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City of Middleton

Sewage treatment plant, Middleton, Tennessee. NPDES permit TN0062642, in force until Jun 30, 2029. Last 12 months: over a limit 56 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (36 values), outfall INF1 form G monthly (3 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
14 values over a limit, 0 required values missing, 0 of 24 reports late

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

All 56 values over a limit
Period endingParameterReportedLimitOver by
December 2025E. coli, daily maximum2420 #/100mL≤ 410 #/100mL490%
January 2026E. coli, daily maximum2420 #/100mL≤ 410 #/100mL490%
January 2026SSO, Wet Weather, monthly total450000 occur/mo≤ 0 occur/mo—
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum37 mg/L≤ 30 mg/L23%
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum59.56 lb/d≤ 50 lb/d19%
February 2026E. coli, daily maximum2420 #/100mL≤ 410 #/100mL490%
February 2026Solids, total suspended, daily maximum200 mg/L≤ 60 mg/L233%
February 2026Solids, total suspended, daily maximum328.6 lb/d≤ 100 lb/d229%
February 2026Solids, total suspended, monthly average59.2 mg/L≤ 50 mg/L18%
February 2026Solids, total suspended, monthly average95.4 lb/d≤ 83 lb/d15%
February 2026Solids, total suspended, weekly average103.33 mg/L≤ 55 mg/L88%
February 2026Solids, total suspended, weekly average168.33 lb/d≤ 92 lb/d83%
March 2026BOD, carbonaceous [5 day, 20 C], daily maximum129.82 lb/d≤ 50 lb/d160%
March 2026BOD, carbonaceous [5 day, 20 C], daily maximum86 mg/L≤ 30 mg/L187%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average33.33 mg/L≤ 20 mg/L67%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average52.22 lb/d≤ 33 lb/d58%
March 2026BOD, carbonaceous [5 day, 20 C], weekly average60 mg/L≤ 25 mg/L140%
March 2026BOD, carbonaceous [5 day, 20 C], weekly average92.87 lb/d≤ 42 lb/d121%
March 2026E. coli, daily maximum2420 #/100mL≤ 410 #/100mL490%
March 2026Solids, total suspended, daily maximum190 mg/L≤ 60 mg/L217%
March 2026Solids, total suspended, daily maximum293 lb/d≤ 100 lb/d193%
March 2026Solids, total suspended, monthly average118 lb/d≤ 83 lb/d42%
March 2026Solids, total suspended, monthly average74 mg/L≤ 50 mg/L48%
March 2026Solids, total suspended, weekly average146.33 mg/L≤ 55 mg/L166%
March 2026Solids, total suspended, weekly average228.4 lb/d≤ 92 lb/d148%
April 2026BOD, carbonaceous [5 day, 20 C], daily maximum34 mg/L≤ 30 mg/L13%
April 2026BOD, carbonaceous [5 day, 20 C], daily maximum54.73 lb/d≤ 50 lb/d9%
April 2026E. coli, daily maximum1046 #/100mL≤ 410 #/100mL155%
May 2026E. coli, daily maximum1733 #/100mL≤ 410 #/100mL323%
May 2026Solids, total suspended, daily maximum363 mg/L≤ 60 mg/L505%
May 2026Solids, total suspended, daily maximum599.4 lb/d≤ 100 lb/d499%
May 2026Solids, total suspended, monthly average138.8 lb/d≤ 83 lb/d67%
May 2026Solids, total suspended, monthly average85.3 mg/L≤ 50 mg/L71%
May 2026Solids, total suspended, weekly average160.33 mg/L≤ 55 mg/L192%
May 2026Solids, total suspended, weekly average263.23 lb/d≤ 92 lb/d186%
June 2026E. coli, daily maximum2420 #/100mL≤ 410 #/100mL490%
June 2026Solids, total suspended, daily maximum136 mg/L≤ 60 mg/L127%
June 2026Solids, total suspended, daily maximum217.8 lb/d≤ 100 lb/d118%
June 2026Solids, total suspended, weekly average113.67 lb/d≤ 92 lb/d24%
June 2026Solids, total suspended, weekly average71.67 mg/L≤ 55 mg/L30%
August 2026Nitrogen, ammonia total [as N], monthly average5.63 mg/L≤ 5 mg/L13%
August 2026Nitrogen, ammonia total [as N], monthly average8.7 lb/d≤ 8 lb/d9%
August 2026Solids, total suspended, daily maximum101.4 lb/d≤ 100 lb/d1%
August 2026Solids, total suspended, daily maximum65 mg/L≤ 60 mg/L8%
September 2026BOD, carbonaceous [5 day, 20 C], daily maximum57 mg/L≤ 30 mg/L90%
September 2026BOD, carbonaceous [5 day, 20 C], daily maximum88.9 lb/d≤ 50 lb/d78%
September 2026BOD, carbonaceous [5 day, 20 C], monthly average26 mg/L≤ 20 mg/L30%
September 2026BOD, carbonaceous [5 day, 20 C], monthly average41.03 lb/d≤ 33 lb/d24%
September 2026BOD, carbonaceous [5 day, 20 C], weekly average36.67 mg/L≤ 25 mg/L47%
September 2026BOD, carbonaceous [5 day, 20 C], weekly average57.6 lb/d≤ 42 lb/d37%
September 2026Solids, total suspended, daily maximum181 mg/L≤ 60 mg/L202%
September 2026Solids, total suspended, daily maximum294.4 lb/d≤ 100 lb/d194%
September 2026Solids, total suspended, monthly average108.2 lb/d≤ 83 lb/d30%
September 2026Solids, total suspended, monthly average67.8 mg/L≤ 50 mg/L36%
September 2026Solids, total suspended, weekly average128.53 lb/d≤ 92 lb/d40%
September 2026Solids, total suspended, weekly average79.67 mg/L≤ 55 mg/L45%

Limits in force (45)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 3 mg/Lall year001
pHdaily minimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 50 mg/Lall year001
Solids, total suspendedweekly average≤ 55 mg/Lall year001
Solids, total suspendeddaily maximum≤ 60 mg/Lall year001
Solids, total suspendedmonthly average≤ 83 lb/dall year001
Solids, total suspendeddaily maximum≤ 100 lb/dall year001
Solids, total suspendedweekly average≤ 92 lb/dall year001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (lb/d)all year001
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 7.5 mg/LMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 8 lb/dMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 17 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 17 lb/dMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 33 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 12 lb/dMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 25 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport 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
Chlorine, total residualdaily maximum≤ 2 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≤ 20 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 33 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 50 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 42 lb/dall year001
BOD, carbonaceous, percent removalmonthly average minimum≥ 65 %all year001
LC50 Static 48Hr Acute Ceriodaphnia dubiaminimum> 1.5 %all year001
LC50 Static 48Hr Acute Pimephales promelasminimum> 1.5 %all year001
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

How strict are these limits?

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

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