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

Nashua City of

Sewage treatment plant, major discharger, Nashua, New Hampshire. NPDES permit NH0100170 expired May 31, 2020; its limits still apply. Last 12 months: over a limit 10 times (last September 2026), 4 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (30 values), outfall 001 form T quarterly (11 values), outfall 014 form A monthly (2 values), outfall 002 form Y yearly, outfall 003 form Y yearly, outfall 004 form Y yearly, and 6 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
17 values over a limit, 7 required values missing, 0 of 35 reports late

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

Period endingOutfallParameterReportedLimitOver by
October 2025001E. coli, thermotol, MF, MTEC, daily maximum1553.1 #/100mL≤ 406 #/100mL283%
October 2025001Solids, total suspended, daily maximum180 mg/L≤ 50 mg/L260%
October 2025001Solids, total suspended, daily maximum30459 lb/d≤ 6676 lb/d356%
November 2025001Solids, total suspended, weekly average47 mg/L≤ 45 mg/L4%
December 2025003E. coli, thermotol, MF, MTEC, maximum> 2419.6 #/100mL≤ 1000 #/100mL—
December 2025005E. coli, thermotol, MF, MTEC, maximum> 2419.6 #/100mL≤ 1000 #/100mL—
December 2025014E. coli, thermotol, MF, MTEC, maximum> 2419.6 #/100mL≤ 1000 #/100mL—
June 2026001LC50 Static 48Hr Acute Ceriodaphnia dubia, daily minimum21.2 %≥ 100 %79%
September 2026001LC50 Static 48Hr Acute Ceriodaphnia dubia, daily minimum75.8 %≥ 100 %24%
September 2026001LC50 Static 48Hr Acute Pimephales promelas, daily minimum62.8 %≥ 100 %37%

Limits in force (52)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 50 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 4006 lb/dall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 6676 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 6008 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year001
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 8 SUall year001
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)Apr–Sep001
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≤ 4006 lb/dall year001
Solids, total suspendeddaily maximum≤ 6676 lb/dall year001
Solids, total suspendedweekly average≤ 6008 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedmonthly averagereport only (lb/d)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Apr–Sep001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Apr–Sep001
Nickel, total recoverabledaily maximumreport only (mg/L)Apr–Sep001
Zinc, total recoverabledaily maximumreport only (mg/L)Apr–Sep001
Aluminum, total recoverabledaily maximumreport only (mg/L)Apr–Sep001
Cadmium, total recoverabledaily maximumreport only (mg/L)Apr–Sep001
Lead, total recoverabledaily maximumreport only (mg/L)Apr–Sep001
Copper, total recoverablemonthly averagereport only (mg/L)all year001
Copper, total recoverabledaily maximumreport only (mg/L)all year001
Copper, total recoverabledaily maximumreport only (mg/L)Apr–Sep001
E. coli, thermotol, MF, MTECmonthly geometric mean≤ 126 #/100mLall year001
E. coli, thermotol, MF, MTECdaily maximum≤ 406 #/100mLall 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
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≤ .308 mg/Lall year001
Chlorine, total residualdaily maximum≤ .532 mg/Lall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
LC50 Static 48Hr Acute Ceriodaphnia dubiadaily minimum≥ 100 %Apr–Sep001
LC50 Static 48Hr Acute Pimephales promelasdaily minimum≥ 100 %Apr–Sep001
E. coli, thermotol, MF, MTECmaximum≤ 1000 #/100mLall year002
E. coli, thermotol, MF, MTECmaximum≤ 1000 #/100mLall year003
E. coli, thermotol, MF, MTECmaximum≤ 1000 #/100mLall year004
E. coli, thermotol, MF, MTECmaximum≤ 1000 #/100mLall year005
E. coli, thermotol, MF, MTECmaximum≤ 1000 #/100mLall year006
E. coli, thermotol, MF, MTECmaximum≤ 1000 #/100mLall year007
E. coli, thermotol, MF, MTECmaximum≤ 1000 #/100mLall year008
E. coli, thermotol, MF, MTECmaximum≤ 1000 #/100mLall year009
E. coli, thermotol, MF, MTECmaximum≤ 1000 CFU/100mLall year014
E. coli, thermotol, MF, MTECmaximum≤ 1000 #/100mLall year014
Rainfall eventsmonthly totalreport only (occur/mo)all year014

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/NH0100170 · MCP: https://passage-data.com/mcp