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Harris County Mud 542

Sewage treatment plant, Tomball, Texas. NPDES permit TX0135925, in force until Apr 5, 2028. Last 12 months: over a limit 5 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (18 values)
Renewal application due
Oct 8, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
10 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025E. coli, daily maximum219 CFU/100mL≤ 200 CFU/100mL10%
December 2025Oxygen, dissolved [DO], monthly minimum3.4 mg/L≥ 4 mg/L15%
February 2026E. coli, daily maximum238 CFU/100mL≤ 200 CFU/100mL19%
March 2026E. coli, daily average139 CFU/100mL≤ 63 CFU/100mL121%
April 2026E. coli, daily average87 CFU/100mL≤ 63 CFU/100mL38%

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 suspendeddaily maximum≤ 40 mg/Lall year
Solids, total suspendeddaily average≤ 63 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 8.3 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .5 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualinstantaneous maximum≤ .1 mg/Lall year
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year
E. colidaily average≤ 63 CFU/100mLall year
E. colidaily maximum≤ 200 CFU/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 7 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 22 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 29 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/TX0135925 · MCP: https://passage-data.com/mcp