Environmental Rules in Darlington County, SC (2026)
4 rules for unincorporated Darlington County, South Carolina.
Verified from official government sources
Stormwater Management
Unincorporated Darlington County bans illicit discharges and illicit connections to its MS4 storm drain system under Appendix A, Article Seventeen. Any land disturbance of one acre or more needs a county-approved SWPPP before grading starts, and the Planning Department's director of planning enforces the article with inspections, corrective orders and misdemeanor fines up to $500 per day.
Darlington County MS4 Stormwater Rules
Some RestrictionsDarlington County Development Standards Ordinance, Appendix A §§ 17.4.3, 17.4.9
A.Darlington County prohibits illicit discharges and illicit connections, as defined in Section 17.3.A. of this article. ... C.A person is considered to be in violation of these regulations if the person connects a line conveying sewage to the MS4, or allows such a connection to continue. ... 7.Failure to comply with order. If the user fails to comply with an order to take corrective action fro...
Erosion Control
Developers in unincorporated Darlington County must stabilize graded slopes steeper than 4:1 with hydroseeding, sod, or hand-seeding and mulching under the county's drainage standards, with specific seed and fertilizer rates set by season.
Erosion Control Standards, Darlington County
Some RestrictionsDarlington County Development Standards Ordinance, Appendix A § 5.6(H)
(H)Erosion control. Whenever graded earthen slopes are steeper than 4:1 (4 horizontal to 1 vertical), and in other areas where erosion is deemed potentially damaging by the county, grass seed shall be planted by hydroseeding, placing sod mats or seeding by hand and mulching.(1)Hydroseeded grassing shall be performed using Method C (wood cellulose fiber tackifer) in accordance with S.C.D.H.P.T. ...
Flood Zones
Development Standards Ordinance § 3.4.1 requires a development permit before any construction in Darlington County's mapped special flood hazard areas, based on FEMA's March 25, 2025 flood insurance study, with violations a misdemeanor fined up to $500 a day.
Flood Hazard District Rules in Darlington County
Significant RestrictionsDarlington County Development Standards Ordinance, Appendix A § 3.4.1
(D)Lands to which section 3.4 applies. Section 3.4 shall apply to all areas of special flood hazard within the unincorporated areas of the county as identified by the Federal Emergency Management Agency in its flood insurance study, dated March 25, 2025, for the county with accompanying maps and other supporting data, which are hereby adopted by reference and declared to be a part of section 3....
Flood Elevation Requirements
In unincorporated Darlington County, new and substantially improved residential structures in a special flood hazard area must have their lowest floor built at least two feet above the base flood elevation, with no basements allowed under the Development Standards Ordinance.
Base Flood Elevation Rule, Darlington County
Some RestrictionsDarlington County Development Standards Ordinance, Appendix A § 3.4.4(B)(1)
(A)General standards. Development Services will review all permit applications to determine whether proposed building sites will be reasonably safe from flooding. ... (B)Specific standards. In all areas of special flood hazard where base flood elevation data has been provided, as set forth in section 3.4.1(D) or section 3.4.3(C)(9), the following provisions are required:(1)Residential construct...
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