Calpine Mid-Atlantic

NPDES permit DE0000558 · Major NON-POTW · expired, expires 2023-07-31 · 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 2023-07-31 and is expired: 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

0values over a limit
0required values missing, on 0 form(s)
0of 30 forms filed late

Last period with anything received: 2026-06-30.

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (29)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitDAILY AV report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Temperature, water deg. fahrenheitDAILY AV report only Jul, Aug, Sep
001Temperature, water deg. fahrenheitDAILY MX <= 96 deg F Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Temperature, water deg. fahrenheitDAILY MX <= 103 deg F Jul, Aug, Sep
001Temperature, water deg. fahrenheitDAILY AV report only all year
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Thermal DischargeDAILY AV <= 2560 BTU/hr all year
001Thermal DischargeDAILY MX <= 3200 BTU/hr all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Copper, dissolved [as Cu]DAILY MX report only all year
001Copper, dissolved [as Cu]DAILY MX report only all year
001Copper, dissolved [as Cu]DAILY MX report only all year
001Copper, dissolved [as Cu]DAILY MX report only all year
001Iron, total [as Fe]DAILY MX report only all year
001Iron, total [as Fe]DAILY MX report only all year
001Iron, total [as Fe]DAILY MX report only all year
001Iron, total [as Fe]DAILY MX report only all year
001Flow, in conduit or thru treatment plantDAILY AV <= 866 MGD all year
001Pump hoursMO TOTAL report only all year
003pHDAILY MN >= 6 SU all year
003pHDAILY MX <= 10 SU all year
003Flow, in conduit or thru treatment plantDAILY MX <= 3.04 Mgal/mo all year
016pHDAILY MN >= 6 SU all year
016pHDAILY MX <= 9 SU all year
016Flow, in conduit or thru treatment plantDAILY AV <= 3 MGD all year
016Flow, in conduit or thru treatment plantDAILY MX report only all year
016Chlorine, free availableDAILY AV <= .2 mg/L all year
016Chlorine, free availableDAILY MX <= .5 mg/L 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