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Town of Huntsville

Sewage treatment plant, Huntsville, Tennessee. NPDES permit TN0020753, in force until Mar 31, 2029. Last 12 months: over a limit once (last November 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (33 values), outfall INF1 form G monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 2 of 24 reports late

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

Period endingParameterReportedLimit
November 2025SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo

Limits in force (44)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 40 mg/Lall year001
Solids, total suspendeddaily maximum≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 75 lb/dall year001
Solids, total suspendedweekly average≤ 100 lb/dall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]quarterly averagereport only (mg/L)all year001
Nitrogen, total [as N]quarterly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/Lall year001
Nitrogen, ammonia total [as N]weekly average≤ 1.8 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 3.8 lb/dall year001
Nitrogen, ammonia total [as N]weekly average≤ 4.5 lb/dall year001
Phosphorus, total [as P]quarterly averagereport only (mg/L)all year001
Phosphorus, total [as P]quarterly averagereport only (lb/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 410 #/100mLall year001
SSO, Dry Weathermonthly total≤ 0 occur/moall year001
SSO, Wet Weathermonthly total≤ 0 occur/moall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 6 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 8 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 38 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 lb/dMay–Oct001
BOD, carbonaceous, percent removaldaily minimum≥ 40 %all year001
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removaldaily minimum≥ 40 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF1
Solids, total suspendeddaily maximumreport only (mg/L)all yearINF1
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF1
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF1
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearINF1
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all yearINF1

How strict are these limits?

Cited limits by parameter: Tennessee'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/TN0020753 · MCP: https://passage-data.com/mcp