§ 38-107. New homes served by a septic tank/drain field system.

(a)

New homes served by a septic tank/drain field system shall be on lots having minimum size limitations as follows, based on application of Table MT-1 of the DHR Manual (hereinafter DHR Table MT-1). The minimum set forth in Table MT-1 may be increased further based on consideration of other factors (set forth in sections of A—F) of the DHR Manual (110 percent of the subdivision minimum lot size calculated based on application of DHR Table MT-1 if they are within a low pollution susceptibility area as defined by the Hydrologic Atlas Number 20).

(b)

New mobile home parks served by septic tank/drain field systems shall have lots or spaces having minimum lot size limitations as follows, based on application of Table MT-2 of the DHR Manual (hereinafter DHR Table MT-2). The minimum set forth in Table MT-2 may be increased further based on consideration of other factors (set forth in sections of A-F) of the DHR Manual (110 percent of the subdivision minimum lot size calculated based on application of DHR Table MT-1 if they are within a low pollution susceptibility area as defined by the Hydrologic Atlas Number 20).

TABLE MT-1
MINIMUM LOT SIZES, MINIMUM LOT WIDTHS
AND MAXIMUM ALLOWABLE SEWAGE FLOW
FOR THE TYPE OF WATER SUPPLY SYSTEM

	Type of Water Supply System
	Nonpublic (Individual)	Public
Minimum lot size	43,560 square feet	21,780 square feet
Minimum lot width	150 feet	100 feet
Maximum sewage flow	600 gpad	1,200 gpad

 

Source: DHR Manual for On-Site Sewerage Management Systems

"Nonpublic" means an individual water supply system or any other water supply system which is not a "public" water supply system.

"GPAD" means gallons per acre per day or gallons/acre/day.

(1)

The minimum lot sizes in Table MT-1 are for the typical size home (three or four bedroom) with basic appurtenances such as: driveway, minimum number of trees, and water supply line. If larger homes, swimming pools, tennis courts or outbuildings, etc., are proposed to be constructed or if trees would interfere with installation of an on-site sewage management system, the county health department will require larger lots to assure useable soil area.

(2)

The county health department may also require larger lot sizes when physical factors indicate the need to do so. These factors include, but are not limited to, the availability of sufficient unobstructed land areas for an approved on-site sewage management system and approved replacement system, slope greater than five percent, percolation rates higher than 45 minutes per inch, need for subsurface drainage or adverse topographic features.

(3)

Lots shall be a minimum of 100 feet or 150 feet measured within the area where an approved on-site sewage management system and replacement system are to be located when served by a public water supply system or nonpublic water supply system, respectively.

(4)

The following land areas are not considered as a part of a lot when calculating the required minimum lot size: rights-of-way or roads, easements (such as power line or pipeline) that exclude installation of an on-site sewage management system, bodies of water, land within 50 feet of a lake, river, stream, wetland or other bodies of water and similar limiting factors.

(5)

There must be an unobstructed area on each lot for installation of an approved on-site sewage management system and an area equal in size for a conventional system or larger area, as appropriate, for an approved replacement system; this will include sufficient area for necessary site modifications for installation of both the initial system and a replacement system. All pertinent zoning setbacks and other space requirements must also be met.

(6)

The maximum daily sewage flow for each lot or parcel of land shall not exceed 600 gpad when served by nonpublic or individual water supply system or 1,200 gpad when served by public water system. When sewage flows exceed these quantities (600 or 1,200 gpad as indicated) for a given dwelling structure, the minimum lot size or parcel of land shall be increased proportionally. Example: Assume a public water supply exists (1,200 gpad maximum sewage flow allowed per minimum required land area of 21,780 square feet), and there is a proposed sewage flow of 5,000 gpd. To determine X = the square footage of the lot needed, use the following formula:

X	=	5,000 gal/day / 1,200 gal/acre/day
X	=	4.17 acres
X	=	4.17 acres × 43,560 square feet
X	=	181,500 square feet of land needed

 

Similarly, for a nonpublic (individual) water supply, to determine Y = the square footage of the lot needed for a proposed sewage flow of 5,000 gpd, use the following formula:

Y	=	5,000 gal/day / 600 gal/acre/day
Y	=	8.33 acres
Y	=	8.33 acres × 43,560 square feet
Y	=	363,000 square feet of land needed

 

Lot sizing requirements are as follows for multifamily residential dwellings, all other non-single-family dwellings and commercial structures, and mobile homes located in commercial mobile home parks. Subsection (d)(1) through (6) of this section also apply to Table MT-2.

TABLE MT-2
MINIMUM LOT SIZES, MINIMUM LOT WIDTHS
AND MAXIMUM ALLOWABLE SEWAGE FLOW
FOR THE TYPE OF WATER SUPPLY SYSTEM

	Type of Water Supply System
	Nonpublic (Individual)	Public
Minimum lot size	43,560 square feet	21,780 square feet
Minimum lot width	150 feet	100 feet
Maximum sewage flow	600 gpad	1,200 gpad

 

Source: DHR Manual for On-Site Sewerage Management Systems

"Nonpublic" means an individual water supply system or any other water supply system which is not a "public" water supply system.

"GPAD" means gallons per acre per day or gallons/acre/day.

(Ord. of 12-12-2000(1), §§ 6.1, 6.2; Ord. of 3-13-2001, § 1)