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Upper Trinity Regional Water District

Sewage treatment plant, major discharger, Lewisville, Texas. NPDES permit TX0123781, in force until Jan 23, 2028. Last 12 months: over a limit 2 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (21 values), outfall 002 form A monthly (21 values), outfall TX1 form S twice a year, outfall TX1 form Y yearly, outfall TXA 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 29 reports late

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

Period endingParameterReportedLimitOver by
July 2026Flow, in conduit or thru treatment plant, annual average4.06 MGD≤ 4 MGD2%
August 2026Flow, in conduit or thru treatment plant, annual average4.09 MGD≤ 4 MGD2%

Limits in force (82)

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≤ 188 lb/dall year001
Nitrogen, ammonia total [as N]daily average≤ 1.7 mg/LApr–Sep001
Nitrogen, ammonia total [as N]daily average≤ 3 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LApr–Sep001
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily average≤ 21 lb/dApr–Sep001
Nitrogen, ammonia total [as N]daily average≤ 38 lb/dJan, Feb, Mar, Oct, Nov, Dec001
Phosphorus, total [as P]daily average≤ 1 mg/Lall year001
Phosphorus, total [as P]daily maximum≤ 4 mg/Lall year001
Phosphorus, total [as P]daily average≤ 13 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≤ 4167 gal/minall year001
Flow, in conduit or thru treatment plantannual average≤ 1.5 MGDall 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, Mar, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily average≤ 5 mg/LApr–Sep001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LJan, Feb, Mar, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/LApr–Sep001
BOD, carbonaceous [5 day, 20 C]daily average≤ 125 lb/dJan, Feb, Mar, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily average≤ 63 lb/dApr–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≤ 500 lb/dall year002
Nitrogen, ammonia total [as N]daily average≤ 1.7 mg/LApr–Sep002
Nitrogen, ammonia total [as N]daily average≤ 3 mg/LJan, Feb, Mar, Oct, Nov, Dec002
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LApr–Sep002
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LJan, Feb, Mar, Oct, Nov, Dec002
Nitrogen, ammonia total [as N]daily average≤ 57 lb/dApr–Sep002
Nitrogen, ammonia total [as N]daily average≤ 100 lb/dJan, Feb, Mar, Oct, Nov, Dec002
Phosphorus, total [as P]daily average≤ 1 mg/Lall year002
Phosphorus, total [as P]daily maximum≤ 4 mg/Lall year002
Phosphorus, total [as P]daily average≤ 33 lb/dall year002
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≤ 11111 gal/minall year002
Flow, in conduit or thru treatment plantannual average≤ 4 MGDall year002
E. colidaily average≤ 126 MPN/100mLall year002
E. colidaily maximum≤ 399 MPN/100mLall year002
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/LJan, Feb, Mar, Oct, Nov, Dec002
BOD, carbonaceous [5 day, 20 C]daily average≤ 5 mg/LApr–Sep002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LJan, Feb, Mar, Oct, Nov, Dec002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/LApr–Sep002
BOD, carbonaceous [5 day, 20 C]daily average≤ 334 lb/dJan, Feb, Mar, Oct, Nov, Dec002
BOD, carbonaceous [5 day, 20 C]daily average≤ 167 lb/dApr–Sep002
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #17-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #1monthly average minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #27-day minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all yearTX1
Whole effluent toxicity - retest #2monthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (pass=0;fail=1)all yearTX1
IC25 Low Flow Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (pass=0;fail=1)all yearTX1
IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
IC25 Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
IC25 Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day minimumreport only (%)all yearTX1
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly average minimumreport only (%)all yearTX1
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas7-day minimumreport only (%)all yearTX1
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasmonthly average minimumreport only (%)all yearTX1
Whole effluent toxicity - retest #1single samplereport only (pass=0;fail=1)all yearTXA
Whole effluent toxicity - retest #2single samplereport only (pass=0;fail=1)all yearTXA
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/TX0123781 · MCP: https://passage-data.com/mcp