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Seabrook

Sewage treatment plant, major discharger, Seabrook, New Hampshire. NPDES permit NH0101303 expired Apr 30, 2026; its limits still apply. Last 12 months: over a limit 5 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (27 values), form T quarterly (9 values), form TA quarterly (9 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 20 reports late

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

Period endingParameterReportedLimitOver by
November 2025Enterococci, daily maximum133.1 #/100mL≤ 104 #/100mL28%
November 2025Solids, total suspended, monthly average32 mg/L≤ 30 mg/L7%
December 2025Enterococci, daily maximum204.6 #/100mL≤ 104 #/100mL97%
December 2025Enterococci, monthly geometric mean47 #/100mL≤ 35 #/100mL34%
May 2026Enterococci, daily maximum2419.7 #/100mL≤ 104 #/100mL2227%

Limits in force (45)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
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≤ 451 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 751 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 676 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8 SUall year
pHdaily maximumreport only (SU)all 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≤ 451 lb/dall year
Solids, total suspendeddaily maximum≤ 751 lb/dall year
Solids, total suspendedweekly average≤ 676 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year
Cadmium, total [as Cd]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Nickel, total [as Ni]daily maximumreport only (mg/L)all year
Nickel, total [as Ni]daily maximumreport only (mg/L)all year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Coliform, fecal - % samples exceeding limitdaily maximum≤ 10 %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
Flow, in conduit or thru treatment plantrolling average≤ 1.8 MGDall year
Chlorine, total residualmonthly average≤ 240 ug/Lall year
Chlorine, total residualdaily maximum≤ 420 ug/Lall year
Enterococcimonthly geometric mean≤ 35 #/100mLall year
Enterococcidaily maximum≤ 104 #/100mLall year
Coliform, fecal generalmonthly geometric mean≤ 14 #/100mLall 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)minimum≥ 100 %all year
LC50 Static 48Hr Acute Menidiaminimum≥ 100 %all year

How strict are these limits?

Cited limits by parameter: New Hampshire'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/NH0101303 · MCP: https://passage-data.com/mcp