Stormwater Permits

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City of Wilmington Comprehensive Stormwater Ordinance

The City of Wilmington is a National Pollution Discharge Elimination System (NPDES) Phase II community. Federal Law requires that the City of Wilmington implement a Stormwater Ordinance that includes Post Construction Controls. This permitting process is required by the Clean Water Act and applies to urbanizing areas.

The City of Wilmington’s Stormwater Ordinance that includes the NPDES Phase II Post Construction Controls was adopted by the Wilmington City Council effective on November 1, 2009. The City’s Comprehensive Stormwater Ordinance applies to all new development, redevelopment and expansion or modification of existing development. It regulates both water quality (pollution) and water quantity (volume) with regards to run-off generated by development activities. For many projects, it will replace the State Stormwater Permit process currently administered by the NCDEQ - Division of Energy, Mineral & Land Resources.  There are two tiers of Stormwater Review that may apply – Full Stormwater Review and Drainage Plan Review.  The document below will help determine which level of review applies to your project.

NC Session Law 2018-145 was passed by the legislature in December 2018.  The memo below outlines the impacts to the redevelopment and vegetated buffer portions of the City Stormwater Ordinance.  These changes are not reflected in the current version of the Comprehensive Stormwater Ordinance but will be included with the next update to the Land Development Code.  They are being enforced now to remain consistent with State requirements. 

Submittal and Review

All development review for the City of Wilmington is coordinated by City Planning staff as part of the Site Plan Review Process.  This involves a 3-tiered series of meetings and review submittals intended to step a project from concept through full approval and construction release.  The bulk of the technical review for a project is done as part of the 3rd and final tier - the Technical Review Committee (TRC) meeting.  Engineering and Stormwater review is a component of the overall Site Plan Review Process.  All plans, forms and other supporting documentation necessary for Engineering and Stormwater review are submitted through City planning– they are not submitted directly to Engineering.  Additional information on the City’s Site Plan Review Process can be obtained from the website below or you may contact any City Engineering for Planning staff member.

Stormwater Permit Forms

All projects that require a stormwater permit (Drainage Plan or Full Stormwater Permit) must complete submit a signed Stormwater Permit Application form.  A checklist of other submittal requirements, including calculations, forms and documents are listed on p5 of the application.  All required forms and documents must be submitted along with the appropriate plan review fee for a project to be considered for Engineering TRC review.

The Stormwater Permit Application Instructions must be read prior to completing the Stormwater Permit Application Form.

SCM Forms

All High-Density projects or projects proposing permeable pavements (for credit) are required to submit one (1) supplement for each proposed Stormwater Control Measure (SCM). One (1) operation and maintenance agreement shall be submitted for each type of SCM proposed.  The City of Wilmington is utilizing the State (NCDEQ) Supplement EZ form as the required SCM supplement.



Operation &
Maintenance Agreement


Revision 4

Disconnected Impervious Surface

Revision 1

Dry Extended Basin


Level Spreader/Filter Strip

Revision 4

Grass Swale

Revision 4

Infiltration Basin

Revision 4

Infiltration Trench

Revision 4

Permeable Pavements

Revision 4

Rainwater Harvesting

Revision 2

Green Roof

Revision 1

Sand Filter


Stormwater Wetland

Revision 6

Wet Detention Basin

Revision 6

Proprietary - Storm Filter

Revision 1


Deed Restriction Forms

Any subdivision (residential or commercial) or project where a portion of the property has the potential to be sold must submit one (1) proposed property restriction document with the application packet.  The proposed property restriction language is typically included in the master protective covenants for the subdivision and is required to be recorded prior to the sale of any lot.

Other Documents

Engineering Approval Stamps

TRC and Engineering Approval Stamps should be placed on each sheet in the plan set, preferably near the bottom right corner of each sheet.  The following files are in AutoCAD 2004 format:

Links to Other Agencies


Engineering (General Questions) 910.341.7807
Robert Gordon PE, Plan Review Engineer  910.341.5856
Richard Christensen PE, Project Engineer  910.341.7813
Eric Seidel PE, Project Engineer  910.765.7461 
Trent Butler PE,Staff Engineer  910.341.0094 

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