Conn. Gen. Stat. § 13a-255: Adoption and maintenance of the Connecticut Plane Coordinate System.

(a) For the purposes of this section:

(1) “NSRS” means the National Spatial Reference System or a successor program;

(2) “Metadata” means the information about a data element that provides context for that data element, such as the geodetic reference system utilized, applicable epoch, statement of relative accuracy and date of observation;

(3) “National Geodetic Survey” or “NGS” means the agency of the National Oceanic and Atmospheric Administration within the United States Department of Commerce, or its successor; and

(4) “Connecticut Plane Coordinate System” or “CPCS” means the system established pursuant to this section that is identical to the state plane coordinate system as defined for the state of Connecticut by the National Geodetic Survey.

(b) The most recent plane coordinates that have been established by the National Geodetic Survey based on the NSRS, for purposes of defining and stating the geographic positions or locations of points in relation to the surface of the earth within the state of Connecticut shall be known as the Connecticut Plane Coordinate System. The official geodetic datums to which geodetic coordinates are referenced within the state of Connecticut, including, but not limited to, latitude, longitude, ellipsoid height, orthometric height or dynamic height, shall be as defined within the NSRS.

(c) The detailed description of the CPCS by the NGS shall be adopted and maintained by the Commissioner of Transportation or the commissioner's designee. Additional systems may be published by the commissioner or the commissioner's designee.

(d) The plane coordinates of a point in relation to the earth's surface, to be used for expressing the geographic position or location of the point in the appropriate zone, if applicable, of the CPCS, shall consist of two distances expressed in meters and decimals of a meter, or international feet and decimals of an international foot. One of these distances, to be known as the “northing or y-coordinate”, shall give the grid distance north of the x-axis of the system origin; the other, to be known as the “easting or x-coordinate”, shall give the grid distance east of the y-axis of the system origin. The x-axis of any zone shall be at right angles to the central meridian of that zone. The y-axis of any zone shall be parallel with the central meridian of that zone. The x-axis shall be perpendicular to the y-axis. When applicable, height shall be the coordinate value of the vertical elements of the NSRS expressed as international feet or meters and identified as an ellipsoid height or an orthometric height. The international foot, typically referred to as the foot, shall be used to express all foot distances and coordinates. A definition of one international foot equals three thousand forty-eight ten-thousandths meters shall be used. Other units may be used in previous or additional coordinate systems as published by the Commissioner of Transportation or the commissioner's designee.

(e) The use of the term “Connecticut Plane Coordinate System” on any map, report of survey or other document shall be limited to coordinates based on the CPCS, as adopted and maintained pursuant to subsection (c) of this section.

(f) For the purposes of describing the location of any survey station or land boundary corner in the state of Connecticut, it shall be considered a complete, legal and satisfactory description of such location to give the position of such survey station or land boundary corner on the system of plane coordinates, with a height if applicable, as defined in this section. The method and source for establishing coordinates shall be described in the land or deed record. In all instances where a reference has been made to coordinates in land surveys or deeds, a statement of the metadata of observations shall be included in the record.

(g) Nothing contained in this section shall require descriptions of real estate to be based only on CPCS.

(h) The commissioner or the commissioner's designee may enter upon private property for the purpose of surveying, establishing or maintaining the survey. The commissioner or the commissioner's designee shall use care so that no unnecessary damage shall result to any private property and the state shall be liable to the owner of such property for any damage so caused.

(i) After the official NGS release or the authorization of any subsequent updates to the Connecticut Plane Coordinate System, and upon the approval of its use or update by the Commissioner of Transportation or the commissioner's designee, new state mapping projects shall be based on said system's current realization unless a different system is determined to be necessary. Mapping coordinates based on the CPCS shall include a statement as to their basis in the metadata. Mapping based on a different system shall contain projection information and a clear statement of purpose regarding the decision to use said system in the metadata. Where feasible, mapping projects based on different systems should also be made available in CPCS unless such provision would create an undue hardship or burden on the project creator. The provisions of this section shall not be construed to prohibit the appropriate use of other datums, geodetic reference frames or plane coordinate systems, nor shall the provisions of this section require the revision of any survey, mapping project, deed, record or other document prepared or recorded that utilized any other coordinate systems previously authorized by the state.