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Town of Somerville

Sewage treatment plant, Somerville, Tennessee. NPDES permit TN0021652, in force until Oct 31, 2027. Last 12 months: over a limit 7 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (35 values), outfall INF1 form G monthly (4 values)
Renewal application due
May 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingParameterReportedLimitOver by
November 2025BOD, carbonaceous [5 day, 20 C], monthly average25.5 mg/L≤ 25 mg/L2%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average34 mg/L≤ 25 mg/L36%
March 2026E. coli, monthly geometric mean222 #/100mL≤ 126 #/100mL76%
May 2026Nitrogen, ammonia total [as N], daily maximum12.9 mg/L≤ 12 mg/L8%
May 2026Nitrogen, ammonia total [as N], monthly average8.86 mg/L≤ 6 mg/L48%
May 2026Nitrogen, ammonia total [as N], weekly average12.9 mg/L≤ 9 mg/L43%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average27.7 mg/L≤ 25 mg/L11%

Limits in force (41)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 1 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 100 mg/Lall year001
Solids, total suspendedweekly average≤ 110 mg/Lall year001
Solids, total suspendeddaily maximum≤ 120 mg/Lall year001
Solids, total suspendedmonthly average≤ 746 lb/dall year001
Solids, total suspendedweekly average≤ 821 lb/dall year001
Solids, total suspendeddaily maximum≤ 896 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≤ 6 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 9 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 12 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 45 lb/dMay–Oct001
Nitrogen, ammonia total [as N]weekly average≤ 67 lb/dMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 90 lb/dall year001
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 residualmonthly average≤ .11 mg/Lall year001
Chlorine, total residualdaily maximum≤ .18 mg/Lall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 941 #/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≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 35 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 187 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 261 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 299 lb/dall year001
BOD, carbonaceous, percent removalmonthly average minimum≥ 65 %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
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/TN0021652 · MCP: https://passage-data.com/mcp