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Si Enterprises LLC

Sewerage Systems, Houston, Texas. NPDES permit TX0134872, in force until Feb 15, 2029. Last 12 months: over a limit 21 times (last August 2026). 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
August 2026
Oct 2024 – Sep 2025
12 values over a limit, 0 required values missing, 0 of 16 reports late

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

All 21 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], daily average.432 lb/d≤ .17 lb/d154%
October 2025Nitrogen, ammonia total [as N], daily average.114 lb/d≤ .05 lb/d128%
October 2025Solids, total suspended, daily average1.5566 lb/d≤ .25 lb/d523%
November 2025BOD, carbonaceous [5 day, 20 C], daily average.3845 lb/d≤ .17 lb/d126%
November 2025Enterococci, daily average> 2419.6 CFU/100mL≤ 35 CFU/100mL—
November 2025Enterococci, single grab sample> 2419.6 CFU/100mL≤ 104 CFU/100mL—
November 2025Solids, total suspended, daily average1.039 lb/d≤ .25 lb/d316%
December 2025BOD, carbonaceous [5 day, 20 C], daily average.748 lb/d≤ .17 lb/d340%
December 2025Nitrogen, ammonia total [as N], daily average.061 lb/d≤ .05 lb/d22%
December 2025Solids, total suspended, daily average1.276 lb/d≤ .25 lb/d410%
January 2026BOD, carbonaceous [5 day, 20 C], daily average.934 lb/d≤ .17 lb/d449%
January 2026Solids, total suspended, daily average1.943 lb/d≤ .25 lb/d677%
February 2026BOD, carbonaceous [5 day, 20 C], daily average.593 lb/d≤ .17 lb/d249%
February 2026Enterococci, daily average2419.6 CFU/100mL≤ 35 CFU/100mL6813%
February 2026Enterococci, single grab sample2419.6 CFU/100mL≤ 104 CFU/100mL2227%
February 2026Flow, in conduit or thru treatment plant, daily average.00228 MGD≤ .002 MGD14%
February 2026Nitrogen, ammonia total [as N], daily average.11 lb/d≤ .05 lb/d120%
February 2026Solids, total suspended, daily average1.641 lb/d≤ .25 lb/d556%
June 2026Solids, total suspended, daily average20.9 mg/L≤ 15 mg/L39%
June 2026Solids, total suspended, single grab sample200 mg/L≤ 60 mg/L233%
August 2026pH, minimum5.97 SU≥ 6 SU—

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≤ .25 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≤ .05 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .002 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
Enterococcidaily average≤ 35 CFU/100mLall year
Enterococcisingle grab sample≤ 104 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≤ .17 lb/dall year

How strict are these limits?

Cited limits by parameter: Texas's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/TX0134872 · MCP: https://passage-data.com/mcp