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Winterthur Museum

Museums And Art Galleries, Winterthur, Delaware. NPDES permit DE0021768 expired Jan 31, 2026; its limits still apply. Last 12 months: over a limit 3 times (last April 2026), 36 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (36 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
5 values over a limit, 36 required values missing, 2 of 12 reports late

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

Period endingParameterReportedLimitOver by
February 2026Enterococci: group D, MF trans, M-E, EIA, daily maximum> 2420 CFU/100mL≤ 185 CFU/100mL—
February 2026Enterococci: group D, MF trans, M-E, EIA, geometric mean> 7.01 CFU/100mL≤ 100 CFU/100mL—
April 2026Nitrogen, total [as N], daily average2.13 lb/d≤ 2.09 lb/d2%

Limits in force (44)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 23 mg/Lall year
BOD, 5-day, 20 deg. Cdaily average≤ 3.13 lb/dall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 4.7 lb/dall year
BOD, 5-day, 20 deg. Cdaily averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendeddaily average≤ 15 mg/Lall year
Solids, total suspendeddaily maximum≤ 23 mg/Lall year
Solids, total suspendeddaily average≤ 3.13 lb/dall year
Solids, total suspendeddaily maximum≤ 4.7 lb/dall year
Solids, total suspendeddaily averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendeddaily averagereport only (lb/d)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Nitrogen, total [as N]daily averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]daily average≤ 2.09 lb/dall year
Nitrogen, total [as N]daily maximum≤ 3.14 lb/dall year
Nitrogen, ammonia total [as N]daily averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily averagereport only (mg/L)May–Oct
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May–Oct
Nitrogen, ammonia total [as N]daily average≤ .939 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily average≤ .313 lb/dMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 1.41 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ .47 lb/dMay–Oct
Phosphorus, total [as P]daily averagereport only (mg/L)Apr–Oct
Phosphorus, total [as P]daily averagereport only (mg/L)Jan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]daily maximumreport only (mg/L)Apr–Oct
Phosphorus, total [as P]daily maximumreport only (mg/L)Jan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]daily average≤ .417 lb/dApr–Oct
Phosphorus, total [as P]daily average≤ .834 lb/dJan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]daily maximum≤ .626 lb/dApr–Oct
Phosphorus, total [as P]daily maximum≤ 1.252 lb/dJan, Feb, Mar, Nov, Dec
Enterococci: group D, MF trans, M-E, EIAgeometric mean≤ 100 CFU/100mLall year
Enterococci: group D, MF trans, M-E, EIAdaily maximum≤ 185 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
Chlorine, total residualdaily maximum≤ 0 mg/Lall year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/DE0021768 · MCP: https://passage-data.com/mcp