North Carolina Administrative Code › Title 15A - Environmental Quality › Chapter 18 - ENVIRONMENTAL HEALTH › Subchapter A - SANITATION › Section .1900 - SEWAGE TREATMENT AND DISPOSAL SYSTEMS › Section 18A .1950 - LOCATION OF SANITARY SEWAGE SYSTEMS

Current through Register Vol. 39, No. 2, July 15, 2024
(a) Every
				  sanitary sewage treatment and disposal system shall be located at least the
				  minimum horizontal distance from the following:
(1)
Any private water supply source, including any well
								or spring
100 feet;
(2)
Any public water supply source
100 feet;
(3)
Streams classified as WS-I
100 feet;
(4)
Waters classified as S.A.
100 feet, from mean high water mark;
(5)
Other coastal waters
50 feet, from mean high water mark;
(6)
Any other stream, canal, marsh, or other surface
								waters
50 feet;
(7)
Any Class I or Class II reservoir
100 feet, from normal pool elevation;
(8)
Any permanent storm water retention
								pond
50 feet, from flood pool elevation;
(9)
Any other lake or pond
50 feet, from normal pool elevation;
(10)
Any building foundation
5 feet;
(11)
Any basement
15 feet;
(12)
Any property line
10 feet;
(13)
Top of slope of embankments or cuts of 2 feet or
								more vertical height
15 feet;
(14)
Any water line
10 feet;
(15)
Drainage Systems:
(A) Interceptor drains, foundation drains, and
								storm water diversions
(i) upslope
10 feet,
(ii) sideslope
15 feet, and
(iii) downslope
25 feet;
(B) Groundwater lowering ditches and
								devices
25 feet;
(16)
Any swimming pool
15 feet;
(17)
Any other nitrification field (except repair
								area)
20 feet;
(b)
Ground absorption sewage treatment and disposal systems
					 may be located closer than 100 feet from a private water supply, except springs
					 and uncased wells located downslope and used as a source of drinking water, for
					 repairs, space limitations, and other site-planning considerations but shall be
					 located the maximum feasible distance and in no case less than 50
					 feet.
(c)
Nitrification fields and repair areas shall not be located
					 under paved areas or areas subject to vehicular traffic. If effluent is to be
					 conveyed under areas subject to vehicular traffic, ductile iron or its
					 equivalent pipe shall be used. However, pipe specified in Rule .1955 (e) may be
					 used if a minimum of 30 inches of compacted cover is provided over the
					 pipe.
(d)
In addition to the requirements of Paragraph (a) of this
					 Rule, sites to be used for subsurface disposal for design units with flows over
					 3,000 gallons per day, as determined in Rule .1949 (a) or (b) of this Section,
					 which include one or more nitrification fields with individual capacities of
					 greater than 1,500 gallons per day, shall be located at least the minimum
					 horizontal distance from the following:
(1)
Any Class I or II reservoir or any public water
								supply source utilizing a shallow (under 50 feet) groundwater
								aquifer
500 feet;
(2)
Any other public water supply source, unless
								determined to utilize a confined aquifer
200 feet;
(3)
Any private water supply source, unless determined
								to utilize a confined aquifer
100 feet;
(4)
Waters classified as SA
200 feet, from mean high water mark;
(5)
Any waters classified as WS-I
200 feet;
(6)
Any surface waters classified as WS-II, WS-III, B,
								or SB
100 feet; and
(7)
Any property line
25 feet.
(e)
				  Collection sewers, force mains, and supply lines shall be located at least the
				  minimum horizontal distance from the following:
(1)
Any public water supply source, including wells,
								springs, and Class I or Class II reservoirs
100 feet, unless constructed of leakproof pipe,
								such as ductile iron pipe with mechanical joints equivalent to water main
								standards, in which case the minimum setback may be reduced to 50
								feet;
(2)
Any private water supply source, including wells
								and springs
50 feet, unless constructed of similar leakproof
								pipe, such as ductile iron pipe with mechanical joints equivalent to water main
								standards, in which case the minimum setback may be reduced to 25
								feet;
(3)
Any waters classified as WS-I, WS-II, WS-III, B,
								SA, or SB
50 feet, unless constructed of similar leakproof
								pipe, such as ductile iron pipe with mechanical joints equivalent to water main
								standards, in which case the minimum setback may be reduced to 10
								feet;
(4)
Any other stream, canal, marsh, coastal waters,
								lakes and other impoundments, or other surface waters
10 feet;
(5)
Any basement
10 feet;
(6)
Any property line
5 feet;
(7)
Top of slope of embankments or cuts of two feet or
								more vertical height
10 feet;
(8)
Drainage Systems:
(A) Interceptor drains, storm drains, and storm
								water diversions
5 feet.
(B) Ground-water lowering ditches and
								devices
10 feet;
(9)
Any swimming pool
10 feet;
(10)
Any other nitrification field
5 feet.
(f)
				  Sewer lines may cross a water line if 18 inches clear separation distance is
				  maintained, with the sewer line passing under the water line. When conditions
				  prevent an 18-inch clear separation from being maintained or whenever it is
				  necessary for the water line to cross under the sewer, the sewer line shall be
				  constructed of ductile iron pipe or its equivalent and the water line shall be
				  constructed of ferrous materials equivalent to water main standards for a
				  distance of at least ten feet on each side of the point of crossing, with full
				  sections of pipe centered at the point of crossing.
(g) Sewer lines may cross a storm drain if:
(1) 12 inches clear separation distance is
				  maintained; or
(2) the sewer is of
				  ductile iron pipe or encased in concrete or ductile iron pipe for at least five
				  feet on either side of the crossing.