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Robstown, City of

Sewage treatment plant, major discharger, Robstown, Texas. NPDES permit TX0020389 expired Dec 10, 2025; its limits still apply. Last 12 months: over a limit 9 times (last August 2026), 26 required values missing, 5 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (23 values), outfall TX1 form Q quarterly, outfall TXA form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 24 required values missing, 4 of 18 reports late

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

Period endingParameterReportedLimitOver by
November 2025BOD, carbonaceous [5 day, 20 C], daily maximum29 mg/L≤ 25 mg/L16%
December 2025BOD, carbonaceous [5 day, 20 C], daily maximum38.9 mg/L≤ 25 mg/L56%
January 2026Cyanide, free [amenable to chlorination], daily maximum.17 mg/L≤ .082 mg/L107%
May 2026BOD, carbonaceous [5 day, 20 C], daily average16.55 mg/L≤ 10 mg/L66%
May 2026BOD, carbonaceous [5 day, 20 C], daily maximum42.2 mg/L≤ 25 mg/L69%
May 2026Nitrogen, ammonia total [as N], daily average6.285 mg/L≤ 3 mg/L110%
May 2026Nitrogen, ammonia total [as N], daily maximum16 mg/L≤ 10 mg/L60%
July 2026Cyanide, free [amenable to chlorination], daily maximum2.4 mg/L≤ .082 mg/L2827%
August 2026Nitrogen, ammonia total [as N], daily average3.634 mg/L≤ 3 mg/L21%

Limits in force (37)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendeddaily average≤ 15 mg/Lall year001
Solids, total suspendeddaily maximum≤ 40 mg/Lall year001
Solids, total suspendeddaily average≤ 300 lb/dall year001
Nitrogen, ammonia total [as N]daily average≤ 3 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/Lall year001
Nitrogen, ammonia total [as N]daily average≤ 60 lb/dall year001
Cyanide, free [amenable to chlorination]daily average≤ .038 mg/Lall year001
Cyanide, free [amenable to chlorination]daily maximum≤ .082 mg/Lall year001
Cyanide, free [amenable to chlorination]daily average≤ .76 lb/dall year001
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Flow, in conduit or thru treatment plant2-hour peak≤ 5000 gal/minall year001
Flow, in conduit or thru treatment plantannual average≤ 2.4 MGDall year001
Chlorine, total residualinstantaneous maximum< .1 mg/Lall year001
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year001
E. colidaily average≤ 126 CFU/100mLall year001
E. colidaily maximum≤ 380 CFU/100mLall year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 200 lb/dall year001
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulexmonthly average minimumreport only (pass=0;fail=1)all yearTX1
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all yearTX1
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48-hour minimumreport only (%)all yearTX1
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulexmonthly average minimumreport only (%)all yearTX1
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48-hour minimumreport only (%)all yearTX1
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulex48-hour minimumreport only (%)all yearTX1
LOAEC Lethal Static Renewal 48HR Acute Daphnia pulexmonthly average minimumreport only (%)all yearTX1
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (%)all yearTX1
LOAEC Lethal Survival Static Renewal 48Hr Acute Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXA
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXA

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/TX0020389 · MCP: https://passage-data.com/mcp