The Resource Protection District includes areas in which development would adversely affect water quality, productive habitat, biological ecosystems, or scenic and natural values. This district shall include the following areas when they occur within the limits of the shoreland zone, exclusive of the Stream Protection District, except that areas which are currently developed and areas which meet the criteria for the General Development I District need not be included within the Resource Protection District:
A. 
Floodplains along rivers and floodplains along artificially formed great ponds along rivers, defined by the 100-year floodplain as designated on the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Maps or Flood Hazard Boundary Maps or the flood of record or, in the absence of these, by soil types identified as recent floodplain soils. This district shall also include 100-year floodplains adjacent to tidal waters as shown on FEMA's Flood Insurance Rate Maps or Flood Hazard Boundary Maps.
B. 
Areas of two or more contiguous acres with sustained slopes of 20% or greater.
C. 
Areas of two or more contiguous acres supporting wetland vegetation and hydric soils, which are not part of a freshwater or coastal wetland as defined, and which are not surficially connected to a water body during the period of normal high water.
NOTE: These areas usually consist of forested wetlands abutting water bodies and nonforested wetlands.
D. 
Land areas along rivers subject to severe bank erosion, undercutting, or riverbed movement, and lands adjacent to tidal waters which are subject to severe erosion or mass movement, such as steep coastal bluffs.
E. 
Areas within 250 feet, horizontal distance, of the upland edge of freshwater and/or coastal wetlands, which are rated "moderate" or "high" value waterfowl and wading bird habitat, including nesting and feeding areas, by the Maine Department of Inland Fisheries and Wildlife (MDIF&W). These areas are generally depicted on a Geographic Information System (GIS) data layer.
The Limited Residential District includes those areas suitable for residential and recreational development. It includes areas other than those in the Resource Protection District or Stream Protection District and areas which are used less intensively than those in the General Development District.
The General Development District includes the following types of existing, intensively developed areas:
A. 
Areas of two or more contiguous acres devoted to commercial, industrial, or intensive recreational activities, or a mix of such activities, including but not limited to the following:
(1) 
Areas devoted to manufacturing, fabricating, or other industrial activities;
(2) 
Areas devoted to wholesaling, warehousing, retail trade and service activities, or other commercial activities; and
(3) 
Areas devoted to intensive recreational development and activities, such as, but not limited to, amusement parks, racetracks, and fairgrounds.
B. 
Areas otherwise discernible as having patterns of intensive commercial, industrial, or recreational uses.
The Stream Protection District includes all land areas within 75 feet, horizontal distance, of the normal high-water line of a stream, exclusive of those areas within 250 feet, horizontal distance, of the normal high-water line of a great pond or river or within 250 feet, horizontal distance, of the upland edge of a freshwater or coastal wetland. Where a stream and its associated shoreland area are located within 250 feet, horizontal distance, of the above water bodies or wetlands, that land area shall be regulated under the terms of the shoreland district associated with that water body or wetland.