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Manchester City of

Sewage treatment plant, major discharger, Manchester, New Hampshire. NPDES permit NH0100447 expired Apr 30, 2020; its limits still apply. Last 12 months: over a limit 10 times (last April 2026), 3 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (36 values), outfall 001 form B quarterly (12 values), outfall 011 form A yearly, outfall 018 form A yearly, outfall 031 form A yearly, outfall 039 form A yearly, and 11 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 9 required values missing, 1 of 31 reports late

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

Period endingOutfallParameterReportedLimitOver by
December 2025011E. coli, colony forming units [CFU], maximum single sample> 2419.6 CFU/100mL≤ 1000 CFU/100mL—
December 2025031E. coli, colony forming units [CFU], maximum single sample> 2419.6 CFU/100mL≤ 1000 CFU/100mL—
December 2025043E. coli, colony forming units [CFU], maximum single sample> 2419.6 CFU/100mL≤ 1000 CFU/100mL—
December 2025044E. coli, colony forming units [CFU], maximum single sample> 2419.6 CFU/100mL≤ 1000 CFU/100mL—
December 2025045E. coli, colony forming units [CFU], maximum single sample> 2419.6 CFU/100mL≤ 1000 CFU/100mL—
December 2025046E. coli, colony forming units [CFU], maximum single sample> 2419.6 CFU/100mL≤ 1000 CFU/100mL—
December 2025047E. coli, colony forming units [CFU], maximum single sample> 2419.6 CFU/100mL≤ 1000 CFU/100mL—
December 2025053E. coli, colony forming units [CFU], maximum single sample> 2419.6 CFU/100mL≤ 1000 CFU/100mL—
December 2025054E. coli, colony forming units [CFU], maximum single sample> 2419.6 CFU/100mL≤ 1000 CFU/100mL—
April 2026001Phosphorus, total [as P], monthly average302 lb/d≤ 236 lb/d28%

Limits in force (65)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendeddaily maximum≤ 50 mg/Lall year001
Solids, total suspendedmonthly average≤ 8510 lb/dall year001
Solids, total suspendeddaily maximum≤ 14190 lb/dall year001
Solids, total suspendedweekly average≤ 12770 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedweekly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedmonthly averagereport only (lb/d)all year001
Solids, total suspendeddaily maximumreport only (lb/d)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly average≤ 236 lb/dApr–Oct001
Phosphorus, total [as P]daily maximumreport only (lb/d)Apr–Oct001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Nickel, total recoverabledaily maximumreport only (mg/L)all year001
Zinc, total recoverabledaily maximumreport only (mg/L)all year001
Aluminum, total recoverabledaily maximumreport only (mg/L)all year001
Cadmium, total recoverabledaily maximumreport only (mg/L)all year001
Lead, total recoverabledaily maximumreport only (mg/L)all year001
Copper, total recoverablemonthly average≤ 24 ug/Lall year001
Copper, total recoverabledaily maximumreport only (mg/L)all year001
Copper, total recoverabledaily maximumreport only (ug/L)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 residualmonthly average≤ .13 mg/Lall year001
Chlorine, total residualdaily maximum≤ .22 mg/Lall year001
E. coli, colony forming units [CFU]monthly geometric mean≤ 126 CFU/100mLall year001
E. coli, colony forming units [CFU]monthly geometric meanreport only (CFU/100mL)all year001
E. coli, colony forming units [CFU]daily maximum≤ 406 CFU/100mLall year001
E. coli, colony forming units [CFU]daily maximumreport only (CFU/100mL)all year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 45 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 7090 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 12770 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 11350 lb/dall year001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]weekly averagereport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (lb/d)all year001
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (lb/d)all year001
LC50 Static 48Hr Acute Ceriodaphnia dubiamonthly average minimum≥ 100 %all year001
LC50 Static 48Hr Acute Pimephales promelasmonthly average minimum≥ 100 %all year001
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiamonthly average minimum≥ 8.5 %all year001
Noel Statre 7Day Chronic Pimephalesmonthly average minimum≥ 8.5 %all year001
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year011
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year018
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year031
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year039
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year043
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year044
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year045
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year046
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year047
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year050
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year051
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year052
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year053
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year054
E. coli, colony forming units [CFU]maximum single sample≤ 1000 CFU/100mLall year055

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/NH0100447 · MCP: https://passage-data.com/mcp