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Town of Williamstown

Sewage treatment plant, Williamstown, Vermont. NPDES permit VT0100722 expired Dec 31, 2022; its limits still apply. Last 12 months: no values over a limit, 21 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (21 values)
Last report on file
July 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (29)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 38 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 56 lb/dall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendeddaily maximum≤ 50 mg/Lall year
Solids, total suspendedmonthly average≤ 38 lb/dall year
Solids, total suspendedweekly average≤ 56 lb/dall year
Solids, settleableinstantaneous maximum≤ 1 mL/Lall year
Nitrogen, ammonia total [as N]instantaneous maximum≤ 68.5 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]instantaneous maximum≤ 80.8 mg/LMay, Jun
Nitrogen, ammonia total [as N]instantaneous maximum≤ 24.8 mg/LJul–Oct
Nitrogen, ammonia total [as N]monthly average≤ 37.8 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 43.2 lb/dMay, Jun
Nitrogen, ammonia total [as N]monthly average≤ 9 lb/dJul–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 85.7 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 101 lb/dMay, Jun
Nitrogen, ammonia total [as N]daily maximum≤ 31 lb/dJul–Oct
Phosphorus, total [as P]monthly average≤ .8 mg/Lall year
Phosphorus, total [as P]annual total≤ 366 lb/yrDec
E. coli, thermotol, MF, MTECinstantaneous maximum≤ 77 #/100mLall year
Flow, in conduit or thru treatment plantannual average≤ .15 MGDDec
Chlorine, total residualinstantaneous maximum≤ .08 mg/Lall year
BOD, 5-day, percent removalmonthly minimum≥ 85 %all year
Solids, suspended percent removalmonthly minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Vermont'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/VT0100722 · MCP: https://passage-data.com/mcp