This office has under consideration the application of:

Applicant: Winterthur Museum, Garden & Library
Location: 5105 Kennett Pike, Wilmington, DE 19735
Parcel(s): 0701200037

Project Description: Winterthur Museum, Garden & Library has applied for reissuance of its National Pollutant Discharge Elimination System (NPDES) Permit No. DE0021768 (State Number WPCC 3250I/74) to discharge treated sanitary wastewater, storm water, and groundwater to Wilson Run, a tributary of Brandywine Creek. This facility is located at 5105 Kennett Pike, Winterthur, New Castle County, Delaware. The treatment plant treats sanitary sewerage generated by the staff and visitors to the museum and gardens. It consists of a comminutor, two aerated flow equalization tanks with a combined working capacity of 13,700 gallons, two forward feed pumps, one aeration tank with a capacity of 25,000 gallons, one final clarifier, one filter feed pump, one pressure sand filter and an ultraviolet disinfection system.

Based on a preliminary staff review and application of lawful standards and regulations, the Department proposes to re-issue this permit, subject to certain effluent limitations and conditions. 

The application and other relevant information is posted at: dnrec.delaware.gov/dnrec-public-notices.

For questions regarding the application and plans, please contact:

DNREC Division of Water
Commercial and Government Services Section
89 Kings Highway
Dover, DE 19901
Commercial_Government_LegalNotice@delaware.gov
(302) 739-9948

A public hearing on the above applications will NOT be held unless the Secretary of DNREC determines that a public hearing is in the public interest or if a written meritorious objection to the application is received within 30 days from this notice, ending at 4:30 p.m. on September 11, 2026. A public hearing request shall be deemed meritorious if it exhibits a familiarity with the application and provides a reasoned statement of the action’s probable impact. 

Please submit all written comments and/or a meritorious request for a public hearing to the email address Commercial_Government_LegalNotice@delaware.gov.

Related Topics:  NPDES, permitting and regulation, public notice, surface water discharge, water