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Town of Mason

Sewage treatment plant, Mason, Tennessee. NPDES permit TN0026620, in force until Oct 31, 2027. Last 12 months: no values over a limit, 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form G monthly (33 values), outfall INF1 form G monthly (6 values)
Renewal application due
May 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (40)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]minimum≥ 1 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 50 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 55 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 41 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 46 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 lb/dall year001
pHminimum≥ 6 SUall year001
pHmonthly maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 100 mg/Lall year001
Solids, total suspendedweekly average≤ 110 mg/Lall year001
Solids, total suspendeddaily maximum≤ 115 mg/Lall year001
Solids, total suspendedmonthly average≤ 92 lb/dall year001
Solids, total suspendedweekly average≤ 101 lb/dall year001
Solids, total suspendeddaily maximum≤ 105 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
Nitrogen, total [as N]rolling average≤ 14584 lb/yrall year001
Nitrogen, ammonia total [as N]daily maximum≤ 11.18 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 15 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
Phosphorus, total [as P]rolling average≤ 3586 lb/yrall 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
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≤ .13 mg/Lall year001
E. colimonthly geometric mean≤ 126 #/100mLall year001
E. colidaily maximum≤ 941 #/100mLall year001
SSO, Dry Weathermonthly total≤ 0 occur/moall year001
SSO, Wet Weathermonthly total≤ 0 occur/moall year001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %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
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

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/TN0026620 · MCP: https://passage-data.com/mcp