NextEra Energy Seabrook LLc

NPDES permit NH0020338 · Major NON-POTW · administratively continued, expires 2007-03-31 · 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 2007-03-31 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

1values over a limit
6required values missing, on 2 form(s)
0of 125 forms filed late

Last period with anything received: 2026-07-31. Most often over: pH (1).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (83)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO AV MN report only all year
001Temperature, water deg. fahrenheitDAILY MX report only all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8 SU all year
001BiocidesDAILY MX <= 3 mg/L all year
001BiocidesDAILY MX <= 4.3 mg/L all year
001Oxidants, total residualMO AVG <= .15 mg/L all year
001Oxidants, total residualDAILY MX <= .2 mg/L all year
001Flow, in conduit or thru treatment plantMO AVG <= 720 MGD all year
001Flow, in conduit or thru treatment plantDAILY MX <= 720 MGD all year
001Temp. diff. between intake and dischargeMO AVG <= 39 deg F all year
001Temp. diff. between intake and dischargeDAILY MX <= 41 deg F all year
001Temp. diff. between intake and dischargeMO AVG <= 45 deg F all year
001Temp. diff. between intake and dischargeDAILY MX <= 47 deg F all year
001LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)DAILY MN report only all year
001LC50 Static 48Hr Acute MenidiaDAILY MN report only all year
001NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulataDAILY MN report only all year
001Noel Statre 7Day Chronic MenidiaDAILY MN report only all year
003Temperature, water deg. fahrenheitMO AVG report only all year
003Temperature, water deg. fahrenheitDAILY MX <= 120 deg F all year
003Flow rateMO AVG report only all year
003Flow rateDAILY MX <= 500000 gal/d all year
022Flow rateMO AVG report only all year
022Flow rateDAILY MX <= 122400 gal/d all year
022Solids, total suspendedMO AVG <= 30 mg/L all year
022Solids, total suspendedDAILY MX <= 100 mg/L all year
022Oil & GreaseMO AVG <= 15 mg/L all year
022Oil & GreaseDAILY MX <= 20 mg/L all year
023Flow rateMO AVG report only all year
023Flow rateDAILY MX <= 122400 gal/d all year
023Solids, total suspendedMO AVG <= 30 mg/L all year
023Solids, total suspendedDAILY MX <= 100 mg/L all year
023Oil & GreaseMO AVG <= 15 mg/L all year
023Oil & GreaseDAILY MX <= 20 mg/L all year
024Flow rateMO AVG report only all year
024Flow rateDAILY MX <= 122400 gal/d all year
024Solids, total suspendedMO AVG <= 30 mg/L all year
024Solids, total suspendedDAILY MX <= 100 mg/L all year
024Oil & GreaseMO AVG <= 15 mg/L all year
024Oil & GreaseDAILY MX <= 20 mg/L all year
025Flow rateMO AVG report only all year
025Flow rateMO AVG report only all year
025Flow rateMO AVG report only all year
025Flow rateMO AVG report only all year
025Flow rateDAILY MX <= 425000 gal/d all year
025Flow rateDAILY MX <= 210000 gal/d all year
025Flow rateDAILY MX <= 60000 gal/d all year
025Flow rateDAILY MX <= 100000 gal/d all year
025Solids, total suspendedMO AVG <= 30 mg/L all year
025Solids, total suspendedMO AVG <= 30 mg/L all year
025Solids, total suspendedMO AVG <= 30 mg/L all year
025Solids, total suspendedMO AVG <= 30 mg/L all year
025Solids, total suspendedDAILY MX <= 100 mg/L all year
025Solids, total suspendedDAILY MX <= 100 mg/L all year
025Solids, total suspendedDAILY MX <= 100 mg/L all year
025Solids, total suspendedDAILY MX <= 100 mg/L all year
025Oil & GreaseMO AVG <= 15 mg/L Mar, Jun, Sep, Dec
025Oil & GreaseMO AVG <= 15 mg/L Mar, Jun, Sep, Dec
025Oil & GreaseMO AVG <= 15 mg/L all year
025Oil & GreaseMO AVG <= 15 mg/L all year
025Oil & GreaseDAILY MX <= 20 mg/L Mar, Jun, Sep, Dec
025Oil & GreaseDAILY MX <= 20 mg/L Mar, Jun, Sep, Dec
025Oil & GreaseDAILY MX <= 20 mg/L all year
025Oil & GreaseDAILY MX <= 20 mg/L all year
026Flow rateMO AVG report only all year
026Flow rateDAILY MX <= 450000 gal/d all year
026pHMINIMUM >= 6 SU all year
026pHMAXIMUM <= 9 SU all year
026Solids, total suspendedMO AVG <= 30 mg/L all year
026Solids, total suspendedDAILY MX <= 100 mg/L all year
026Oil & GreaseMO AVG <= 15 mg/L all year
026Oil & GreaseDAILY MX <= 20 mg/L all year
026Copper, total [as Cu]MO AVG <= 1 mg/L all year
026Copper, total [as Cu]DAILY MX <= 1 mg/L all year
026Iron, total [as Fe]MO AVG <= 1 mg/L all year
026Iron, total [as Fe]DAILY MX <= 1 mg/L all year
027Flow rateMO AVG report only all year
027Flow rateDAILY MX report only all year
027pHMINIMUM >= 6 SU all year
027pHMAXIMUM <= 9 SU all year
027Oxidants, total residualINST MAX <= .5 mg/L all year
027Oxidants, total residualMO AVG report only all year
027Oxidants, total residualDAILY MX <= 2.6 lb/d 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