Passage Data · Check a report · Use it from your AI

Durham W W T F

Sewage treatment plant, major discharger, Durham, New Hampshire. NPDES permit NH0100455 expired Jan 29, 2005; its limits still apply. Last 12 months: over a limit once (last November 2025), 2 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (32 values), form B quarterly (8 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
November 2025Coliform, fecal general, daily maximum116.2 #/100mL≤ 14 #/100mL730%

Limits in force (40)

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≤ 630 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 1043 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly average≤ 940 lb/dall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8 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≤ 630 lb/dall year
Solids, total suspendeddaily maximum≤ 1043 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly average≤ 940 lb/dall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nickel, total recoverabledaily maximumreport only (mg/L)all year
Zinc, total recoverablemonthly average minimumreport only (mg/L)all year
Zinc, total recoverabledaily maximumreport only (mg/L)all year
Cadmium, total recoverabledaily maximumreport only (mg/L)all year
Lead, total recoverabledaily maximumreport only (mg/L)all year
Chromium, total recoverabledaily maximumreport only (mg/L)all year
Copper, total recoverablemonthly averagereport only (mg/L)all year
Copper, total recoverabledaily maximumreport only (mg/L)all 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≤ .05 mg/Lall year
Chlorine, total residualdaily maximum≤ .05 mg/Lall year
Coliform, fecal generalmonthly geometric mean≤ 14 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 14 #/100mLall year
Coliform, fecal generaldaily maximum≤ 14 #/100mLall year
Coliform, fecal generalmaximumreport only (MPN/100mL)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)daily minimum≥ 100 %all year
LC50 Static 48Hr Acute Menidiadaily minimum≥ 100 %all year
NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulatadaily minimum≥ 58.8 %all year
Noel Statre 7Day Chronic Menidiadaily minimum≥ 58.8 %all year

How strict are these limits?

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

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/NH0100455 · MCP: https://passage-data.com/mcp