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Shelby County Government

Sewage treatment plant, Millington, Tennessee. NPDES permit TN0023833, in force until Apr 30, 2027. Last 12 months: over a limit once (last March 2026), 5 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form G monthly (18 values)
Renewal application due
Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 6 of 12 reports late

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

Period endingParameterReportedLimitOver by
March 2026Nitrogen, ammonia total [as N], monthly average3.24 mg/L≤ 1.4 mg/L131%

Limits in force (20)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, settleabledaily maximum≤ 1 mL/Lall year
Nitrogen, total [as N]rolling average≤ 80.8 lb/yrMar, Jun, Sep, Dec
Nitrogen, ammonia total [as N]monthly average≤ .75 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 9.25 mg/LJan, Feb, Mar, Apr, Nov, Dec
Phosphorus, total [as P]rolling average≤ 161.7 lb/yrMar, Jun, Sep, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .02 mg/Lall year
E. coligeometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 941 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30 mg/Lall year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/TN0023833 · MCP: https://passage-data.com/mcp