South Carolina Code of Regulations › Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL › Subchapter 61-56 - ONSITE WASTEWATER SYSTEMS › Section 61-56.200 - Minimum Site Conditions for Onsite Wastewater Systems

Current through Register Vol. 48, No. 6, June 28, 2024
200.1. Soil texture, depth of soil to
			 restrictive horizons, and depth to the zone of saturation shall meet minimum
			 standards approved by the Department. These characteristics shall be determined
			 using accepted methodologies in the field of soil science.
200.2. Soils exhibiting massive or platy
			 structure, and soils which have been identified as having substantial amounts
			 of expansible layer clay minerals or smectites, are unsuitable for onsite
			 wastewater systems.
200.3. Where
			 the estimated peak sewage flow will not exceed fifteen hundred (1500) gpd, the
			 minimum vertical separation between the deepest point of effluent application
			 and the zone of saturation shall be at least six (6) inches.
200.4. Where the estimated peak sewage flow
			 will exceed fifteen hundred (1500) gpd, the depth to the zone of saturation
			 shall be at least thirty-six (36) inches below the naturally occurring soil
			 surface, and at least six (6) inches below the deepest point of effluent
			 application.
200.5. Depth to rock
			 and other restrictive horizons shall be greater than twelve (12) inches below
			 the deepest point of effluent application.
200.6. Setbacks.
(1) The area of the lot or plot of ground
			 where the onsite wastewater system is to be installed shall be of sufficient
			 size so that no part of the system, excluding solid pipes, will be:
(a) Within five (5) linear feet of a
			 building, or under a driveway or parking area;
(b) Within seventy-five (75) linear feet of a
			 private well;
(c) Within one
			 hundred (100) linear feet of a public well;
(d) Within seventy-five (75) linear feet of
			 the delineated critical area line (tidal waters of coastal waters and tidelands
			 critical areas) as determined by the Department's coastal division; or within
			 seventy-five (75) linear feet of the mean high water (within the banks)
			 elevation (nontidal waters, beach/dune systems and beach critical areas) of an
			 impounded or natural body of water, including streams, canals, and retention
			 ponds;
(e) Within ten (10) feet of
			 upslope and twenty-five (25) feet of downslope curtain drains;
(f) Within twenty-five (25) feet of a
			 drainage ditch or stormwater treatment system including any detention ponds
			 (determined by maximum water elevation);
(g) Within fifteen (15) feet of piped
			 drainage ditches;
(h) Within
			 fifteen (15) feet of an inground pool;
(i) Within twenty-five (25) feet upslope of a
			 basement; and within fifteen (15) feet of the sides of a basement, except that
			 if foundation drains are present and the elevation of the foundation drain is
			 at the same elevation or lower than the elevation of the trench bottom for the
			 subsurface wastewater infiltration area or repair area, then a twenty-five (25)
			 foot setback from the sides of a basement applies. These setbacks do not apply
			 to a septic tank/pump chamber location or where trench installations are
			 downslope of a basement;
(j) Within
			 fifteen (15) feet of the top of the slope of embankments or cuts of two (2)
			 feet or more vertical height when any part of the wastewater infiltration
			 trench is to be placed higher in elevation than the invert of the cut or
			 embankment;
(k) Within five (5)
			 feet of a property line.