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Loudon Utilities Board

Sewage treatment plant, major discharger, Loudon, Tennessee. NPDES permit TN0058181, in force until Nov 30, 2026. Last 12 months: over a limit 10 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (31 values), outfall INF1 form G monthly (6 values)
Renewal application due
Jun 3, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
12 values over a limit, 1 required value missing, 0 of 24 reports late

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

Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, daily maximum1.2 mg/L≤ 1.1 mg/L9%
October 2025SSO, Dry Weather, monthly total3 occur/mo≤ 0 occur/mo—
January 2026Chlorine, total residual, daily maximum1.2 mg/L≤ 1.1 mg/L9%
January 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
March 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
May 2026SSO, Wet Weather, monthly total2 occur/mo≤ 0 occur/mo—
June 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
July 2026E. coli, daily maximum1046.2 #/100mL≤ 487 #/100mL115%
July 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
August 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—

Limits in force (37)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 1 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 40 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 3502 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 4670 lb/dall year001
pHdaily minimum≥ 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≤ 3502 lb/dall year001
Solids, total suspendedweekly average≤ 4670 lb/dall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Nitrogen, total [as N]daily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Phosphorus, total [as P]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec001
Phosphorus, total [as P]daily maximumreport only (lb/d)Mar, Jun, Sep, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ 1.1 mg/Lall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 487 #/100mLall year001
SSO, Dry Weathermonthly total≤ 0 occur/moall year001
SSO, Wet Weathermonthly total≤ 0 occur/moall year001
BOD, 5-day, percent removaldaily minimum≥ 40 %all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removaldaily minimum≥ 40 %all year001
Solids, suspended percent removalmonthly average minimum≥ 69 %all year001
LC50 Static 48Hr Acute Ceriodaphnia dubiaminimum> 6 %all year001
LC50 Static 48Hr Acute Pimephales promelasminimum> 6 %all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF1
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearINF1
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

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/TN0058181 · MCP: https://passage-data.com/mcp