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Williamson County Schools

Sewage treatment plant, Franklin, Tennessee. NPDES permit TN0064297, in force until Jun 30, 2031. Last 12 months: over a limit 2 times (last February 2026), 2 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form G monthly (26 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 5 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026BOD, carbonaceous [5 day, 20 C], daily maximum44 mg/L≤ 20 mg/L120%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average24.5 mg/L≤ 10 mg/L145%

Limits in force (30)

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]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, total [as N]rolling average≤ 2367 lb/yrall year
Nitrogen, ammonia total [as N]monthly average≤ 1.7 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .9 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 5 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 4 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ .2 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .1 lb/dMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ .5 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ .4 lb/dMay–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]rolling average≤ 197 lb/yrall year
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≤ .01 mg/Lall year
Chlorine, total residualdaily maximum≤ .02 mg/Lall year
E. colimonthly average≤ 126 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 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/TN0064297 · MCP: https://passage-data.com/mcp