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Castroville, City of

Sewage treatment plant, Castroville, Texas. NPDES permit TX0129364, in force until Feb 6, 2031. Last 12 months: over a limit 2 times (last January 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (21 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
14 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
December 2025BOD, carbonaceous [5 day, 20 C], daily average6.6 mg/L≤ 5 mg/L32%
January 2026BOD, carbonaceous [5 day, 20 C], daily average7.25 mg/L≤ 5 mg/L45%

Limits in force (21)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 5 mg/Lall year
Solids, total suspendeddaily maximum≤ 20 mg/Lall year
Solids, total suspendeddaily average≤ 29 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≤ 12 lb/dall year
Phosphorus, total [as P]daily average≤ 1 mg/Lall year
Phosphorus, total [as P]daily maximum≤ 4 mg/Lall year
Phosphorus, total [as P]daily average≤ 5.8 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .7 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≤ 5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 29 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/TX0129364 · MCP: https://passage-data.com/mcp