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Seguin, City of

Sewage treatment plant, major discharger, Seguin, Texas. NPDES permit TX0103535, in force until Dec 30, 2030. Last 12 months: over a limit 4 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (17 values), outfall TX1 form Q quarterly (24 values), outfall TXA form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 18 reports late

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

Period endingParameterReportedLimitOver by
May 2026E. coli, colony forming units [CFU], daily maximum580 CFU/100mL≤ 399 CFU/100mL45%
June 2026E. coli, colony forming units [CFU], daily maximum400 CFU/100mL≤ 399 CFU/100mL0%
July 2026E. coli, colony forming units [CFU], daily maximum2400 CFU/100mL≤ 399 CFU/100mL502%
August 2026E. coli, colony forming units [CFU], daily maximum440 CFU/100mL≤ 399 CFU/100mL10%

Limits in force (43)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 2 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily average≤ 20 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily average≤ 355 lb/dall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendeddaily average≤ 20 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Solids, total suspendeddaily average≤ 355 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≤ 3000 gal/minall year001
Flow, in conduit or thru treatment plantannual average≤ 2.13 MGDall year001
Chlorine, total residualinstantaneous maximum< .1 mg/Lall year001
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year001
E. coli, colony forming units [CFU]daily average≤ 126 CFU/100mLall year001
E. coli, colony forming units [CFU]daily maximum≤ 399 CFU/100mLall year001
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pinephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
LOEC Lethal Survival Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
LOEC Sub-Lethal Reproduction Static Renewal 7 Day Chronic 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/TX0103535 · MCP: https://passage-data.com/mcp