City of Wilmington Regional WWTP

NPDES permit DE0020320 · Major POTW · expired, expires 2019-09-30 · 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.

This permit expired on 2019-09-30 and is expired: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

0values over a limit
0required values missing, on 0 form(s)
0of 10 forms filed late

Last period with anything received: 2026-06-30.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among DE permits in EPA's filings — check your permit).

Limits in force (48)

OutfallParameterStatisticLimitMonths
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedDAILY AV <= 20 mg/L all year
001Solids, total suspendedDAILY MX <= 40 mg/L all year
001Solids, total suspendedDAILY AV <= 22334 lb/d all year
001Solids, total suspendedDAILY MX <= 44668 lb/d all year
001Cadmium, total [as Cd]DAILY AV <= 4 ug/L all year
001Cadmium, total [as Cd]DAILY MX <= 8 ug/L all year
001Cadmium, total [as Cd]DAILY AV <= 4.4 lb/d all year
001Cadmium, total [as Cd]DAILY MX <= 8.8 lb/d all year
001Chromium, total [as Cr]DAILY AV <= 150 ug/L all year
001Chromium, total [as Cr]DAILY MX <= 220 ug/L all year
001Chromium, total [as Cr]DAILY AV <= 168 lb/d all year
001Chromium, total [as Cr]DAILY MX <= 252 lb/d all year
001Copper, total [as Cu]DAILY AV <= 23 ug/L all year
001Copper, total [as Cu]DAILY MX <= 38 ug/L all year
001Copper, total [as Cu]DAILY AV <= 25.2 lb/d all year
001Copper, total [as Cu]DAILY MX <= 42.1 lb/d all year
001Lead, total [as Pb]DAILY AV <= 49 ug/L all year
001Lead, total [as Pb]DAILY MX <= 123 ug/L all year
001Lead, total [as Pb]DAILY AV <= 54.7 lb/d all year
001Lead, total [as Pb]DAILY MX <= 138 lb/d all year
001Zinc, total [as Zn]DAILY AV <= 153 ug/L all year
001Zinc, total [as Zn]DAILY MX <= 257 ug/L all year
001Zinc, total [as Zn]DAILY AV <= 171 lb/d all year
001Zinc, total [as Zn]DAILY MX <= 287 lb/d all year
001Selenium, total [as Se]DAILY AV <= 20 ug/L all year
001Selenium, total [as Se]DAILY MX <= 60 ug/L all year
001Selenium, total [as Se]DAILY AV <= 24 lb/d all year
001Selenium, total [as Se]DAILY MX <= 65 lb/d all year
001Enterococci: group D, MF trans, M-E, EIADAILY AV <= 35 #/100mL all year
001Enterococci: group D, MF trans, M-E, EIADAILY MX <= 104 #/100mL all year
001Flow, in conduit or thru treatment plantDAILY AV report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualDAILY MN >= .1 mg/L all year
001Chlorine, total residualDAILY MX <= 4 mg/L all year
001Mercury, total [as Hg]DAILY AV <= .4 ug/L all year
001Mercury, total [as Hg]DAILY MX <= .6 ug/L all year
001Mercury, total [as Hg]DAILY AV <= .48 lb/d all year
001Mercury, total [as Hg]DAILY MX <= .64 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 17 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 34 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV <= 19080 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 38160 lb/d all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV report only all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]DAILY AV report only all year
001BOD, carbonaceous [5 day, 20 C]DAILY 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