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Delaware City Wastewater Treatment Plant

Sewage treatment plant, New Castle, Delaware. NPDES permit DE0021555, in force until Jul 31, 2027. Last 12 months: over a limit once (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (17 values)
Renewal application due
Feb 1, 2027 · 180 days before expiry; your permit may set another date
Last report on file
July 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
April 2026Enterococci: group D, MF trans, M-E, EIA, daily maximum2419.6 CFU/100mL≤ 104 CFU/100mL2227%

Limits in force (17)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cdaily average≤ 12 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 22 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 55 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 105 lb/dall year
BOD, 5-day, 20 deg. Cdaily averagereport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 14 mg/Lall year
Solids, total suspendeddaily maximum≤ 21 mg/Lall year
Solids, total suspendeddaily average≤ 69 lb/dall year
Solids, total suspendeddaily maximum≤ 105 lb/dall year
Solids, total suspendeddaily averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily average≤ 35 mg/Lall year
Enterococci: group D, MF trans, M-E, EIAdaily average≤ 35 CFU/100mLall year
Enterococci: group D, MF trans, M-E, EIAdaily maximum≤ 104 CFU/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

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/DE0021555 · MCP: https://passage-data.com/mcp