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Littleton Town of

Sewage treatment plant, major discharger, Littleton, New Hampshire. NPDES permit NH0100153 expired Oct 31, 2025; its limits still apply. Last 12 months: over a limit 12 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (44 values), form PA monthly (1 value), form T quarterly (13 values), form TA quarterly (12 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 2 required values missing, 1 of 26 reports late

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

Period endingParameterReportedLimitOver by
October 2025E. coli, daily maximum1413.6 #/100mL≤ 406 #/100mL248%
October 2025Solids, suspended percent removal, monthly average minimum< 28 %≥ 85 %—
October 2025Solids, total suspended, daily maximum3080 mg/L≤ 50 mg/L6060%
October 2025Solids, total suspended, daily maximum9581 lb/d≤ 626 lb/d1431%
October 2025Solids, total suspended, monthly average309.8 mg/L≤ 30 mg/L933%
October 2025Solids, total suspended, monthly average965 lb/d≤ 375 lb/d157%
October 2025Solids, total suspended, weekly average1542.3 mg/L≤ 45 mg/L3327%
October 2025Solids, total suspended, weekly average4803 lb/d≤ 563 lb/d753%
April 2026E. coli, daily maximum461 #/100mL≤ 406 #/100mL14%
May 2026Phosphorus, total [as P], monthly average7.2 lb/d≤ 7.1 lb/d1%
September 2026NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia, monthly average minimum< 6.25 %≥ 16.3 %—
September 2026Phosphorus, total [as P], monthly average7.2 lb/d≤ 7.1 lb/d1%

Limits in force (72)

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≤ 375 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 626 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 563 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≤ 375 lb/dall year
Solids, total suspendeddaily maximum≤ 626 lb/dall year
Solids, total suspendedweekly average≤ 563 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all 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]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]rolling average≤ 125 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 9 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)May–Oct
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)Apr–Oct
Phosphorus, total [as P]monthly average≤ 7.1 lb/dApr–Oct
Phosphorus, total [as P]daily maximumreport only (ug/L)Apr–Oct
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all year
Carbon, dissolved organic [as C]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]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]monthly average≤ 9.5 ug/Lall year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximum≤ 14 ug/Lall year
Copper, total [as Cu]daily maximumreport only (mg/L)all year
Lead, total [as Pb]monthly average≤ 2.6 ug/Lall year
Lead, total [as Pb]daily maximumreport only (mg/L)all year
Lead, total [as Pb]daily maximum≤ 67 ug/Lall 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]monthly average≤ 152 ug/Lall year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Zinc, total [as Zn]daily maximum≤ 152 ug/Lall year
Zinc, total [as Zn]daily maximumreport only (mg/L)all year
Aluminum, total [as Al]daily maximumreport only (mg/L)all year
Aluminum, total [as Al]daily 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
Flow, in conduit or thru treatment plantrolling average≤ 1.5 MGDall year
Chlorine, total residualmonthly average≤ 68 ug/Lall year
Chlorine, total residualdaily maximum≤ 117 ug/Lall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 406 #/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 Ceriodaphnia dubiamonthly average minimum≥ 100 %all year
LC50 Static 48Hr Acute Pimephales promelasmonthly average minimum≥ 100 %all year
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiamonthly average minimum≥ 16.3 %all year
Noel Statre 7Day Chronic Pimephalesmonthly average minimum≥ 16.3 %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/NH0100153 · MCP: https://passage-data.com/mcp