Delaware's Conservation District Delegation for Stormwater Review

Delaware runs its sediment and stormwater program through a state-delegation model that differs from how PA, MD, or VA handle the same work. DNREC holds statewide authority under Title 7, Chapter 40 of the Delaware Code and 7 DE Admin. Code 5101, but plan review and day-to-day administration are delegated to the three County Conservation Districts — Kent, New Castle, Sussex — plus City of Wilmington and City of Dover for their respective jurisdictions. Understanding which entity reviews which project, and how the districts operate in practice, is essential for planning a DE site project schedule.

Delaware rural farm landscape with construction site and erosion control measures at golden hour, photorealistic, warm cinematic lighting, conservation district aesthetic

The statewide framework

DNREC's Sediment and Stormwater Program sets the statewide standards:

Statutory basis. 7 Del. C. Ch. 40 — the Erosion and Sediment Control and Stormwater Management statute.
Regulation. 7 DE Admin. Code 5101 — the implementing regulations.
Technical standards. Delaware Erosion and Sediment Control Handbook (updated July 2023 — plans submitted after July 1, 2023 must use the updated standard details) and Delaware Sediment and Stormwater Regulations.
Program delegation. DNREC delegates plan review, inspections, and program administration to Conservation Districts and approved cities; DNREC retains program oversight and reviews delegated programs at least every 3 years.

Primary source: dnrec.delaware.gov/watershed-stewardship/sediment-stormwater.

Who reviews which project

Jurisdiction depends on project location:

New Castle County (outside City of Wilmington). New Castle County and the New Castle Conservation District handle plan review; New Castle County Department of Land Use Engineering Division implements ESC/stormwater review, with NCCD providing technical support.
Kent County (outside City of Dover). Kent Conservation District handles plan review.
Sussex County. Sussex Conservation District handles plan review for the entire county.
City of Wilmington. City runs its own approved stormwater program; submissions go through city channels. See our Wilmington Multi-Department essay for the broader city permit context.
City of Dover. City also runs its own approved program separate from Kent Conservation District review. See our Dover Dual City-County essay for Dover's overall permit structure.

For a given site, a contractor or designer confirms jurisdiction by location first. Projects at the City of Wilmington / New Castle County boundary, or at City of Dover / Kent County boundary, sometimes require coordination confirmation.

How the Conservation Districts operate

Kent Conservation District

Kent publishes a review-policy document with specific commitments. Features of its process:

Preliminary review option. Designers can submit hydrologic computations and design concepts for early review before full plan submission — catches issues upstream.
30-day turnaround target. Full review completed within 30 calendar days of a complete application.
Outside consultant review when district staffing requires it, followed by verification review by district staff.
Fair, consistent review against state regulations as the stated standard.

Primary source: kentcd.org (policy documents and submission guidance).

New Castle Conservation District / New Castle County Engineering

New Castle County's Department of Land Use Engineering Division is the primary reviewing entity for sites outside City of Wilmington. NCCD provides technical support. Key features:

Updated standard details required for plans submitted July 1, 2023 onward (Delaware Erosion Handbook, July 2023 edition).
Focus on stormwater BMPs for both construction-period and post-construction water quality and quantity management.
Integration with New Castle County land use permitting. Site stormwater plan review is part of the broader site plan and building permit process through the county.

Primary source: newcastlede.gov (Land Use / Plan Review).

Sussex Conservation District

Sussex Conservation District handles all of Sussex County's rural and suburban stormwater plan review. The district works with Sussex County's land use processes. Verify current procedural details at sussexcd.org.

What varies in practice

While all three districts and both cities operate under the same statewide standards, practical variation shows up in:

Staffing levels and queue depth. Districts with deeper staffing turn reviews faster in peak season. Kent's published 30-day target is explicit; others may vary.
Preliminary review practice. Kent promotes pre-submission conceptual review. Not all districts formally do.
Pre-submission meeting availability. Often yes on request; explicit formalization varies.
Comment specificity. Review comment depth and specificity varies with reviewer experience and workload.
Project type specialization. Kent sees a particular mix of residential subdivisions and agricultural sites; New Castle sees more commercial and industrial; Sussex sees significant coastal and agricultural work. Reviewers develop pattern recognition for their mix.
BMP preference patterns. What one district readily accepts, another may push back on. Not regulatory difference; reviewer familiarity difference.

The practical implication: a standardized design submitted unchanged across all three districts may land differently in each. Designers working in more than one county benefit from district-specific familiarity.

Wilmington and Dover: city-run programs

Both cities run DNREC-approved stormwater programs that take the place of county Conservation District review for projects within city limits:

City of Wilmington. Program integrated with the city's overall permit process. Department of Public Works is the primary reviewing entity for ROW-affecting work and stormwater-adjacent concerns; Land Use & Planning coordinates overall permit packet. See our Wilmington Multi-Department essay.
City of Dover. City engineering/public works handles stormwater in-city. Kent Conservation District does not review Dover projects within city limits.

For projects at city/county boundaries or annexation-adjacent, confirm reviewing authority early.

How DE's delegation model compares to neighbors

Pennsylvania. Delegates to 66 county conservation districts for NPDES construction permit coverage. Similar model to DE but scaled much larger. See our PA PAG-02 vs Individual essay.
Maryland. MDE delegates to counties and municipalities for stormwater program implementation; delegation is more city/county focused than district focused. See our MD New vs Redevelopment essay.
New Jersey. NJDEP administers statewide with limited delegation. Stormwater rule under N.J.A.C. 7:8.
Virginia. DEQ administers VSMP with local VSMP authority delegation (often localities, sometimes DEQ-direct). See our VA VSMP essay.
Delaware. Conservation District delegation + approved cities is the distinctive structure.

What to do with this

If you're starting a DE site project: confirm which entity reviews — county conservation district, or city program — based on site location.

If you're working in Kent County: use the preliminary review option. Cheap, fast, catches problems early.

If you're designing across multiple DE counties: invest in district-specific familiarity rather than a single standardized design. Reviewer expectations vary even when the underlying standards don't.

If you're at a city/county boundary: verify reviewing authority in writing before investing in plan prep.

For the full DE stormwater framework, see our Delaware Stormwater Navigator. For cross-state comparison, see Mid-Atlantic Stormwater Compared.

About The Hive

The Hive builds tools and publishes essays for working construction and MEP professionals in the Delaware Valley and Mid-Atlantic. Primary-source-grounded, practitioner-voiced, free to use.

DE Stormwater Navigator Mid-Atlantic Stormwater PA PAG-02 vs Individual VA VSMP General vs Individual MD New vs Redevelopment