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Nashville, City of

Sewage treatment plant, Nashville, Illinois. NPDES permit IL0027081, in force until Apr 30, 2027. Last 12 months: over a limit 9 times (last September 2026), 12 of 36 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (19 values), outfall INF form L monthly (4 values)
Renewal application due
Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 2 of 36 reports late

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

Period endingParameterReportedLimitOver by
April 2026Oxygen, dissolved [DO], minimum weekly average5.9 mg/L≥ 6 mg/L2%
May 2026Oxygen, dissolved [DO], minimum weekly average5.8 mg/L≥ 6 mg/L3%
June 2026Oxygen, dissolved [DO], daily minimum4.7 mg/L≥ 5 mg/L6%
June 2026Oxygen, dissolved [DO], minimum weekly average4.7 mg/L≥ 6 mg/L22%
July 2026Oxygen, dissolved [DO], daily minimum4.9 mg/L≥ 5 mg/L2%
July 2026Oxygen, dissolved [DO], minimum weekly average4.9 mg/L≥ 6 mg/L18%
August 2026Oxygen, dissolved [DO], monthly average minimum4.9 mg/L≥ 5.5 mg/L11%
August 2026Solids, total suspended, weekly average54 mg/L≤ 45 mg/L20%
September 2026Oxygen, dissolved [DO], monthly average minimum5.26 mg/L≥ 5.5 mg/L4%

Limits in force (29)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–Jul001
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–Jul001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 37 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 525 lb/dall year001
Solids, total suspendedweekly average≤ 638 lb/dall year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport 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 residualdaily maximum≤ .05 mg/Lall year001
Coliform, fecal generaldaily maximumreport only (#/100mL)May–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 354 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 567 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Coliform, fecal generaldaily maximumreport only (#/100mL)all year002
Flowmonthly totalreport only (#/mo)all year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF

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

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