Sediment and Stormwater

The DNREC Sediment and Stormwater Management Program operates within the Division of Watershed Stewardship’s Conservation Programs Section. The program employs a comprehensive approach to sediment control (both during and after construction) and stormwater management that includes monitoring of stormwater quantity and water quality control.

Notice: Owners and operators with one or more approved Notices of Intent (NOI) or Co-permittee NOIs must reauthorize under the 2026 Construction General Permit. This must be completed by June 15, 2026, to maintain coverage. To begin reauthorization, login to your eNOI System account.

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The Sediment and Stormwater Program was created by the Delaware General Assembly in 1978 (7 Del. Code, Chapter 40, Erosion and Sedimentation Control). It oversees activities governed by Delaware’s Sediment and Stormwater Regulations (7 DE Admin. Code 5101).

Program responsibilities include:

Sediment control and inspection during construction
Post-construction inspection of permanent stormwater facilities
Stormwater quantity and water quality control
Education/training relating to stormwater

For more information, please contact the Sediment and Stormwater Program at 302-608-5458.

Delegated Agencies

There are delegated agencies in all three Delaware counties, and in several municipalities who perform sediment and stormwater services including plan review, construction inspection, and maintenance inspection.

NPDES Construction General Permits

Delaware’s Regulations Governing the Control of Water Pollution provide for a general permit under the National Pollutant Discharge Elimination System (NPDES) for controlling stormwater discharges from construction sites.

For permit coverage, construction activities with land disturbing activities of 1 acre or more must submit a Notice of Intent (NOI) prior to plan approval and agree to comply with requirements outlined in the NPDES General Permit for Stormwater Discharges from Construction Activity, also known as the Delaware Construction General Permit or CGP. Permit coverage is required until conditions of terminating permit coverage are met.

General Permit and Regulations

Delaware Construction General Permit (Effective March 11, 2026)

Fact Sheet for the Delaware Construction General Permit

Special Conditions for Stormwater Discharges from Construction Activities (7 DE Admin. Code 7201 Part 2)

Electronic Notice of Intent (eNOI)

The eNOI System is an online tool to review, submit or manage NOIs or NPDES construction permits.

eNOI User Guide

List of Notices of Intent

Example Weekly Self Review Form

eNOI CGP Reauthorization Instructions

Regulatory Guidance Documents

Delaware Erosion and Sediment Control Handbook

The Erosion and Sediment Control Handbook provides background information on erosion and sedimentation, information on Delaware’s regulatory program and standards and specifications for erosion and sediment control. The standard details to be used on Sediment and Stormwater Plans are also available for download.

Post Construction Stormwater BMP Standards and Specifications

The Post Construction Stormwater BMP Standards and Specifications contains design guidelines, construction guidelines and maintenance recommendations for the various permanent Best Management Practices (BMPs) intended for both quality and quantity management of stormwater runoff.

Standard Guidelines for Operation and Maintenance of Stormwater BMPs

The Standard Guidelines for Operation and Maintenance of Stormwater BMPs summarizes the maintenance items and frequency from the Post Construction Stormwater BMP Standards and Specifications into a single document. Maintenance review checklists for a selection of those practices are also included.