S.C. Code § 31-3-1080
The legislative delegation of each of the counties in the area of operation of the regional housing authority and the commissioners of the regional housing authority shall adopt a resolution declaring that there is a need for excluding a county or counties from such area if (a) each such legislative delegation of the counties to remain in the area of operation of the regional housing authority and the commissioners of the regional housing authority find that, because of facts arising or determined subsequent to the time when such area first included the county or counties to be excluded, the regional housing authority would be a more efficient or economical administrative unit to carry out the purposes of this chapter and Chapter 11 if such county or counties were excluded from such area and (b) the legislative delegation of each such county or counties to be excluded and the commissioners of the regional housing authority each also find that, because of the aforesaid changed facts, the purposes of this chapter and Chapter 11 could be carried out more effectively or economically in such county or counties if the area of operation of the regional housing authority did not include such county or counties.
In determining whether dwelling accommodations are unsafe or unsanitary the legislative delegation of a county shall take into consideration the safety and sanitation of dwellings, the light and air space available to the inhabitants of such dwellings, the degree of overcrowding, the size and arrangement of the rooms and the extent to which conditions exist in such dwellings which endanger life or property by fire or other causes.
S.C. Code § 31-3-1080