CALVERT CLIFFS NUC. POWER PLANT, LLC

NPDES permit MD0002399 · Major NON-POTW · effective, expires 2027-10-31 · 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)
4of 46 forms filed late

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

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 (79)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Oxidants, total residualMO AVG <= .0075 mg/L all year
001Oxidants, total residualDAILY MX <= .013 mg/L 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
001Temperature Increase Deg. FDAILY MX <= 12 deg F all year
101BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
101BOD, 5-day, 20 deg. CDAILY MX <= 45 mg/L all year
101Solids, total suspendedMO AVG <= 30 mg/L all year
101Solids, total suspendedDAILY MX <= 45 mg/L all year
101Nitrogen, total [as N]MO AVG report only all year
101Nitrogen, total [as N]DAILY MX report only all year
101Nitrogen, organic total [as N]MO AVG report only all year
101Nitrogen, organic total [as N]DAILY MX report only all year
101Nitrogen, ammonia total [as N]MO AVG report only all year
101Nitrogen, ammonia total [as N]DAILY MX report only all year
101Nitrite + Nitrate total [as N]MO AVG report only all year
101Nitrite + Nitrate total [as N]DAILY MX report only all year
101Phosphorus, total [as P]MO AVG report only all year
101Phosphorus, total [as P]DAILY MX report only all year
101Flow, in conduit or thru treatment plantMO AVG report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
101Chlorine, total residualMO AVG <= .0075 mg/L all year
101Chlorine, total residualDAILY MX <= .013 mg/L all year
101EnterococciMX MO AV <= 35 MPN/100mL all year
101EnterococciDAILY MX <= 104 MPN/100mL all year
101Coliform, fecal generalMX MO AV <= 14 MPN/100mL all year
102pHMINIMUM >= 6 SU all year
102pHDAILY MX <= 9 SU all year
102Solids, total suspendedMO AVG <= 30 mg/L all year
102Solids, total suspendedDAILY MX <= 100 mg/L all year
102Oil & GreaseMO AVG <= 15 mg/L all year
102Oil & GreaseDAILY MX <= 20 mg/L all year
102FlowMO AVG report only all year
102FlowDAILY MX report only all year
103pHMINIMUM >= 6 SU all year
103pHMINIMUM >= 6 SU all year
103pHDAILY MX <= 9 SU all year
103pHDAILY MX <= 9 SU all year
103Solids, total suspendedMO AVG <= 30 mg/L all year
103Solids, total suspendedMO AVG <= 30 mg/L all year
103Solids, total suspendedDAILY MX <= 100 mg/L all year
103Solids, total suspendedDAILY MX <= 100 mg/L all year
103Oil & GreaseMO AVG <= 15 mg/L all year
103Oil & GreaseMO AVG <= 15 mg/L all year
103Oil & GreaseDAILY MX <= 20 mg/L all year
103Oil & GreaseDAILY MX <= 20 mg/L all year
103FlowMO AVG report only all year
103FlowMO AVG report only all year
103FlowDAILY MX report only all year
103FlowDAILY MX report only all year
104pHMINIMUM >= 6 SU all year
104pHDAILY MX <= 9 SU all year
104Solids, total suspendedMO AVG <= 30 mg/L all year
104Solids, total suspendedDAILY MX <= 100 mg/L all year
104Oil & GreaseMO AVG <= 15 mg/L all year
104Oil & GreaseDAILY MX <= 20 mg/L all year
104FlowMO AVG report only all year
104FlowDAILY MX report only all year
106pHMINIMUM >= 6 SU all year
106pHMINIMUM >= 6 SU all year
106pHDAILY MX <= 9 SU all year
106pHDAILY MX <= 9 SU all year
106pHMINIMUM report only all year
106pHMINIMUM report only all year
106pHMAXIMUM report only all year
106pHMAXIMUM report only all year
106Solids, total suspendedMX MO AV <= 30 mg/L all year
106Solids, total suspendedMX MO AV <= 30 mg/L all year
106Solids, total suspendedDAILY MX <= 100 mg/L all year
106Solids, total suspendedDAILY MX <= 100 mg/L all year
106Oil & GreaseMX MO AV <= 15 mg/L all year
106Oil & GreaseMX MO AV <= 15 mg/L all year
106Oil & GreaseDAILY MX <= 20 mg/L all year
106Oil & GreaseDAILY MX <= 20 mg/L all year
106FlowMO AVG report only all year
106FlowMO AVG report only all year
106FlowDAILY MX report only all year
106FlowDAILY 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