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City of Chattanooga

Sewage treatment plant, major discharger, Chattanooga, Tennessee. NPDES permit TN0024210 expired Oct 31, 2024; its limits still apply. Last 12 months: over a limit 12 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (42 values), outfall 002 form G monthly (3 values), outfall 003 form G monthly (3 values), outfall 004 form G monthly (3 values), outfall 005 form G monthly (3 values), outfall 006 form G monthly (3 values), and 4 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
27 values over a limit, 0 required values missing, 10 of 120 reports late

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

Period endingParameterReportedLimitOver by
November 2025Chlorine, total residual, daily maximum.32 mg/L≤ .28 mg/L14%
December 2025E. coli, daily maximum1200 #/100mL≤ 487 #/100mL146%
January 2026E. coli, daily maximum2400 #/100mL≤ 487 #/100mL393%
January 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
January 2026SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
February 2026Chlorine, total residual, daily maximum.7 mg/L≤ .28 mg/L150%
March 2026SSO, Wet Weather, monthly total1 occur/mo≤ 0 occur/mo—
May 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
July 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—
August 2026Nitrogen, ammonia total [as N], monthly average15.4 mg/L≤ 15 mg/L3%
August 2026Solids, total suspended, daily maximum82.4 mg/L≤ 45 mg/L83%
September 2026SSO, Dry Weather, monthly total1 occur/mo≤ 0 occur/mo—

Limits in force (98)

ParameterStatisticLimitMonthsOutfall
Rainfall durationmonthly totalreport only (hr)all year001
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 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≤ 32526 lb/dMay, Sep001
Solids, total suspendedmonthly average≤ 28523 lb/dOct001
Solids, total suspendedmonthly average≤ 35028 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Solids, total suspendedmonthly average≤ 25020 lb/dJun–Aug001
Solids, settleabledaily maximum≤ 1 mL/Lall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 15 mg/Lall year001
Nitrogen, ammonia total [as N]weekly average≤ 20 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 30 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 16263 lb/dMay, Sep001
Nitrogen, ammonia total [as N]monthly average≤ 17514 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 14261 lb/dOct001
Nitrogen, ammonia total [as N]weekly average≤ 21684 lb/dMay, Sep001
Nitrogen, ammonia total [as N]weekly average≤ 23352 lb/dJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 19015 lb/dOct001
Nitrogen, ammonia total [as N]monthly average≤ 12510 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 16680 lb/dJun–Aug001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Rainfallmonthly totalreport only (in)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≤ .68 mg/LMay, Sep001
Chlorine, total residualdaily maximum≤ .28 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualdaily maximum≤ .34 mg/LOct001
Chlorine, total residualdaily maximum≤ 1.61 mg/LJun–Aug001
E. coligeometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 487 #/100mLall year001
Rainfall eventsmonthly totalreport only (occur/mo)all year001
Flow, dischargemonthly averagereport only (MGD)all year001
Flow, dischargedaily maximumreport only (MGD)all year001
SSO, Dry Weathermonthly total≤ 0 occur/moall year001
SSO, Wet Weathermonthly total≤ 0 occur/moall year001
Overflowsmonthly totalreport only (occur/mo)all year001
Overflowsmonthly totalreport only (occur/mo)all 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≤ 27105 lb/dMay, Sep001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 29190 lb/dJan, Feb, Mar, Apr, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 23769 lb/dOct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20850 lb/dJun–Aug001
Solids, suspended percent removaldaily minimum≥ 40 %all year001
Solids, suspended percent removalweekly minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 80 %all year001
Carbonaceous oxygen demand, % removaldaily minimum≥ 40 %all year001
Carbonaceous oxygen demand, % removalweekly minimum≥ 65 %all year001
Carbonaceous oxygen demand, % removalmonthly average minimum≥ 79 %all year001
Discharge event observation [Visual Monitoring]monthly totalreport only (occur/mo)all year001
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum> 2.8 %May, Sep001
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum> 6.7 %Jan, Feb, Mar, Apr, Nov, Dec001
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum> 5.5 %Oct001
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiaminimum> 1.2 %Jun–Aug001
IC25 Static Renewal 7 Day Chronic Pimephalesminimum> 2.8 %May, Sep001
IC25 Static Renewal 7 Day Chronic Pimephalesminimum> 6.7 %Jan, Feb, Mar, Apr, Nov, Dec001
IC25 Static Renewal 7 Day Chronic Pimephalesminimum> 5.5 %Oct001
IC25 Static Renewal 7 Day Chronic Pimephalesminimum> 1.2 %Jun–Aug001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Discharge event observation [Visual Monitoring]monthly totalreport only (occur/mo)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Bypass of Treatment Facilityaverage≤ 1 occur/yrOct003
Bypass of Treatment Facilityannual maximum≤ 3 occur/yrDec003
Discharge event observation [Visual Monitoring]monthly totalreport only (occur/mo)all year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Discharge event observation [Visual Monitoring]monthly totalreport only (N=0;Y=1)all year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
Discharge event observation [Visual Monitoring]totalreport only (N=0;Y=1)all year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year006
Bypass of Treatment Facilityannual maximum≤ 12 occur/yrDec006
Discharge event observation [Visual Monitoring]totalreport only (occur/mo)all year006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year007
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year007
Discharge event observation [Visual Monitoring]totalreport only (N=0;Y=1)all year007
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year008
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year008
Discharge event observation [Visual Monitoring]totalreport only (N=0;Y=1)all year008
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year009
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year009
Bypass of Treatment Facilityaverage≤ 4 occur/yrOct009
Bypass of Treatment Facilityannual maximum≤ 6 occur/yrDec009
Discharge event observation [Visual Monitoring]totalreport only (N=0;Y=1)all year009
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/TN0024210 · MCP: https://passage-data.com/mcp