Delaware Stormwater-General regulations & environmental compliance analysis

Delaware Stormwater-General: What you need to know

Governing Law and Regulations

Stormwater regulations for industrial activities: 7 Delaware Regulations (Del. Reg.) 7201.9.1

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Stormwater regulations for construction activities: 7 Del. Reg. 7201.9.2

Stormwater regulations for municipal separate storm sewer systems (MS4s): 7 Del. Reg. 7201.9.1

Regulatory Agencies

Delaware Department of Natural Resources and Environmental Control (DNREC) Division of Water

DNREC Division of Watershed Stewardship (DWS) Sediment and Stormwater Management Program

U.S. Environmental Protection Agency (EPA) Region 3

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Delaware is fully authorized to administer the National Pollutant Discharge Elimination System (NPDES) permit program for stormwater discharges. The state issues individual permits and general permits for industrial facilities and construction activities, and individual permits for municipal separate storm sewer systems (MS4s). See the state sections STORMWATER— INDUSTRIAL FACILITIES, STORMWATER— CONSTRUCTION ACTIVITIES, and STORMWATER—MUNICIPALITIES for information on state requirements for specific discharges. See the national section STORMWATER—GENERAL for more information on the federal stormwater program.

Delaware rules are more stringent because a NPDES permit is required to discharge any pollutant from a point source not only to surface waters but also to groundwater. For additional guidance, see the state section NPDES PERMIT.

Administration and enforcement. DNREC's NPDES stormwater regulations are administered and enforced by DNREC's Division of Water. DNREC's sediment and ...


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