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Sour Lake, City of

Sewage treatment plant, Sour Lake, Texas. NPDES permit TX0023876 expired Sep 28, 2026; its limits still apply. Last 12 months: over a limit 2 times (last June 2026), 2 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (17 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
April 2026Solids, total suspended, daily maximum40.8 mg/L≤ 40 mg/L2%
June 2026Flow, in conduit or thru treatment plant, daily average.6154 MGD≤ .6 MGD3%

Limits in force (22)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 10 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 25 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cdaily average≤ 50 lb/dJan, Feb, Mar, Nov, Dec
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≤ 75 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 6 mg/LApr–Oct
Nitrogen, ammonia total [as N]daily averagereport only (mg/L)Jan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily average≤ 30 lb/dApr–Oct
Nitrogen, ammonia total [as N]daily averagereport only (lb/d)Jan, Feb, Mar, Nov, Dec
Flow, in conduit or thru treatment plantdaily average≤ .6 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≤ 126 CFU/100mLall year
E. colidaily maximum≤ 399 CFU/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]daily average≤ 50 lb/dApr–Oct

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/TX0023876 · MCP: https://passage-data.com/mcp