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Brownsville Navigation District

Sewage treatment plant, Brownsville, Texas. NPDES permit TX0100242 expired Apr 14, 2026; its limits still apply. Last 12 months: over a limit 5 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (24 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Cyanide, free [as free], daily average.009 mg/L≤ .008 mg/L13%
October 2025Cyanide, free [as free], daily maximum.021 mg/L≤ .018 mg/L17%
April 2026Cyanide, free [as free], daily average.009 mg/L≤ .008 mg/L13%
April 2026Cyanide, free [as free], daily maximum.024 mg/L≤ .018 mg/L33%
May 2026Cyanide, free [as free], daily maximum.0182 mg/L≤ .018 mg/L1%

Limits in force (24)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cdaily average≤ 20 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 40 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 42 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 84 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 20 mg/Lall year
Solids, total suspendeddaily maximum≤ 40 mg/Lall year
Solids, total suspendeddaily average≤ 42 lb/dall year
Solids, total suspendeddaily maximum≤ 84 lb/dall year
Oil & Greasedaily average≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Oil & Greasedaily average≤ 21 lb/dall year
Oil & Greasedaily maximum≤ 31 lb/dall year
Cyanide, free [as free]daily average≤ .008 mg/Lall year
Cyanide, free [as free]daily maximum≤ .018 mg/Lall year
Cyanide, free [as free]daily average≤ .017 lb/dall year
Cyanide, free [as free]daily maximum≤ .037 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .25 MGDall year
Flow, in conduit or thru treatment plantdaily maximum≤ .5 MGDall year
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year
Chlorine, total residualmonthly maximum≤ 4 mg/Lall year
Enterococcidaily average≤ 35 CFU/100mLall year
Enterococcidaily maximum≤ 104 CFU/100mLall 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/TX0100242 · MCP: https://passage-data.com/mcp