NORTHROP GRUMMAN SYSTEMS CORPORATION, ELKTON

NPDES permit MD0000078 · Minor NON-POTW · effective, expires 2028-07-31 · 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.

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

0values over a limit
0required values missing, on 0 form(s)
24of 48 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 (284)

OutfallParameterStatisticLimitMonths
006pHMINIMUM >= 6 SU all year
006pHMINIMUM >= 6 SU all year
006pHMAXIMUM <= 9 SU all year
006pHMAXIMUM <= 9 SU all year
006Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
006Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
006Flow, in conduit or thru treatment plantMO AVG report only all year
006Flow, in conduit or thru treatment plantMO AVG report only all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
006Flow, in conduit or thru treatment plantDAILY MX report only all year
006Chlorine, total residualMX MO AV <= 11 ug/L all year
006Chlorine, total residualMX MO AV <= 11 ug/L all year
006Chlorine, total residualDAILY MX <= 19 ug/L all year
006Chlorine, total residualDAILY MX <= 19 ug/L all year
007pHMINIMUM >= 6 SU all year
007pHMINIMUM >= 6 SU all year
007pHMAXIMUM <= 9 SU all year
007pHMAXIMUM <= 9 SU all year
007Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
007Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
007Flow, in conduit or thru treatment plantMO AVG report only all year
007Flow, in conduit or thru treatment plantMO AVG report only all year
007Flow, in conduit or thru treatment plantDAILY MX report only all year
007Flow, in conduit or thru treatment plantDAILY MX report only all year
007Chlorine, total residualMX MO AV <= 11 ug/L all year
007Chlorine, total residualMX MO AV <= 11 ug/L all year
007Chlorine, total residualDAILY MX <= 19 ug/L all year
007Chlorine, total residualDAILY MX <= 19 ug/L all year
008pHMINIMUM >= 6 SU all year
008pHMINIMUM >= 6 SU all year
008pHMAXIMUM <= 9 SU all year
008pHMAXIMUM <= 9 SU all year
008Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
008Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
008Flow, in conduit or thru treatment plantMO AVG report only all year
008Flow, in conduit or thru treatment plantMO AVG report only all year
008Flow, in conduit or thru treatment plantDAILY MX report only all year
008Flow, in conduit or thru treatment plantDAILY MX report only all year
008Chlorine, total residualMX MO AV <= 11 ug/L all year
008Chlorine, total residualMX MO AV <= 11 ug/L all year
008Chlorine, total residualDAILY MX <= 19 ug/L all year
008Chlorine, total residualDAILY MX <= 19 ug/L all year
009pHMINIMUM >= 6 SU all year
009pHMINIMUM >= 6 SU all year
009pHMAXIMUM <= 9 SU all year
009pHMAXIMUM <= 9 SU all year
009Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
009Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
009Flow, in conduit or thru treatment plantMO AVG report only all year
009Flow, in conduit or thru treatment plantMO AVG report only all year
009Flow, in conduit or thru treatment plantDAILY MX report only all year
009Flow, in conduit or thru treatment plantDAILY MX report only all year
009Chlorine, total residualMX MO AV <= 11 ug/L all year
009Chlorine, total residualMX MO AV <= 11 ug/L all year
009Chlorine, total residualDAILY MX <= 19 ug/L all year
009Chlorine, total residualDAILY MX <= 19 ug/L all year
011pHMINIMUM >= 6 SU all year
011pHMINIMUM >= 6 SU all year
011pHMAXIMUM <= 9 SU all year
011pHMAXIMUM <= 9 SU all year
011Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
011Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
011Flow, in conduit or thru treatment plantMO AVG report only all year
011Flow, in conduit or thru treatment plantMO AVG report only all year
011Flow, in conduit or thru treatment plantDAILY MX report only all year
011Flow, in conduit or thru treatment plantDAILY MX report only all year
011Chlorine, total residualMX MO AV <= 11 ug/kg all year
011Chlorine, total residualMX MO AV <= 11 ug/kg all year
011Chlorine, total residualDAILY MX <= 19 ug/kg all year
011Chlorine, total residualDAILY MX <= 19 ug/kg all year
012pHMINIMUM >= 6 SU all year
012pHMINIMUM >= 6 SU all year
012pHMAXIMUM <= 9 SU all year
012pHMAXIMUM <= 9 SU all year
012Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
012Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
012Flow, in conduit or thru treatment plantMO AVG report only all year
012Flow, in conduit or thru treatment plantMO AVG report only all year
012Flow, in conduit or thru treatment plantDAILY MX report only all year
012Flow, in conduit or thru treatment plantDAILY MX report only all year
012Chlorine, total residualMX MO AV <= 11 ug/L all year
012Chlorine, total residualMX MO AV <= 11 ug/L all year
012Chlorine, total residualDAILY MX <= 19 ug/L all year
012Chlorine, total residualDAILY MX <= 19 ug/L all year
013pHMINIMUM >= 6 SU all year
013pHMINIMUM >= 6 SU all year
013pHMAXIMUM <= 9 SU all year
013pHMAXIMUM <= 9 SU all year
013Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
013Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
013Flow, in conduit or thru treatment plantMO AVG report only all year
013Flow, in conduit or thru treatment plantMO AVG report only all year
013Flow, in conduit or thru treatment plantDAILY MX report only all year
013Flow, in conduit or thru treatment plantDAILY MX report only all year
013Chlorine, total residualMX MO AV <= 11 ug/L all year
013Chlorine, total residualMX MO AV <= 11 ug/L all year
013Chlorine, total residualDAILY MX <= 19 ug/L all year
013Chlorine, total residualDAILY MX <= 19 ug/L all year
018pHMINIMUM >= 6 SU all year
018pHMINIMUM >= 6 SU all year
018pHMAXIMUM <= 9 SU all year
018pHMAXIMUM <= 9 SU all year
018Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
018Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
018Flow, in conduit or thru treatment plantMO AVG report only all year
018Flow, in conduit or thru treatment plantMO AVG report only all year
018Flow, in conduit or thru treatment plantDAILY MX report only all year
018Flow, in conduit or thru treatment plantDAILY MX report only all year
018Chlorine, total residualMX MO AV <= 11 ug/L all year
018Chlorine, total residualMX MO AV <= 11 ug/L all year
018Chlorine, total residualDAILY MX <= 19 ug/L all year
018Chlorine, total residualDAILY MX <= 19 ug/L all year
019pHMINIMUM >= 6 SU all year
019pHMINIMUM >= 6 SU all year
019pHMAXIMUM <= 9 SU all year
019pHMAXIMUM <= 9 SU all year
019Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
019Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
019Flow, in conduit or thru treatment plantMO AVG report only all year
019Flow, in conduit or thru treatment plantMO AVG report only all year
019Flow, in conduit or thru treatment plantDAILY MX report only all year
019Flow, in conduit or thru treatment plantDAILY MX report only all year
019Chlorine, total residualMX MO AV <= 11 ug/L all year
019Chlorine, total residualMX MO AV <= 11 ug/L all year
019Chlorine, total residualDAILY MX <= 19 ug/L all year
019Chlorine, total residualDAILY MX <= 19 ug/L all year
019Perchlorate [ClO4]DAILY MX report only all year
019Perchlorate [ClO4]DAILY MX report only all year
021DichlorobromomethaneDAILY MX report only all year
021DichlorobromomethaneDAILY MX report only all year
021Carbon tetrachlorideDAILY MX <= 5 ug/L all year
021Carbon tetrachlorideDAILY MX <= 5 ug/L all year
021BromoformDAILY MX report only all year
021BromoformDAILY MX report only all year
021DibromochloromethaneDAILY MX report only all year
021DibromochloromethaneDAILY MX report only all year
021ChloroformDAILY MX report only all year
021ChloroformDAILY MX report only all year
021TolueneDAILY MX report only all year
021TolueneDAILY MX report only all year
021BenzeneDAILY MX <= 5 ug/L all year
021BenzeneDAILY MX <= 5 ug/L all year
021ChlorobenzeneDAILY MX report only all year
021ChlorobenzeneDAILY MX report only all year
021Chloroethane, total weightDAILY MX report only all year
021Chloroethane, total weightDAILY MX report only all year
021EthylbenzeneDAILY MX report only all year
021EthylbenzeneDAILY MX report only all year
021Methyl bromide [Bromomethane]DAILY MX report only all year
021Methyl bromide [Bromomethane]DAILY MX report only all year
021Methyl chloride [Chloromethane]DAILY MX report only all year
021Methyl chloride [Chloromethane]DAILY MX report only all year
021Methylene chlorideDAILY MX report only all year
021Methylene chlorideDAILY MX report only all year
021TetrachloroethyleneDAILY MX report only all year
021TetrachloroethyleneDAILY MX report only all year
021TrichlorofluoromethaneDAILY MX report only all year
021TrichlorofluoromethaneDAILY MX report only all year
0211,1-DichloroethaneDAILY MX report only all year
0211,1-DichloroethaneDAILY MX report only all year
0211,1-DichloroethyleneDAILY MX report only all year
0211,1-DichloroethyleneDAILY MX report only all year
0211,1,1-TrichloroethaneDAILY MX report only all year
0211,1,1-TrichloroethaneDAILY MX report only all year
0211,1,2-TrichloroethaneDAILY MX report only all year
0211,1,2-TrichloroethaneDAILY MX report only all year
0211,1,2,2-TetrachloroethaneDAILY MX report only all year
0211,1,2,2-TetrachloroethaneDAILY MX report only all year
0211,2-Dichloroethane, total weightDAILY MX report only all year
0211,2-Dichloroethane, total weightDAILY MX report only all year
0211,2-DichlorobenzeneDAILY MX report only all year
0211,2-DichlorobenzeneDAILY MX report only all year
0211,2-DichloropropaneDAILY MX report only all year
0211,2-DichloropropaneDAILY MX report only all year
021trans-1,2-DichloroethyleneDAILY MX report only all year
021trans-1,2-DichloroethyleneDAILY MX report only all year
0211,3-DichlorobenzeneDAILY MX report only all year
0211,3-DichlorobenzeneDAILY MX report only all year
0211,4-DichlorobenzeneDAILY MX report only all year
0211,4-DichlorobenzeneDAILY MX report only all year
0212-Chloroethyl vinyl ether, [mixed]DAILY MX report only all year
0212-Chloroethyl vinyl ether, [mixed]DAILY MX report only all year
021trans-1,3-DichloropropeneDAILY MX report only all year
021trans-1,3-DichloropropeneDAILY MX report only all year
021cis-1,3-DichloropropeneDAILY MX report only all year
021cis-1,3-DichloropropeneDAILY MX report only all year
021Vinyl chlorideDAILY MX <= 2 ug/L all year
021Vinyl chlorideDAILY MX <= 2 ug/L all year
021Flow, in conduit or thru treatment plantMO AVG report only all year
021Flow, in conduit or thru treatment plantMO AVG report only all year
021Flow, in conduit or thru treatment plantDAILY MX report only all year
021Flow, in conduit or thru treatment plantDAILY MX report only all year
0211,1-DichloroetheneDAILY MX <= 7 ug/L all year
0211,1-DichloroetheneDAILY MX <= 7 ug/L all year
021Perchlorate [ClO4]DAILY MX report only all year
021Perchlorate [ClO4]DAILY MX report only all year
021TrichloroetheneDAILY MX <= 5 ug/L all year
021TrichloroetheneDAILY MX <= 5 ug/L all year
021Volatile hydrocarbonsDAILY MX <= 100 ug/L all year
021Volatile hydrocarbonsDAILY MX <= 100 ug/L all year
022DichlorobromomethaneDAILY MX report only all year
022DichlorobromomethaneDAILY MX report only all year
022Carbon tetrachlorideDAILY MX <= 5 ug/L all year
022Carbon tetrachlorideDAILY MX <= 5 ug/L all year
022BromoformDAILY MX report only all year
022BromoformDAILY MX report only all year
022DibromochloromethaneDAILY MX report only all year
022DibromochloromethaneDAILY MX report only all year
022ChloroformDAILY MX report only all year
022ChloroformDAILY MX report only all year
022TolueneDAILY MX report only all year
022TolueneDAILY MX report only all year
022BenzeneDAILY MX <= 5 ug/L all year
022BenzeneDAILY MX <= 5 ug/L all year
022ChlorobenzeneDAILY MX report only all year
022ChlorobenzeneDAILY MX report only all year
022Chloroethane, total weightDAILY MX report only all year
022Chloroethane, total weightDAILY MX report only all year
022EthylbenzeneDAILY MX report only all year
022EthylbenzeneDAILY MX report only all year
022Methyl bromide [Bromomethane]DAILY MX report only all year
022Methyl bromide [Bromomethane]DAILY MX report only all year
022Methyl chloride [Chloromethane]DAILY MX report only all year
022Methyl chloride [Chloromethane]DAILY MX report only all year
022Methylene chlorideDAILY MX report only all year
022Methylene chlorideDAILY MX report only all year
022TetrachloroethyleneDAILY MX report only all year
022TetrachloroethyleneDAILY MX report only all year
022TrichlorofluoromethaneDAILY MX report only all year
022TrichlorofluoromethaneDAILY MX report only all year
0221,1-DichloroethaneDAILY MX report only all year
0221,1-DichloroethaneDAILY MX report only all year
0221,1-DichloroethyleneDAILY MX report only all year
0221,1-DichloroethyleneDAILY MX report only all year
0221,1,1-TrichloroethaneDAILY MX report only all year
0221,1,1-TrichloroethaneDAILY MX report only all year
0221,1,2-TrichloroethaneDAILY MX report only all year
0221,1,2-TrichloroethaneDAILY MX report only all year
0221,1,2,2-TetrachloroethaneDAILY MX report only all year
0221,1,2,2-TetrachloroethaneDAILY MX report only all year
0221,2-Dichloroethane, total weightDAILY MX report only all year
0221,2-Dichloroethane, total weightDAILY MX report only all year
0221,2-DichlorobenzeneDAILY MX report only all year
0221,2-DichlorobenzeneDAILY MX report only all year
0221,2-DichloropropaneDAILY MX report only all year
0221,2-DichloropropaneDAILY MX report only all year
022trans-1,2-DichloroethyleneDAILY MX report only all year
022trans-1,2-DichloroethyleneDAILY MX report only all year
0221,3-DichlorobenzeneDAILY MX report only all year
0221,3-DichlorobenzeneDAILY MX report only all year
0221,4-DichlorobenzeneDAILY MX report only all year
0221,4-DichlorobenzeneDAILY MX report only all year
0222-Chloroethyl vinyl ether, [mixed]DAILY MX report only all year
0222-Chloroethyl vinyl ether, [mixed]DAILY MX report only all year
022trans-1,3-DichloropropeneDAILY MX report only all year
022trans-1,3-DichloropropeneDAILY MX report only all year
022cis-1,3-DichloropropeneDAILY MX report only all year
022cis-1,3-DichloropropeneDAILY MX report only all year
022Vinyl chlorideDAILY MX <= 2 ug/L all year
022Vinyl chlorideDAILY MX <= 2 ug/L all year
022Flow, in conduit or thru treatment plantMO AVG report only all year
022Flow, in conduit or thru treatment plantMO AVG report only all year
022Flow, in conduit or thru treatment plantDAILY MX report only all year
022Flow, in conduit or thru treatment plantDAILY MX report only all year
0221,1-DichloroetheneDAILY MX <= 7 ug/L all year
0221,1-DichloroetheneDAILY MX <= 7 ug/L all year
022TrichloroetheneDAILY MX <= 5 ug/L all year
022TrichloroetheneDAILY MX <= 5 ug/L all year
022Volatile hydrocarbonsDAILY MX <= 100 ug/L all year
022Volatile hydrocarbonsDAILY MX <= 100 ug/L all year
023pHMINIMUM >= 6 SU all year
023pHMINIMUM >= 6 SU all year
023pHMAXIMUM <= 9 SU all year
023pHMAXIMUM <= 9 SU all year
023Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
023Temp. diff. between up/down stream deg. FDAILY MX <= 0 deg F all year
023Flow, in conduit or thru treatment plantMO AVG report only all year
023Flow, in conduit or thru treatment plantMO AVG report only all year
023Flow, in conduit or thru treatment plantDAILY MX report only all year
023Flow, in conduit or thru treatment plantDAILY MX report only all year
023Chlorine, total residualMX MO AV <= 11 ug/L all year
023Chlorine, total residualMX MO AV <= 11 ug/L all year
023Chlorine, total residualDAILY MX <= 19 ug/L all year
023Chlorine, total residualDAILY MX <= 19 ug/L all year

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