Environmental Rules in Mount Pleasant, SC (2026)
4 verified environmental rules for Mount Pleasant, South Carolina, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
The Town of Mount Pleasant requires a stormwater land-disturbing permit for most construction under Chapter 153: less than an acre of residential disturbance needs only a simplified plan, but disturbing more than one acre triggers the full drainage-plan requirements enforced through the town's NPDES program.
Mount Pleasant Stormwater Land Disturbance Permit
Some RestrictionsMount Pleasant Code of Ordinances § 153.040
(D) For residential land-disturbing activities involving less than one acre of actual land disturbance, which are not part of a larger common plan of development or sale, the property owner shall submit a simplified stormwater management control plan meeting the requirements listed in Chapter 155, Appendix B, § 13. ... (F) For land-disturbing activities disturbing more than one acre, all of the...
Erosion Control
In the Town of Mount Pleasant, any construction project covered by a drainage plan must have a Stormwater Pollution Prevention Plan (SWPPP) prepared by a licensed engineer that identifies erosion and sediment control measures. Those measures must stay in effective operating condition throughout construction, with site inspections at least every 7 or 14 days.
Erosion & Sediment Control, Mount Pleasant SC
Some RestrictionsMount Pleasant Code of Ordinances § 153.043(F)
(F) Maintenance of controls. (1) All erosion and sediment control measures and other protective measures identified in the SWPPP must be maintained in effective operating condition. If site inspections identify BMPs that are not operating effectively, maintenance must be performed as soon as practical or as reasonably possible, and before the next storm event whenever practicable, to maintain t...
Flood Zones
Anyone developing in a Mount Pleasant special flood hazard area needs a building permit before starting, under § 152.40. Applicants file scaled plans with the Building Official showing structure locations, elevations, and drainage under § 152.41, and must certify the as-built floor elevation once construction reaches the lowest floor.
Mount Pleasant Floodplain Development Permit
Some RestrictionsMount Pleasant Code of Ordinances §§ 152.40, 152.41
§ 152.40 PERMIT REQUIRED. ... A building permit shall be required in conformance with the provisions of this chapter prior to the commencement of any development activities. ... Application for a building permit shall be made to the Building Official on forms furnished by him or her prior to any development activities, and may include, but not be limited to, the following plans in duplicate dra...
Flood Elevation Requirements
Mount Pleasant sets its design flood elevation two feet above FEMA's base flood elevation under § 152.04, and § 152.22 requires new or substantially improved residential construction to elevate the lowest floor, including any basement, no lower than that design flood elevation.
Mount Pleasant Base Flood Elevation Freeboard
Some RestrictionsMount Pleasant Code of Ordinances §§ 152.04, 152.22
DESIGN FLOOD ELEVATION (DFE). The elevation of the base flood plus two feet at any given location in areas of special flood hazard. ... (A) Residential construction. New construction or substantial improvement of any residential building (or manufactured home) shall have the lowest floor, including basement, elevated no lower than the design flood elevation.
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County ordinances apply to unincorporated areas and may supplement Mount Pleasant city rules.
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