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Northwest Harris County Mud 10

Sewage treatment plant, major discharger, Cypress, Texas. NPDES permit TX0075159, in force until Sep 21, 2028. Last 12 months: over a limit 12 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (21 values)
Renewal application due
Mar 25, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
8 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
November 2025Solids, total suspended, daily average< 15.2 mg/L≤ 15 mg/L1%
November 2025Solids, total suspended, daily maximum64.8 mg/L≤ 40 mg/L62%
December 2025Solids, total suspended, daily maximum51.2 mg/L≤ 40 mg/L28%
March 2026Solids, total suspended, daily maximum56.5 mg/L≤ 40 mg/L41%
May 2026E. coli, daily average69.4 CFU/100mL≤ 63 CFU/100mL10%
May 2026E. coli, daily maximum2420 CFU/100mL≤ 200 CFU/100mL1110%
May 2026Nitrogen, ammonia total [as N], daily average< 18.8 lb/d≤ 17 lb/d11%
May 2026Nitrogen, ammonia total [as N], daily average< 3.98 mg/L≤ 2 mg/L99%
May 2026Nitrogen, ammonia total [as N], daily maximum15.6 mg/L≤ 10 mg/L56%
June 2026BOD, carbonaceous [5 day, 20 C], daily average10.4 mg/L≤ 7 mg/L49%
July 2026BOD, carbonaceous [5 day, 20 C], daily average8.3 mg/L≤ 7 mg/L19%
August 2026BOD, carbonaceous [5 day, 20 C], daily average8.78 mg/L≤ 7 mg/L25%

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≤ 124 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≤ 17 lb/dall year
Nitrate nitrogen, dry weightdaily average≤ 23.5 mg/Lall year
Nitrate nitrogen, dry weightdaily maximum≤ 49.7 mg/Lall year
Nitrate nitrogen, dry weightdaily average≤ 195 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .995 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. 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≤ 17 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 58 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/TX0075159 · MCP: https://passage-data.com/mcp