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CSWR-Texas Utility Operating Company LLC

Sewerage Systems, San Antonio, Texas. NPDES permit TX0090603, in force until Feb 27, 2031. Last 12 months: over a limit 5 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form B monthly (18 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], daily average6 mg/L≤ 5 mg/L20%
November 2025BOD, carbonaceous [5 day, 20 C], daily average5.33 mg/L≤ 5 mg/L7%
December 2025BOD, carbonaceous [5 day, 20 C], daily average6.67 mg/L≤ 5 mg/L33%
January 2026BOD, carbonaceous [5 day, 20 C], daily average7 mg/L≤ 5 mg/L40%
July 2026Solids, total suspended, daily average15.74 lb/d≤ 13 lb/d21%

Limits in force (22)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 5 mg/LJan, Feb, Nov, Dec
Oxygen, dissolved [DO]monthly minimum≥ 6 mg/LMar–Oct
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 5 mg/Lall year
Solids, total suspendedsingle grab sample≤ 30 mg/Lall year
Solids, total suspendeddaily average≤ 13 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 2 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily average≤ 1.6 mg/LMar–Oct
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/LMar–Oct
Nitrogen, ammonia total [as N]daily average≤ 5 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]daily average≤ 4 lb/dMar–Oct
Flow, in conduit or thru treatment plantdaily average≤ .3 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. coli, colony forming units [CFU]daily average≤ 126 CFU/100mLall year
E. coli, colony forming units [CFU]single grab sample≤ 399 CFU/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]single grab sample≤ 30 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 13 lb/dall year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0090603 · MCP: https://passage-data.com/mcp