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Nerro Supply LLC

Sewerage Systems, Highlands, Texas. NPDES permit TX0085821, in force until Jan 24, 2027. Last 12 months: over a limit 21 times (last June 2026), 2 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (16 values), form Q quarterly
Renewal application due
Jul 28, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 1 of 16 reports late

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

All 21 values over a limit
Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, monthly maximum4.26 mg/L≤ 4 mg/L7%
December 2025Nitrogen, ammonia total [as N], daily average3.34 mg/L≤ 3 mg/L11%
December 2025Solids, total suspended, daily average16.2 mg/L≤ 15 mg/L8%
January 2026Nitrogen, ammonia total [as N], daily average2.92 lb/d≤ 1.1 lb/d165%
January 2026Nitrogen, ammonia total [as N], daily average23.4 mg/L≤ 3 mg/L680%
January 2026Nitrogen, ammonia total [as N], single grab sample34.5 mg/L≤ 15 mg/L130%
February 2026Nitrogen, ammonia total [as N], daily average17.2 mg/L≤ 3 mg/L473%
February 2026Nitrogen, ammonia total [as N], daily average3.03 lb/d≤ 1.1 lb/d175%
February 2026Nitrogen, ammonia total [as N], single grab sample27.9 mg/L≤ 15 mg/L86%
March 2026Nitrogen, ammonia total [as N], daily average3.4 lb/d≤ 1.1 lb/d209%
March 2026Nitrogen, ammonia total [as N], daily average6.1 mg/L≤ 3 mg/L103%
March 2026Solids, total suspended, daily average20.6 mg/L≤ 15 mg/L37%
March 2026Solids, total suspended, daily average9.95 lb/d≤ 5.6 lb/d78%
April 2026Solids, total suspended, daily average23 lb/d≤ 5.6 lb/d311%
April 2026Solids, total suspended, daily average28.2 mg/L≤ 15 mg/L88%
April 2026Solids, total suspended, single grab sample65.3 mg/L≤ 60 mg/L9%
May 2026Oxygen, dissolved [DO], monthly minimum3.2 mg/L≥ 4 mg/L20%
June 2026BOD, carbonaceous [5 day, 20 C], daily average11.7 lb/d≤ 3.7 lb/d216%
June 2026Nitrogen, ammonia total [as N], daily average1.65 lb/d≤ 1.1 lb/d50%
June 2026Nitrogen, ammonia total [as N], daily average4.12 mg/L≤ 3 mg/L37%
June 2026Solids, total suspended, daily average15.9 lb/d≤ 5.6 lb/d184%

Limits in force (18)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]monthly minimum≥ 4 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 15 mg/Lall year
Solids, total suspendedsingle grab sample≤ 60 mg/Lall year
Solids, total suspendeddaily average≤ 5.6 lb/dall year
Nitrogen, ammonia total [as N]daily average≤ 3 mg/Lall year
Nitrogen, ammonia total [as N]single grab sample≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]daily average≤ 1.1 lb/dall year
Flow, in conduit or thru treatment plantdaily average≤ .045 MGDall year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly minimum≥ 1 mg/Lall year
Chlorine, total residualmonthly maximum≤ 4 mg/Lall year
E. colidaily average≤ 63 CFU/100mLall year
E. colisingle grab sample≤ 200 CFU/100mLall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]single grab sample≤ 35 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 3.7 lb/dall year

How strict are these limits?

Cited limits by parameter: Texas's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TX0085821 · MCP: https://passage-data.com/mcp