 21

Sewage treatment plant, Houston, Texas. NPDES permit TX0109126, in force until May 16, 2030. Last 12 months: over a limit 16 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (18 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
13 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 16 values over a limit
Period endingParameterReportedLimitOver by
February 2026Solids, total suspended, daily average16.3 mg/L≤ 15 mg/L9%
February 2026Solids, total suspended, daily average32.9 lb/d≤ 31 lb/d6%
March 2026Solids, total suspended, daily average19.6 mg/L≤ 15 mg/L31%
March 2026Solids, total suspended, daily average35.2 lb/d≤ 31 lb/d14%
April 2026Solids, total suspended, daily average20.3 mg/L≤ 15 mg/L35%
April 2026Solids, total suspended, daily average40.1 lb/d≤ 31 lb/d29%
April 2026pH, minimum5.76 SU≥ 6 SU—
May 2026Chlorine, total residual, monthly maximum4.4 mg/L≤ 4 mg/L10%
May 2026Flow, in conduit or thru treatment plant, daily average.274 MGD≤ .25 MGD10%
May 2026Solids, total suspended, daily average26.3 mg/L≤ 15 mg/L75%
May 2026Solids, total suspended, daily average75 lb/d≤ 31 lb/d142%
June 2026Flow, in conduit or thru treatment plant, daily average.288 MGD≤ .25 MGD15%
June 2026Solids, total suspended, daily average37.4 lb/d≤ 31 lb/d21%
July 2026Solids, total suspended, daily average23.4 mg/L≤ 15 mg/L56%
July 2026Solids, total suspended, daily average48.2 lb/d≤ 31 lb/d55%
July 2026Solids, total suspended, single grab sample73.3 mg/L≤ 60 mg/L22%

Limits in force (21)

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≤ 31 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 3 mg/LApr–Oct
Nitrogen, ammonia total [as N]daily average≤ 5 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/LApr–Oct
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily average≤ 6.3 lb/dApr–Oct
Nitrogen, ammonia total [as N]daily average≤ 10 lb/dJan, Feb, Mar, Nov, Dec
Flow, in conduit or thru treatment plantdaily average≤ .25 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≤ 63 CFU/100mLall year
E. colisingle grab sample≤ 200 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≤ 21 lb/dall 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/TX0109126 · MCP: https://passage-data.com/mcp