Clean Water Act discharge permit · NPDES MD0002399

CALVERT CLIFFS NUCLEAR POWER PLANT, LLC, Lusby, MD: NPDES MD0002399 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
17Pollutants under a numeric limit
3Pollutants with an effluent exceedance

CALVERT CLIFFS NUCLEAR POWER PLANT, LLC, held by CALVERT CLIFFS NUC. POWER PLANT, LLC, holds NPDES permit MD0002399, which discharges to West Chesapeake Bay. EPA’s file records it issued July 26, 2016 and expiring August 31, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	CALVERT CLIFFS NUCLEAR POWER PLANT, LLC
Permittee as filed	CALVERT CLIFFS NUC. POWER PLANT, LLC
NPDES ID	MD0002399
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Not a publicly owned treatment works
Issued	July 26, 2016
Expiration date	August 31, 2021
Issuing agency	Maryland Department of the Environment
Address	Lusby, MD 20657
Receiving water	WEST CHESAPEAKE BAY
Receiving water impaired	303(D) Listed
Subwatershed	Parker Creek-Chesapeake Bay (HUC 020600040403)
Other EPA IDs (FRS)	RCRA handler MDD000621243; ICIS-AIR source MD0000002400900012

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

Effluent limits and exceedances

17Pollutants on file
17Under a numeric limit
7With a violation of any kind
3With an effluent exceedance

An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.

Pollutant or measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
BOD, 5-day, 20 deg. C	2	6	6	March 31, 2019	99,999% over the limit
pH	16	6	2	December 31, 2014
Solids, total suspended	14	6	2	July 31, 2018	146% over the limit
Nitrogen, total [as N]	2	20	0
Flow	12	6	0
Oil & Grease	12	4	0
Flow, in conduit or thru treatment plant	4	4	0
Nitrogen, organic total [as N]	2	0	0
Nitrogen, ammonia total [as N]	2	0	0
Nitrite + Nitrate total [as N]	2	0	0
Phosphorus, total [as P]	2	0	0
Oxidants, total residual	2	0	0
Chlorine, total residual	2	0	0
Enterococci	2	0	0
Temperature, water deg. fahrenheit	1	0	0
Temperature Increase Deg. F	1	0	0
Coliform, fecal general	1	0	0

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES MD0002399.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

Watch this permit

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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MD0002399 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers NPDES permit MD0002399, held by CALVERT CLIFFS NUCLEAR POWER PLANT, LLC in Lusby, MD, which discharges to West Chesapeake Bay. The permit is listed as administratively continued and a Major Discharger, with 17 pollutants under a numeric limit and 3 pollutants with an effluent exceedance, and it was issued July 26, 2016 with an expiration date of August 31, 2021.