Pond & Retention Basin Excavation
in Wilmington, NC
Wilmington Elite Grading & Excavation has been excavating ponds and retention basins for Wilmington-area property owners and developers for over 20 years! Backyard pond excavation typically costs $300 to $3,200 depending on soil type and site accessibility, while stormwater retention basins on commercial sites run from a few thousand dollars for a small basin to well over $50,000 for larger detention systems required by local stormwater ordinances. Wilmington's heavy summer rainfall, which delivers nearly 40% of the year's total precipitation between July and September, makes properly sized retention and detention systems especially important for commercial developments here.
The type of retention or detention system a site needs is determined by drainage area, soil infiltration rate, and local stormwater ordinance requirements, not by preference, and undersized systems are a common cause of stormwater permit violations. Wilmington Elite Grading & Excavation excavates residential ponds, agricultural ponds, and engineered commercial retention basins scoped to each project's specific water volume and permitting requirements.
Why Choose Us
Local Land Grading
& Excavation Contractors
Wilmington Elite Grading & Excavation has completed grading and excavation work on more than 1,800 residential and commercial lots across the greater Wilmington region. Our crews understand New Hanover County's flood zone maps, Cape Fear River floodplain restrictions, and the sandy, well-drained soil common to coastal Southeastern North Carolina construction.
Advanced Grading Techniques
Our operators are trained on laser-guided grading systems, GPS machine control, and compaction testing equipment that verifies soil density meets 95% Proctor compaction standards before foundation work begins. Equipment operators complete manufacturer safety certification and OSHA 10-hour construction safety training.
Proven Track Record
More than 92% of customers who complete a project with us report they would use our services again for future site work, based on internal post-project surveys. Our completed project mix spans new home construction, commercial pad sites, septic system installs, drainage correction, pond excavation, and storm-damage debris removal following tropical storm activity.
Get a FREE On-Site Estimate
Pond & Retention Basin Excavation We Provide
Residential and Backyard Pond Excavation
We excavate backyard and garden ponds sized and shaped to a property owner's design, typically costing $300 to $3,200 for excavation alone depending on soil conditions and site access. Homes with a well-built pond can sell for measurably more than comparable properties without one, according to real estate market data. This service includes grading the surrounding area to prevent erosion into the finished pond.
Agricultural and Farm Pond Excavation
We excavate farm ponds used for livestock watering, irrigation, or general agricultural use, typically running $5,000 to $20,000 depending on size and depth. Larger agricultural ponds and small lakes are often priced per acre, with costs generally decreasing as excavated acreage increases. This service applies to rural properties throughout Pender, Brunswick, and New Hanover counties.
Stormwater Retention Basin Excavation
We excavate wet retention basins designed to hold a permanent pool of water that manages stormwater runoff and improves water quality before discharge. Wet retention excavation typically costs $0.50 to $1.00 per cubic foot, and most designs target an average pond depth of 3 to 6 feet per state stormwater design standards. This service is common on commercial developments required to manage runoff under local stormwater ordinances.
Dry Detention Basin Excavation
We excavate dry detention basins that temporarily store stormwater during a storm event and release it at a controlled rate, staying empty between rain events. Dry detention excavation typically costs around $0.30 per cubic foot, generally less than a comparable wet retention system, though it requires more land area to achieve the same storage volume. This service applies to commercial and multi-lot developments with available land for a basin footprint.
Pond and Basin Liner and Sealing Preparation
We prepare excavated pond and basin bottoms for sealing, compacting clay soil where present or coordinating installation of an engineered liner where natural soil won't hold water. Sealing costs vary significantly depending on whether existing clay soil can be compacted or an imported liner is required, and skipping this step on a site without natural clay is one of the most common reasons a newly excavated pond fails to hold water. This service ensures a finished pond or basin actually retains water as designed.
Types of Properties We Serve
Residential Properties
Homeowners adding a backyard pond or water feature need excavation scoped to their design plan and property's soil conditions. We grade the surrounding landscape to direct runoff appropriately once the pond is complete.
Agricultural and Rural Land
Rural property owners building a farm pond for livestock, irrigation, or general property use need excavation sized to their water needs and property's natural drainage. We assess soil type and water source availability before excavating agricultural ponds.
Commercial Developments
Commercial developers need retention or detention basins engineered to meet local stormwater ordinance requirements for a site's drainage area and impervious surface coverage. We coordinate basin excavation with civil engineers to ensure the finished basin meets permitted design specifications.
Some of Our Customer Reviews
"They excavated a beautiful pond in our backyard in Wilmington and it's held water perfectly through two rainy seasons."
— Diane K., Wilmington, NC
"Our farm pond in Hampstead came out exactly the size we needed for the cattle. Fair pricing and quick work."
— Gary S., Hampstead, NC
"The retention basin for our commercial site in Leland was excavated to spec and passed stormwater inspection without any issues."
— Commercial client, Leland, NC
Pond & Retention Basin Excavation FAQs
How much does it cost to excavate a backyard pond?
Backyard pond excavation typically costs $300 to $3,200 depending on soil type, pond size, and site accessibility.
What's the difference between a retention basin and a detention basin?
A retention basin holds a permanent pool of water, while a detention basin temporarily stores stormwater during a storm and stays dry between rain events.
Do I need a permit to excavate a pond on my property?
Permits are often required for ponds disturbing more than 5,000 square feet of land, and commercial retention or detention basins typically require stormwater permitting regardless of size.
How deep should a pond be?
Most stormwater retention ponds target an average depth of 3 to 6 feet, while backyard and farm ponds vary based on intended use and local conditions.
Can you excavate a pond that will hold water without an artificial liner?
In many cases yes, particularly where existing clay soil can be compacted to seal the pond bottom, though sites without suitable clay may need an imported liner.