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Williamson County Schools

Sewage treatment plant, Franklin, Tennessee. NPDES permit TN0057835, in force until Apr 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form G monthly (24 values)
Last report on file
September 2026

Limits in force (28)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year
pHdaily minimum≥ 6.5 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≤ 4720 lb/yrall year
Nitrogen, ammonia total [as N]monthly average≤ 1.69 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .887 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LMay–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≤ 510 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 residualdaily maximum≤ .02 mg/Lall year
Chlorine, total residualmonthly average≤ .011 mg/L (alert, not enforceable)all year
E. colimonthly average≤ 126 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4 mg/LMay–Oct
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 40 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 8 mg/LMay–Oct

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/TN0057835 · MCP: https://passage-data.com/mcp