Northrop Grumman Corporation

NPDES permit UT0024805 · Major NON-POTW · effective, expires 2028-06-30 · 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
4required values missing, on 2 form(s)
3of 32 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 (120)

OutfallParameterStatisticLimitMonths
001Flow rateMX MO AV <= .35 MGD all year
001Oxygen, dissolved [DO]DAILY MN >= 4.5 mg/L all year
001BOD, 5-day, 20 deg. CMX MO AV <= 25 mg/L all year
001BOD, 5-day, 20 deg. CMX WK AV <= 35 mg/L all year
001OzoneDAILY MX <= .1 mg/L all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMX MO AV <= 25 mg/L all year
001Solids, total suspendedMX WK AV <= 35 mg/L all year
001Nitrogen, ammonia total [as N]MX MO AV <= 5 mg/L Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MX MO AV <= 9 mg/L Oct, Nov, Dec
001Nitrogen, ammonia total [as N]MX MO AV <= 11 mg/L Jan, Feb, Mar
001Nitrogen, ammonia total [as N]MX MO AV <= 6 mg/L Apr, May, Jun
001Nitrogen, ammonia total [as N]MX WK AV <= 6 mg/L Apr, May, Jun
001Nitrogen, ammonia total [as N]MX WK AV <= 5 mg/L Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MX WK AV <= 9 mg/L Oct, Nov, Dec
001Nitrogen, ammonia total [as N]MX WK AV <= 11 mg/L Jan, Feb, Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 16 mg/L Apr, May, Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 14 mg/L Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 15 mg/L Oct, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 13 mg/L Jan, Feb, Mar
001Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
001Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
001Phosphorus, total [as P]ANNL AVG <= 1 mg/L all year
001Phosphorus, total [as P]30DA AVG report only all year
001Phosphorus, total [as P]30DA AVG report only all year
001Arsenic, total recoverable30DA AVG report only all year
001Selenium, total recoverable30DA AVG report only all year
001Chromium, total [as Cr]30DA AVG report only all year
001Lead, total [as Pb]30DA AVG report only all year
001Nickel, total [as Ni]30DA AVG report only all year
001Silver total recoverable30DA AVG report only all year
001Zinc, total recoverable30DA AVG report only all year
001Aluminum, total recoverable30DA AVG report only all year
001Cadmium, total recoverable30DA AVG report only all year
001Cadmium, total recoverableDAILY MX <= 7.2 ug/L all year
001Copper, total recoverable30DA AVG report only all year
001Selenium, dissolved [as Se]DAILY MX <= 18.4 ug/L all year
001Oil and greaseDAILY MX <= 10 mg/L all year
001Phosphate, ortho [as P]30DA AVG report only all year
001E. coliMX MO AV <= 126 #/100mL all year
001E. coliMX WK AV <= 157 #/100mL all year
001Perchlorate [ClO4]30DA AVG report only all year
001Solids, total dissolvedMX MO AV <= 4700 mg/L Jan, Feb, Nov, Dec
001Solids, total dissolvedMX MO AV <= 3800 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Solids, total dissolvedDAILY MX <= 6300 mg/L Jan, Feb, Nov, Dec
001Solids, total dissolvedDAILY MX <= 4900 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, nitrate total [as NO3]30DA AVG report only all year
001Nitrogen, nitrite total [as NO2]30DA AVG report only all year
001Mercury, total recoverable30DA AVG report only all year
001IsopropanolDAILY MX <= 1 mg/L all year
001Volatile fraction organics [EPA 624]DAILY MN report only all year
001Volatile fraction organics [EPA 624]DAILY MX <= 2 mg/L all year
001Chemical Oxygen Demand [COD]30DA AVG report only all year
001Pass/Fail Static 48Hr Acute Daphnia MagnaDAILY MX <= 0 pass=0;fail=1 Jan, Feb, Mar, Jul, Aug, Sep
001Pass/Fail Static 48Hr Acute Daphnia MagnaDAILY MX <= 0 pass=0;fail=1 Jan, Feb, Mar, Jul, Aug, Sep
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only Jan, Feb, Mar, Jul, Aug, Sep
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only Jan, Feb, Mar, Jul, Aug, Sep
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelasDAILY MX <= 0 pass=0;fail=1 Apr, May, Jun, Oct, Nov, Dec
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelasDAILY MX <= 0 pass=0;fail=1 Apr, May, Jun, Oct, Nov, Dec
002Flow rateMX MO AV <= .16 MGD all year
002Oxygen, dissolved [DO]DAILY MN >= 4.5 mg/L all year
002BOD, 5-day, 20 deg. CMX MO AV <= 25 mg/L all year
002BOD, 5-day, 20 deg. CMX WK AV <= 35 mg/L all year
002OzoneDAILY MX <= .1 mg/L all year
002pHDAILY MN >= 6.5 SU all year
002pHDAILY MX <= 9 SU all year
002Solids, total suspendedMX MO AV <= 25 mg/L all year
002Solids, total suspendedMX WK AV <= 35 mg/L all year
002Nitrogen, ammonia total [as N]MX MO AV <= 5 mg/L Jul, Aug, Sep
002Nitrogen, ammonia total [as N]MX MO AV <= 9 mg/L Oct, Nov, Dec
002Nitrogen, ammonia total [as N]MX MO AV <= 11 mg/L Jan, Feb, Mar
002Nitrogen, ammonia total [as N]MX MO AV <= 6 mg/L Apr, May, Jun
002Nitrogen, ammonia total [as N]MX WK AV <= 5 mg/L Jul, Aug, Sep
002Nitrogen, ammonia total [as N]MX WK AV <= 6 mg/L Apr, May, Jun
002Nitrogen, ammonia total [as N]MX WK AV <= 9 mg/L Oct, Nov, Dec
002Nitrogen, ammonia total [as N]MX WK AV <= 11 mg/L Jan, Feb, Mar
002Nitrogen, ammonia total [as N]DAILY MX <= 14 mg/L Jul, Aug, Sep
002Nitrogen, ammonia total [as N]DAILY MX <= 16 mg/L Apr, May, Jun
002Nitrogen, ammonia total [as N]DAILY MX <= 15 mg/L Oct, Nov, Dec
002Nitrogen, ammonia total [as N]DAILY MX <= 13 mg/L Jan, Feb, Mar
002Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
002Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
002Phosphorus, total [as P]ANNL AVG <= 1 mg/L all year
002Phosphorus, total [as P]30DA AVG report only all year
002Phosphorus, total [as P]30DA AVG report only all year
002Arsenic, total recoverable30DA AVG report only all year
002Selenium, total recoverable30DA AVG report only all year
002Chromium, total [as Cr]30DA AVG report only all year
002Chromium, total [as Cr]DAILY MX report only all year
002Lead, total [as Pb]30DA AVG report only all year
002Nickel, total [as Ni]30DA AVG report only all year
002Silver total recoverable30DA AVG report only all year
002Zinc, total recoverable30DA AVG report only all year
002Aluminum, total recoverable30DA AVG report only all year
002Cadmium, total recoverable30DA AVG report only all year
002Cadmium, total recoverableDAILY MX <= 7.2 ug/L all year
002Copper, total recoverable30DA AVG report only all year
002Selenium, dissolved [as Se]DAILY MX <= 18.4 ug/L all year
002Oil and greaseDAILY MX <= 10 mg/L all year
002Phosphate, ortho [as P]30DA AVG report only all year
002E. coliMX MO AV <= 126 #/100mL all year
002E. coliMX WK AV <= 157 #/100mL all year
002Perchlorate [ClO4]30DA AVG report only all year
002Solids, total dissolvedMX MO AV <= 4700 mg/L Jan, Feb, Nov, Dec
002Solids, total dissolvedMX MO AV <= 3800 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
002Solids, total dissolvedDAILY MX <= 6300 mg/L Jan, Feb, Nov, Dec
002Solids, total dissolvedDAILY MX <= 4900 mg/L Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
002Nitrogen, nitrate total [as NO3]30DA AVG report only all year
002Nitrogen, nitrite total [as NO2]30DA AVG report only all year
002Mercury, total recoverable30DA AVG report only all year
002IsopropanolDAILY MX <= 1 mg/L all year
002Volatile fraction organics [EPA 624]DAILY MX <= 2 mg/L all year
002Chemical Oxygen Demand [COD]30DA AVG report only all year
002Pass/Fail Static 48Hr Acute Daphnia MagnaDAILY MX <= 0 pass=0;fail=1 Jan, Feb, Mar, Jul, Aug, Sep
002Pass/Fail Static 48Hr Acute Daphnia MagnaDAILY MX <= 0 pass=0;fail=1 Jan, Feb, Mar, Jul, Aug, Sep
002Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only Jan, Feb, Mar, Jul, Aug, Sep
002Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only Jan, Feb, Mar, Jul, Aug, Sep
002Pass/Fail Static Renewal 7Day Chronic Pimephales promelasDAILY MX <= 0 pass=0;fail=1 Apr, May, Jun, Oct, Nov, Dec
002Pass/Fail Static Renewal 7Day Chronic Pimephales promelasDAILY MX <= 0 pass=0;fail=1 Apr, May, Jun, Oct, Nov, Dec

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