NASHUA CITY OF

NPDES permit NH0100170 · Major POTW · administratively continued, expires 2020-05-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2020-05-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

10values over a limit
4required values missing, on 4 form(s)
0of 33 forms filed late

Last period with anything received: 2026-07-31. Most often over: Solids, total suspended (5), E. coli, thermotol, MF, MTEC (4), LC50 Static 48Hr Acute Ceriodaphnia dubia (1).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among NH permits in EPA's filings — check your permit).

Limits in force (52)

OutfallParameterStatisticLimitMonths
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 50 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 4006 lb/d all year
001BOD, 5-day, 20 deg. CDAILY MX <= 6676 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 6008 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8 SU all year
001Alkalinity, total [as CaCO3]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedDAILY MX <= 50 mg/L all year
001Solids, total suspendedMO AVG <= 4006 lb/d all year
001Solids, total suspendedDAILY MX <= 6676 lb/d all year
001Solids, total suspendedWKLY AVG <= 6008 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep
001Hardness, total [as CaCO3]DAILY MX report only Apr, May, Jun, Jul, Aug, Sep
001Nickel, total recoverableDAILY MX report only Apr, May, Jun, Jul, Aug, Sep
001Zinc, total recoverableDAILY MX report only Apr, May, Jun, Jul, Aug, Sep
001Aluminum, total recoverableDAILY MX report only Apr, May, Jun, Jul, Aug, Sep
001Cadmium, total recoverableDAILY MX report only Apr, May, Jun, Jul, Aug, Sep
001Lead, total recoverableDAILY MX report only Apr, May, Jun, Jul, Aug, Sep
001Copper, total recoverableMO AVG report only all year
001Copper, total recoverableDAILY MX report only all year
001Copper, total recoverableDAILY MX report only Apr, May, Jun, Jul, Aug, Sep
001E. coli, thermotol, MF, MTECMO GEO <= 126 #/100mL all year
001E. coli, thermotol, MF, MTECDAILY MX <= 406 #/100mL all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMO AVG <= .308 mg/L all year
001Chlorine, total residualDAILY MX <= .532 mg/L all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001LC50 Static 48Hr Acute Ceriodaphnia dubiaDAILY MN >= 100 % Apr, May, Jun, Jul, Aug, Sep
001LC50 Static 48Hr Acute Pimephales promelasDAILY MN >= 100 % Apr, May, Jun, Jul, Aug, Sep
002E. coli, thermotol, MF, MTECMAXIMUM <= 1000 #/100mL all year
003E. coli, thermotol, MF, MTECMAXIMUM <= 1000 #/100mL all year
004E. coli, thermotol, MF, MTECMAXIMUM <= 1000 #/100mL all year
005E. coli, thermotol, MF, MTECMAXIMUM <= 1000 #/100mL all year
006E. coli, thermotol, MF, MTECMAXIMUM <= 1000 #/100mL all year
007E. coli, thermotol, MF, MTECMAXIMUM <= 1000 #/100mL all year
008E. coli, thermotol, MF, MTECMAXIMUM <= 1000 #/100mL all year
009E. coli, thermotol, MF, MTECMAXIMUM <= 1000 #/100mL all year
014E. coli, thermotol, MF, MTECMAXIMUM <= 1000 CFU/100mL all year
014E. coli, thermotol, MF, MTECMAXIMUM <= 1000 #/100mL all year
014Rainfall eventsMO TOTAL report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states