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Trinity River Authority of Texas

Sewage treatment plant, major discharger, Midlothian, Texas. NPDES permit TX0025011, in force until Jan 23, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (18 values), outfall 002 form A monthly (18 values), outfall SUM form A monthly (4 values), outfall TX2 form S twice a year, outfall TX2 form Y yearly, outfall TXB form S twice a year
Renewal application due
Jul 27, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 40 reports late

Limits in force (72)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 6 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≤ 113 lb/dall year001
Nitrogen, ammonia total [as N]daily average≤ 2 mg/LMar–Sep001
Nitrogen, ammonia total [as N]daily average≤ 4 mg/LJan, Feb, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LMar–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 12 mg/LJan, Feb, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily average≤ 15 lb/dMar–Sep001
Nitrogen, ammonia total [as N]daily average≤ 30 lb/dJan, Feb, Oct, Nov, Dec001
Flow, in conduit or thru treatment plantdaily average≤ .9 MGDall year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year001
Chlorine, total residualmonthly maximum≤ 4 mg/Lall year001
E. colidaily average≤ 126 CFU/100mLall year001
E. colidaily maximum≤ 399 CFU/100mLall year001
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/LJan, Feb, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily average≤ 7 mg/LMar–Sep001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LJan, Feb, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 22 mg/LMar–Sep001
BOD, carbonaceous [5 day, 20 C]daily average≤ 75 lb/dJan, Feb, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily average≤ 53 lb/dMar–Sep001
Oxygen, dissolved [DO]monthly minimum≥ 6 mg/Lall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendeddaily average≤ 15 mg/Lall year002
Solids, total suspendeddaily maximum≤ 40 mg/Lall year002
Solids, total suspendeddaily average≤ 563 lb/dall year002
Nitrogen, ammonia total [as N]daily average≤ 2 mg/LMar–Sep002
Nitrogen, ammonia total [as N]daily average≤ 4 mg/LJan, Feb, Oct, Nov, Dec002
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LMar–Sep002
Nitrogen, ammonia total [as N]daily maximum≤ 12 mg/LJan, Feb, Oct, Nov, Dec002
Nitrogen, ammonia total [as N]daily average≤ 75 lb/dMar–Sep002
Nitrogen, ammonia total [as N]daily average≤ 150 lb/dJan, Feb, Oct, Nov, Dec002
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Flow, in conduit or thru treatment plant2-hour peak≤ 6250 gal/minall year002
Flow, in conduit or thru treatment plantannual average≤ 4.5 MGDall year002
E. colidaily average≤ 126 CFU/100mLall year002
E. colidaily maximum≤ 399 CFU/100mLall year002
BOD, carbonaceous [5 day, 20 C]daily average≤ 7 mg/LMar–Sep002
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/LJan, Feb, Oct, Nov, Dec002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LMar–Sep002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LJan, Feb, Oct, Nov, Dec002
BOD, carbonaceous [5 day, 20 C]daily average≤ 263 lb/dMar–Sep002
BOD, carbonaceous [5 day, 20 C]daily average≤ 375 lb/dJan, Feb, Oct, Nov, Dec002
Solids, total suspendeddaily average≤ 563 lb/dall yearSUM
Nitrogen, ammonia total [as N]daily average≤ 75 lb/dMar–SepSUM
Nitrogen, ammonia total [as N]daily average≤ 150 lb/dJan, Feb, Oct, Nov, DecSUM
Flow, in conduit or thru treatment plantannual average≤ 4.5 MGDall yearSUM
BOD, carbonaceous [5 day, 20 C]daily average≤ 375 lb/dJan, Feb, Oct, Nov, DecSUM
BOD, carbonaceous [5 day, 20 C]daily average≤ 263 lb/dMar–SepSUM
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX2
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX2
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX2
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX2
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX2
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX2
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX2
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX2
IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX2
IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX2
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX2
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX2
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX2
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX2
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX2
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX2
LC50 Pass/Fail Static 24Hr Acute D. Pulexsingle samplereport only (pass=0;fail=1)all yearTXB
LC50 Pass/Fail Static 24Hr Acute Pimephales promelassingle samplereport only (pass=0;fail=1)all yearTXB

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/TX0025011 · MCP: https://passage-data.com/mcp