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Town of Mountain City

Sewage treatment plant, major discharger, Mountain City, Tennessee. NPDES permit TN0024945, in force until Jul 31, 2031. Last 12 months: over a limit 5 times (last February 2026), 3 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (41 values), outfall 001 form T monthly (2 values), outfall INF1 form G monthly (6 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
26 values over a limit, 4 required values missing, 4 of 24 reports late

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

Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], daily maximum> 9 mg/L≤ 25 mg/L—
October 2025BOD, carbonaceous, percent removal, daily minimum< 89 %≥ 40 %—
December 2025Solids, suspended percent removal, monthly average minimum83 %≥ 85 %13%
February 2026SSO, Wet Weather, monthly total4 occur/mo≤ 0 occur/mo—
February 2026Solids, suspended percent removal, monthly average minimum81 %≥ 85 %27%

Limits in force (60)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/Lall 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≤ 300 lb/dall year001
Solids, total suspendedweekly average≤ 400 lb/dall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (lb/d)all year001
Nitrogen, total [as N]daily maximumreport only (lb/d)all year001
Nitrogen, total [as N]rolling average≤ 37819 lb/yrall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.37 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 2.77 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 2.05 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 4.15 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 2.74 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 5.53 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 13.7 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 27.7 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 20.55 lb/dMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 41.53 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 27.41 lb/dMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 55.38 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
Phosphorus, total [as P]rolling average≤ 5724 lb/yrall 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
Chlorine, total residualdaily maximum≤ .05 mg/Lall 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≤ 15 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 18.8 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 20 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 26.3 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 25 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 150 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 188 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 200 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 263 lb/dJan, Feb, Mar, Apr, Nov, Dec001
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
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum≥ 36.5 %all year001
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasminimum≥ 36.5 %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/TN0024945 · MCP: https://passage-data.com/mcp