Delaware’s stormwater requirements are shaped by DNREC program rules plus county and municipal MS4 and land development standards—especially active in New Castle County and the Wilmington urban area.
Where to Start (Official)
- DNREC — Stormwater for statewide construction, industrial, and municipal program information.
- Your county or city stormwater office for local maintenance standards, credits, and inspection expectations.
- New Castle County — Stormwater Management for northern Delaware program entry points.
What Property Teams Typically Maintain
- BMPs tied to recorded agreements: ponds, filters, underground treatment, and infiltration practices.
- Industrial controls and sampling plans where NPDES or state industrial permits apply.
- Documentation for MS4-covered properties subject to periodic inspection.
Disclaimer
Delaware Stormwater is not a government agency and does not interpret regulations on behalf of DNREC or any county. This page is for orientation only; rely on official sources for binding requirements.
