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Town of Smyrna

Sewage treatment plant, major discharger, Smyrna, Tennessee. NPDES permit TN0020541, in force until Nov 30, 2026. Last 12 months: over a limit 4 times (last June 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (2 values), outfall 001 form G monthly (40 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
8 values over a limit, 0 required values missing, 0 of 36 reports late

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

Period endingParameterReportedLimitOver by
January 2026E. coli, daily maximum2419.6 #/100mL≤ 941 #/100mL157%
March 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
April 2026IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia, minimum26.9 %> 99.5 %73%
June 2026BOD, carbonaceous [5 day, 20 C], daily maximum6.9 mg/L≤ 6 mg/L15%

Limits in force (63)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 7 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 19.5 mg/Lall year001
Solids, total suspendedweekly average≤ 26 mg/Lall year001
Solids, total suspendeddaily maximum≤ 30 mg/Lall year001
Solids, total suspendedmonthly average≤ 1464 lb/dall year001
Solids, total suspendedweekly average≤ 1952 lb/dall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ .7 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ .5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 1.05 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ .7 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 1.2 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 1.4 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 1 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 2 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 34 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 34 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 73 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 51 lb/dMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 51 lb/dMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 88 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, inorganic totalmonthly averagereport only (mg/L)all year001
Nitrogen, inorganic totalrolling average≤ 88279 lb/yrall year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]rolling average≤ 17656 lb/yrall year001
Cyanide, total [as CN]monthly average≤ .00521 mg/Lall year001
Zinc, total [as Zn]monthly averagereport only (mg/L)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
Chlorine, total residualmonthly average≤ .01 mg/Lall year001
Chlorine, total residualdaily maximum≤ .02 mg/Lall year001
Chlorine, total residualdaily minimum≥ 1 mg/Lall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 941 #/100mLall year001
E. colidaily maximum≤ 23 #/100mLall year001
SSO, Dry Weathermonthly total≤ 0 occur/moall year001
SSO, Wet Weathermonthly total≤ 0 occur/moall year001
Mercury, total [as Hg]monthly average≤ .00005 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3.25 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 6.5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 4.9 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 9.75 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 6 mg/LMay–Oct001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 13 mg/LJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 244 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 488 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 366 lb/dMay–Oct001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 732 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year001
BOD, carbonaceous, percent removaldaily minimum≥ 40 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removaldaily minimum≥ 40 %all year001
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum> 99.5 %all year001
IC25 Static Renewal 7 Day Chronic Pimephalesminimum> 99.5 %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/TN0020541 · MCP: https://passage-data.com/mcp