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Northwest Harris County Mud 16

Sewage treatment plant, Houston, Texas. NPDES permit TX0075981, in force until Nov 14, 2027. Last 12 months: over a limit 4 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (18 values)
Renewal application due
May 18, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 3 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], daily maximum11.4 mg/L≤ 10 mg/L14%
July 2026Nitrogen, ammonia total [as N], daily average19.33 lb/d≤ 11 lb/d76%
July 2026Nitrogen, ammonia total [as N], daily average4.102 mg/L≤ 2 mg/L105%
July 2026Nitrogen, ammonia total [as N], daily maximum17.7 mg/L≤ 10 mg/L77%

Limits in force (21)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 6 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≤ 83 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 2 mg/LApr–Oct
Nitrogen, ammonia total [as N]daily average≤ 3 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LApr–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily average≤ 11 lb/dApr–Oct
Nitrogen, ammonia total [as N]daily average≤ 17 lb/dJan, Feb, Mar, Nov, Dec
Flow, in conduit or thru treatment plantdaily average≤ .66 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 MPN/100mLall year
E. colidaily maximum≤ 200 MPN/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 55 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/TX0075981 · MCP: https://passage-data.com/mcp