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Zapata County

Sewage treatment plant, major discharger, Zapata, Texas. NPDES permit TX0070211 expired Aug 19, 2026; its limits still apply. Last 12 months: over a limit 13 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (30 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
20 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
February 2026Nitrogen, ammonia total [as N], daily average19.32 lb/d≤ 13 lb/d49%
February 2026Nitrogen, ammonia total [as N], daily average3.31 mg/L≤ 2 mg/L66%
March 2026BOD, carbonaceous [5 day, 20 C], daily average44.21 lb/d≤ 33 lb/d34%
March 2026BOD, carbonaceous [5 day, 20 C], daily average8.72 mg/L≤ 5 mg/L74%
April 2026BOD, carbonaceous [5 day, 20 C], daily average11.3 mg/L≤ 5 mg/L126%
April 2026BOD, carbonaceous [5 day, 20 C], daily average61.66 lb/d≤ 33 lb/d87%
April 2026BOD, carbonaceous [5 day, 20 C], daily maximum27.6 mg/L≤ 20 mg/L38%
May 2026Nitrogen, ammonia total [as N], daily average15.46 lb/d≤ 13 lb/d19%
May 2026Nitrogen, ammonia total [as N], daily average2.18 mg/L≤ 2 mg/L9%
July 2026Nitrogen, ammonia total [as N], daily average13.05 lb/d≤ 13 lb/d0%
July 2026Nitrogen, ammonia total [as N], daily average2.55 mg/L≤ 2 mg/L28%
September 2026E. coli, daily average484.6 CFU/100mL≤ 126 CFU/100mL285%
September 2026E. coli, daily maximum2419 CFU/100mL≤ 399 CFU/100mL506%

Limits in force (30)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 6 mg/Lall year
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≤ 100 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≤ 13 lb/dall year
Nitrate nitrogen, dry weightdaily average≤ 27.3 mg/Lall year
Nitrate nitrogen, dry weightdaily maximum≤ 58 mg/Lall year
Nitrate nitrogen, dry weightdaily average≤ 182 lb/dall year
Phosphorus, total [as P]daily averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily averagereport only (lb/d)all year
Sulfate, total [as SO4]daily averagereport only (mg/L)all year
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year
Sulfate, total [as SO4]daily averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantdaily average≤ .8 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
Solids, total dissolveddaily averagereport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Solids, total dissolveddaily averagereport only (lb/d)all 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≤ 33 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/TX0070211 · MCP: https://passage-data.com/mcp