Code of Alabama
Chapter 26 - Sewage Collection, Treatment and Disposal Facilities.
Section 22-26-7 - Certain Land Subdivided for Single-Family Residences and Not Having Access to Public Sewer Not Subject to Subdivision Regulations of State Board of Health.

(a) Land subdivided for single-family residential purposes into lots of not less than three acres in size shall not be subject to the subdivision criteria and the rules and regulations imposed by the State Board of Health upon development where said lots do not have access to public sewer system where:
(1) There is a plat restriction that the land will not be further divided into parcels of less than three acres in size until such lots have access to a public sewer system;
(2) Where the bedrock elevation is of sufficient depth below ground elevation to install a septic tank of sufficient capacity, header line and adequate field line system leading from said septic tank;
(3) Where the standard, residential percolation test times shall not exceed 60 minutes per inch, without additional information; and
(4) Where the water table elevation is not within five feet of ground elevation.
(b) At such time that all such adjoining lots have access to a public sewer system, the property may be further subdivided into lots of less than three acres in size for residential and other purposes, provided the residences and other structures designed for human habitation on the property use such public sewer system.
(c) Where said land is subdivided into parcels containing any tracts five acres in size and larger, such tracts shall not be subject to the provisions of subdivision (3) of subsection (a) of this section.

Structure Code of Alabama