Permits guide
Delaware Sediment and Stormwater Rules for Land Clearing
Delaware runs one state program, delivered locally by delegated agencies. Which office reviews your plan depends on the county and municipality.
Delaware's Sediment and Stormwater Regulations exempt disturbance under 5,000 square feet and otherwise require an approved plan from DNREC or a delegated agency. Disturbance of 1 acre or more also needs a Notice of Intent for the construction general permit. Commercial forest harvesting that meets Department of Agriculture requirements is listed as exempt.
Last checked: October 2026
The state program and who delivers it
DNREC's Sediment and Stormwater Management Program operates within the Division of Watershed Stewardship. DNREC states it was created by the Delaware General Assembly in 1978 under 7 Del. Code, Chapter 40, and that it oversees activities governed by the Sediment and Stormwater Regulations, 7 DE Admin. Code 5101. Its responsibilities include sediment control and inspection during construction and post-construction inspection of permanent stormwater facilities.
The regulations state the general rule in section 1.3.1: unless a particular activity is exempted, a person shall not disturb land without an approved Sediment and Stormwater Management Plan from the Department or a Delegated Agency. DNREC says delegated agencies exist in all three Delaware counties and in several municipalities, and that they perform plan review, construction inspection and maintenance inspection.
Who reviews in New Castle County and Sussex County
| Area | Delegated agency |
|---|---|
| Unincorporated New Castle County | New Castle County Department of Land Use |
| Incorporated New Castle County, except Newark, Wilmington and Middletown | New Castle Conservation District |
| City of Newark, City of Wilmington, Town of Middletown | The city or town itself, as listed by DNREC |
| Sussex County | Sussex Conservation District |
The Sussex Conservation District states it has served as the delegated agency since 1991 and that projects disturbing 5,000 square feet or more are required to have a sediment and stormwater plan. The New Castle Conservation District states it reviews and inspects construction projects disturbing more than 5,000 square feet within the municipalities it covers. The wording differs slightly between the two districts, so ask your reviewing office which edge applies to a project at exactly 5,000 square feet.
Thresholds and exemptions in the regulation
Section 1.4 of the regulations lists activities exempt from both sediment control and stormwater management requirements. Subsection 1.4.1 covers agricultural land management practices that have a soil and water conservation plan, subject to conditions. Subsection 1.4.2 covers developments or construction that disturb less than 5,000 square feet, and adds that individual disturbances of less than 5,000 square feet that accumulate to exceed 5,000 square feet are not exempt and may be subject to the regulations as determined by the Department or Delegated Agency case by case.
Subsection 1.4.3 covers, with written agreement of the Department, land development activities regulated for erosion and sediment control under other specific State or Federal laws. Subsection 1.4.4 covers commercial forest harvesting operations that meet the requirements of the Department of Agriculture under 3 Del. Code, Chapter 10, Subchapter VI.
That last line is the one landowners ask about most. We read it as written and do not extend it. Whether a particular land clearing or forestry mulching job qualifies as a commercial forest harvesting operation meeting the Department of Agriculture requirements is for DNREC, the delegated agency and the Department of Agriculture to answer, so confirm with the reviewing agency before relying on it.
The 1 acre construction general permit
DNREC states that construction activities with land disturbing activities of 1 acre or more must submit a Notice of Intent before plan approval and agree to comply with the NPDES General Permit for Stormwater Discharges from Construction Activity, also called the Delaware Construction General Permit. DNREC lists the current general permit as effective March 11, 2026, and an online eNOI system for submitting and managing notices. Permit coverage is required until the conditions for terminating coverage are met.
DNREC describes two pieces for a project at that size: the plan with the reviewing agency and the Notice of Intent for the general permit. Ask the reviewing office to confirm the order of steps.
What this means for clearing in Delaware
- Small clearing under 5,000 square feet is exempt under section 1.4.2, but accumulating separate small disturbances can lose that exemption.
- Clearing of 5,000 square feet or more generally needs an approved plan before land is disturbed, unless another exemption applies.
- Clearing of 1 acre or more also needs a Notice of Intent for the construction general permit.
- The commercial forest harvesting exemption is narrow in wording and tied to the Department of Agriculture, so verify it in writing for the specific job.
- Wetlands, tidal areas and ditches can bring other approvals. Ask the reviewing agency which apply.
Our Sussex County page describes the coastal side of our work.
Before a site walk
Have the parcel number, the municipality, a sketch of the area to be cleared with square footage, notes on any ditch, pond or marsh edge, and a plain description of the method. Ask the reviewing agency whether it treats a mulching job without grading as land disturbing activity, and whether the forest harvesting exemption could apply. Keep the reply with the job file. We schedule only after the owner has the answer in writing.
Questions about this page
Sources: DNREC Sediment and Stormwater Program, DNREC, Delegated Agencies, 7 DE Admin. Code 5101, Sediment and Stormwater Regulations, New Castle Conservation District, Sediment and Stormwater, Sussex Conservation District, Design and Permitting. This is general information, confirm with the township or agency.
Is clearing under 5,000 square feet exempt in Delaware?
Section 1.4.2 of the Sediment and Stormwater Regulations exempts developments or construction that disturb less than 5,000 square feet. It adds that separate small disturbances that accumulate to exceed 5,000 square feet are not exempt and may be subject to the regulations case by case.
Who reviews sediment and stormwater plans in New Castle County and Sussex County?
DNREC lists the New Castle County Department of Land Use for unincorporated New Castle County, the New Castle Conservation District for most incorporated areas there, and the Sussex Conservation District for Sussex County.
When is a Notice of Intent needed in Delaware?
DNREC states that construction activities with land disturbing activities of 1 acre or more must submit a Notice of Intent before plan approval and comply with the Delaware Construction General Permit.
Is forest harvesting exempt in Delaware?
Section 1.4.4 exempts commercial forest harvesting operations that meet the requirements of the Department of Agriculture under 3 Del. Code, Chapter 10, Subchapter VI. Whether a given clearing job qualifies is for the agencies to say, so confirm before relying on it.
Call, or send the details.
(484) 486-7272hello@huntlyland.com. Send the town, rough acreage and two or three photographs. We reply with site-walk times, and a written plan follows the walk.
Delaware & coastal line: (302) 497-5263 · Main line: (484) 486-7272
Office hours Monday to Saturday, 8 a.m. to 4 p.m. On call 24/7 for storm and emergency cleanup. If anyone is in danger, call 911 first.