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Town of Chapel Hill

Sewage treatment plant, Chapel Hill, Tennessee. NPDES permit TN0064670, in force until Mar 31, 2029. Last 12 months: over a limit 56 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (30 values), outfall INF1 form G monthly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
45 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
October 2025SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
November 2025BOD, 5-day, 20 deg. C, monthly average32.5 mg/L≤ 30 mg/L8%
November 2025BOD, 5-day, 20 deg. C, weekly average43.5 mg/L≤ 40 mg/L9%
November 2025Chlorine, total residual, daily maximum2.07 mg/L≤ 2 mg/L4%
December 2025BOD, 5-day, 20 deg. C, daily maximum61.7 mg/L≤ 45 mg/L37%
December 2025BOD, 5-day, 20 deg. C, monthly average52.8 mg/L≤ 30 mg/L76%
December 2025BOD, 5-day, 20 deg. C, weekly average61.7 mg/L≤ 40 mg/L54%
January 2026BOD, 5-day, 20 deg. C, daily maximum105.6 mg/L≤ 45 mg/L135%
January 2026BOD, 5-day, 20 deg. C, daily maximum114 lb/d≤ 64 lb/d78%
January 2026BOD, 5-day, 20 deg. C, monthly average54.6 lb/d≤ 43 lb/d27%
January 2026BOD, 5-day, 20 deg. C, monthly average73.6 mg/L≤ 30 mg/L145%
January 2026BOD, 5-day, 20 deg. C, weekly average105.6 mg/L≤ 40 mg/L164%
January 2026BOD, 5-day, 20 deg. C, weekly average114 lb/d≤ 57 lb/d100%
January 2026BOD, 5-day, percent removal, monthly average minimum53.8 %≥ 65 %32%
January 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
February 2026BOD, 5-day, 20 deg. C, daily maximum70.8 mg/L≤ 45 mg/L57%
February 2026BOD, 5-day, 20 deg. C, daily maximum89.4 lb/d≤ 64 lb/d40%
February 2026BOD, 5-day, 20 deg. C, monthly average70.8 mg/L≤ 30 mg/L136%
February 2026BOD, 5-day, 20 deg. C, monthly average83.9 lb/d≤ 43 lb/d95%
February 2026BOD, 5-day, 20 deg. C, weekly average83.9 lb/d≤ 57 lb/d47%
February 2026BOD, 5-day, percent removal, monthly average minimum56.2 %≥ 65 %25%
February 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
March 2026BOD, 5-day, 20 deg. C, daily maximum116.9 mg/L≤ 45 mg/L160%
March 2026BOD, 5-day, 20 deg. C, daily maximum131.9 lb/d≤ 64 lb/d106%
March 2026BOD, 5-day, 20 deg. C, monthly average131.9 lb/d≤ 43 lb/d207%
March 2026BOD, 5-day, 20 deg. C, monthly average76 mg/L≤ 30 mg/L153%
March 2026BOD, 5-day, 20 deg. C, weekly average116.9 mg/L≤ 40 mg/L192%
March 2026BOD, 5-day, 20 deg. C, weekly average57.8 lb/d≤ 57 lb/d1%
March 2026BOD, 5-day, percent removal, monthly average minimum43.7 %≥ 65 %61%
April 2026BOD, 5-day, 20 deg. C, daily maximum160.2 lb/d≤ 64 lb/d150%
April 2026BOD, 5-day, 20 deg. C, daily maximum174.9 mg/L≤ 45 mg/L289%
April 2026BOD, 5-day, 20 deg. C, monthly average114.7 mg/L≤ 30 mg/L282%
April 2026BOD, 5-day, 20 deg. C, monthly average75.5 lb/d≤ 43 lb/d76%
April 2026BOD, 5-day, 20 deg. C, weekly average174.5 mg/L≤ 40 mg/L336%
April 2026BOD, 5-day, 20 deg. C, weekly average68.7 lb/d≤ 57 lb/d21%
April 2026BOD, 5-day, percent removal, monthly average minimum15 %≥ 65 %143%
April 2026Chlorine, total residual, daily maximum2.09 mg/L≤ 2 mg/L5%
May 2026BOD, 5-day, 20 deg. C, daily maximum82.9 lb/d≤ 64 lb/d30%
May 2026BOD, 5-day, 20 deg. C, daily maximum91.8 mg/L≤ 45 mg/L104%
May 2026BOD, 5-day, 20 deg. C, monthly average60.7 lb/d≤ 43 lb/d41%
May 2026BOD, 5-day, 20 deg. C, monthly average73.1 mg/L≤ 30 mg/L144%
May 2026BOD, 5-day, 20 deg. C, weekly average82.9 lb/d≤ 57 lb/d45%
May 2026BOD, 5-day, 20 deg. C, weekly average91.8 mg/L≤ 40 mg/L130%
May 2026BOD, 5-day, percent removal, monthly average minimum29.6 %≥ 65 %101%
June 2026BOD, 5-day, 20 deg. C, daily maximum75 mg/L≤ 45 mg/L67%
June 2026BOD, 5-day, 20 deg. C, monthly average57.1 mg/L≤ 30 mg/L90%
June 2026BOD, 5-day, 20 deg. C, weekly average57.1 mg/L≤ 40 mg/L43%
June 2026BOD, 5-day, 20 deg. C, weekly average60.1 lb/d≤ 57 lb/d5%
June 2026BOD, 5-day, percent removal, monthly average minimum52.4 %≥ 65 %36%
July 2026BOD, 5-day, 20 deg. C, monthly average37.8 mg/L≤ 30 mg/L26%
July 2026BOD, 5-day, 20 deg. C, monthly average43.4 lb/d≤ 43 lb/d1%
July 2026BOD, 5-day, 20 deg. C, weekly average43.4 mg/L≤ 40 mg/L9%
August 2026BOD, 5-day, 20 deg. C, monthly average49.9 lb/d≤ 43 lb/d16%
August 2026BOD, 5-day, 20 deg. C, weekly average40.2 mg/L≤ 40 mg/L1%
August 2026Chlorine, total residual, daily maximum2.05 mg/L≤ 2 mg/L3%
August 2026E. coli, daily maximum613.1 #/100mL≤ 410 #/100mL50%

Limits in force (34)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 1 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 15.6 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 20 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 23.3 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 43 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 57 lb/dall year001
pHminimum≥ 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≤ 83 lb/dall year001
Solids, total suspendedweekly average≤ 110 lb/dall year001
Solids, total suspendeddaily maximum≤ 124 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
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, 5-day, percent removaldaily minimum≥ 40 %all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removaldaily minimum≥ 40 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF1
BOD, 5-day, 20 deg. Cdaily 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

How strict are these limits?

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

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