Davis-Besse Nuclear Power Station

NPDES permit OH0003786 · Major NON-POTW · effective, expires 2031-03-31 · 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.

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

0values over a limit
0required values missing, on 0 form(s)
0of 82 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 20 days after each monitoring period ends (the most common figure among OH permits in EPA's filings — check your permit).

Limits in force (63)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO AVG report only all year
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Oxidants, total residualDAILY 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 residualDAILY MX report only all year
001Mercury, total low levelMO AVG report only all year
001Mercury, total low levelDAILY MX report only all year
001Chlorination durationDAILY MX report only all year
002pHDAILY MN >= 6.5 SU all year
002pHDAILY MX <= 9 SU all year
002Solids, total suspendedMO AVG <= 30 mg/L all year
002Solids, total suspendedDAILY MX <= 100 mg/L all year
002Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
002Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Chlorine, total residualDAILY MX report only all year
002Mercury, total low levelMO AVG report only all year
002Mercury, total low levelDAILY MX report only all year
003Solids, total suspendedMO AVG report only all year
003Solids, total suspendedDAILY MX report only all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
004pHDAILY MN >= 6.5 SU all year
004pHDAILY MX <= 9 SU all year
004Oxidants, total residualDAILY MX report only all year
004Flow, in conduit or thru treatment plantMO AVG report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
004Chlorine, total residualDAILY MX report only all year
004Chlorination durationDAILY MX report only all year
091Oxidants, total residualMO AVG report only all year
091Oxidants, total residualDAILY MX report only all year
091Chlorine, total residualDAILY MX report only all year
091Chlorination durationMO AVG report only all year
091Chlorination durationDAILY MX report only all year
588Sludge waste from secondary clarifiersMO AVG report only Dec
588Sludge waste from secondary clarifiersDAILY MX report only Dec
601BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
601BOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
601Solids, total suspendedMO AVG <= 30 mg/L all year
601Solids, total suspendedDAILY MX <= 45 mg/L all year
601E. coli, MTEC-MFMO GEOMN <= 126 MPN/100mL May, Jun, Jul, Aug, Sep, Oct
601E. coli, MTEC-MFWK GEOMN <= 284 MPN/100mL May, Jun, Jul, Aug, Sep, Oct
601Flow, in conduit or thru treatment plantMO AVG report only all year
601Flow, in conduit or thru treatment plantDAILY MX report only all year
602Solids, total suspendedMO AVG <= 30 mg/L all year
602Solids, total suspendedDAILY MX <= 100 mg/L all year
602Oil and grease, hexane extr methodMO AVG <= 15 mg/L all year
602Oil and grease, hexane extr methodDAILY MX <= 20 mg/L all year
602Flow, in conduit or thru treatment plantMO AVG report only all year
602Flow, in conduit or thru treatment plantDAILY MX report only all year
602HydrazineMO AVG report only all year
602HydrazineDAILY MX report only all year
801Temperature, water deg. fahrenheitMO AVG report only all year
801Temperature, water deg. fahrenheitDAILY MX report only all year
801Flow, in conduit or thru treatment plantMO AVG report only all year
801Flow, in conduit or thru treatment plantDAILY MX report only all year
801Mercury, total low levelMO AVG report only all year
801Mercury, total low levelDAILY MX 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