The Town of Mount Pleasant has developed a Stormwater Management Program in order to reduce the discharge of pollutants from the Town of Mount Pleasant’s Small Municipal Separate Storm Sewer System (SMS4) to the maximum extent practicable, to protect water quality and to satisfy the appropriate requirements of the Clean Water Act. The Town of Mount Pleasant is the permitting authority for all land disturbing activities and requires the land owner to maintain all on-site stormwater control facilities and all open space areas (e.g. parks or “green” areas) required by the approved stormwater control plan. The Town of Mount Pleasant will only provide construction permits to projects that establish a plan to manage stormwater runoff occurring during the construction process. Post-construction stormwater regulations will also be enforced, including regular inspections. Charleston County will handle the collection of stormwater fees within Mount Pleasant. The Town of Mount Pleasant, under the NPDES program, also has the authority to inspect properties for noncompliance and can issue a notice of violation (NOV) for any deficiency or infraction onsite.
The post construction stormwater management program is designed to give The Town of Mount Pleasant the authority to require structural and non-structural stormwater quality BMPs on sites being developed. The Town of Mount Pleasant currently provides design requirements to control stormwater discharges from new development and redeveloped sites and has established performance standards for addressing the first inch of runoff. The Town of Mount Pleasant will improve the post construction program by developing additional or revising existing site performance standards and ensuring post construction BMPs are inspected and maintained appropriately.
All structural stormwater control measures installed and implemented to meet the site performance standards will be maintained in perpetuity. The Town of Mount Pleasant will ensure the long-term maintenance of structural stormwater control measures installed.
The Town of Mount Pleasant will require that property owners or operators of any new development or redeveloped site subject to the site performance standards will provide verification of maintenance for the approved structural stormwater control measures used to comply with the performance standards.
To ensure that all stormwater control measures are operating correctly and are being maintained as required consistent with its applicable maintenance agreement, The Town of Mount Pleasant will conduct inspections of each project site permitted since the effective date of the SMS4 general permit, at least one time during the permit term.
The Town of Mount Pleasant will document its inspection findings in an inspection report. The Town of Mount Pleasant will document and maintain records of inspection findings and enforcement actions and make them available for review by the permitting authority.
As-builts are required for new projects to allow project engineers to review the built condition and confirm/ certify that the project was built according to their plans. The information is also used to manage the post-construction BMPs and infrastructure. DRAFT as-built submittal should be made well in advance of project closeout to allow for review, comment, and corrections. To expedite your process and approval, please follow the as-built checklist and submit the checklist form with your documents. Access the as-built checklist here.
All new projects that are reviewed and approved by the Town and are installing stormwater BMPs must submit a maintenance agreement to the Town. This agreement requires the site owner to inspect and maintain their BMPs to ensure optimal performance. Annual inspections of the system, detailing any maintenance required or undertaken, must be performed by a qualified engineer and reports sent to the Town.
**New November 2021 - The town will accept annual inspection reports from certified BMP Inspectors.
The Town will perform random site inspections to ensure owners are taking proper care of their systems. Maintenance required for each system will be dependent on the type of BMP implemented at your site.
Mount Pleasant Stormwater Management Plan