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Upper Trinity Rgegional Water District

Sewage treatment plant, major discharger, Lewisville, Texas. NPDES permit TX0125172, in force until Feb 3, 2027. Last 12 months: over a limit 12 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (19 values), outfall TX1 form S twice a year, outfall TX1 form Y yearly, outfall TXA form S twice a year
Renewal application due
Aug 7, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
14 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
October 2025Flow, in conduit or thru treatment plant, annual average6 MGD≤ 4 MGD50%
November 2025Flow, in conduit or thru treatment plant, annual average5.97 MGD≤ 4 MGD49%
December 2025Flow, in conduit or thru treatment plant, annual average5.9 MGD≤ 4 MGD48%
January 2026Flow, in conduit or thru treatment plant, annual average5.8 MGD≤ 4 MGD45%
February 2026Flow, in conduit or thru treatment plant, annual average5.8 MGD≤ 4 MGD45%
March 2026Flow, in conduit or thru treatment plant, annual average5.7 MGD≤ 4 MGD43%
April 2026Flow, in conduit or thru treatment plant, annual average5.7 MGD≤ 4 MGD43%
May 2026Flow, in conduit or thru treatment plant, annual average5.7 MGD≤ 4 MGD43%
June 2026Flow, in conduit or thru treatment plant, 2-hour peak14398 gal/min≤ 11111 gal/min30%
June 2026Flow, in conduit or thru treatment plant, annual average5.7 MGD≤ 4 MGD43%
July 2026Flow, in conduit or thru treatment plant, annual average5.7 MGD≤ 4 MGD43%
August 2026Flow, in conduit or thru treatment plant, annual average5.7 MGD≤ 4 MGD43%

Limits in force (57)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Oxygen, dissolved [DO]monthly minimum≥ 5 mg/LApr–Sep001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendeddaily average≤ 12 mg/LApr–Sep001
Solids, total suspendeddaily average≤ 15 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Solids, total suspendeddaily maximum≤ 40 mg/LApr–Sep001
Solids, total suspendeddaily maximum≤ 40 mg/LJan, Feb, Mar, Oct, Nov, Dec001
Solids, total suspendeddaily average≤ 400 lb/dApr–Sep001
Solids, total suspendeddaily average≤ 500 lb/dJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily average≤ 1.7 mg/LApr–Sep001
Nitrogen, ammonia total [as N]daily average≤ 4 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≤ 56 lb/dApr–Sep001
Nitrogen, ammonia total [as N]daily average≤ 133 lb/dJan, Feb, Mar, Oct, Nov, Dec001
Phosphorus, total [as P]daily average≤ 1 mg/Lall 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≤ 11111 gal/minall year001
Flow, in conduit or thru treatment plantannual average≤ 4 MGDall year001
E. colidaily average≤ 126 MPN/100mLall year001
E. colidaily maximum≤ 399 MPN/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≤ 334 lb/dJan, Feb, Mar, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily average≤ 167 lb/dApr–Sep001
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/TX0125172 · MCP: https://passage-data.com/mcp