Passage Data · Check a report · Use it from your AI

City of Wilmington Regional WWTP

Sewage treatment plant, major discharger, Wilmington, Delaware. NPDES permit DE0020320 expired Sep 30, 2019; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (48 values)
Last report on file
July 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (48)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 20 mg/Lall year
Solids, total suspendeddaily maximum≤ 40 mg/Lall year
Solids, total suspendeddaily average≤ 22334 lb/dall year
Solids, total suspendeddaily maximum≤ 44668 lb/dall year
Cadmium, total [as Cd]daily average≤ 4 ug/Lall year
Cadmium, total [as Cd]daily maximum≤ 8 ug/Lall year
Cadmium, total [as Cd]daily average≤ 4.4 lb/dall year
Cadmium, total [as Cd]daily maximum≤ 8.8 lb/dall year
Chromium, total [as Cr]daily average≤ 150 ug/Lall year
Chromium, total [as Cr]daily maximum≤ 220 ug/Lall year
Chromium, total [as Cr]daily average≤ 168 lb/dall year
Chromium, total [as Cr]daily maximum≤ 252 lb/dall year
Copper, total [as Cu]daily average≤ 23 ug/Lall year
Copper, total [as Cu]daily maximum≤ 38 ug/Lall year
Copper, total [as Cu]daily average≤ 25.2 lb/dall year
Copper, total [as Cu]daily maximum≤ 42.1 lb/dall year
Lead, total [as Pb]daily average≤ 49 ug/Lall year
Lead, total [as Pb]daily maximum≤ 123 ug/Lall year
Lead, total [as Pb]daily average≤ 54.7 lb/dall year
Lead, total [as Pb]daily maximum≤ 138 lb/dall year
Zinc, total [as Zn]daily average≤ 153 ug/Lall year
Zinc, total [as Zn]daily maximum≤ 257 ug/Lall year
Zinc, total [as Zn]daily average≤ 171 lb/dall year
Zinc, total [as Zn]daily maximum≤ 287 lb/dall year
Selenium, total [as Se]daily average≤ 20 ug/Lall year
Selenium, total [as Se]daily maximum≤ 60 ug/Lall year
Selenium, total [as Se]daily average≤ 24 lb/dall year
Selenium, total [as Se]daily maximum≤ 65 lb/dall year
Enterococci: group D, MF trans, M-E, EIAdaily average≤ 35 #/100mLall year
Enterococci: group D, MF trans, M-E, EIAdaily maximum≤ 104 #/100mLall year
Flow, in conduit or thru treatment plantdaily averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily minimum≥ .1 mg/Lall year
Chlorine, total residualdaily maximum≤ 4 mg/Lall year
Mercury, total [as Hg]daily average≤ .4 ug/Lall year
Mercury, total [as Hg]daily maximum≤ .6 ug/Lall year
Mercury, total [as Hg]daily average≤ .48 lb/dall year
Mercury, total [as Hg]daily maximum≤ .64 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 17 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 34 mg/Lall year
BOD, carbonaceous [5 day, 20 C]daily average≤ 19080 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 38160 lb/dall year
BOD, carbonaceous [5 day, 20 C]daily averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]daily averagereport only (lb/d)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (lb/d)all year

How strict are these limits?

Cited limits by parameter: Delaware's rules and the federal ones.

Check this month's numbers Email me before each report is due

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/DE0020320 · MCP: https://passage-data.com/mcp