(a)  With the exception of Class D-Well, the public water system treatment classification shall be based on the source of water and the number of points assigned to each facility as taken from the table in Rule .0203(b) of this Section.  Classifications are as follows:

Class C                                  1-50 points

Class B                                  51-110 points

Class A                                  over 110 points

Class D-Well is any non-community public water system with hypochlorite solution as the only treatment applied to the water. 

(b)  The classification of distribution systems shall apply to all community and non-transient non-community public water systems.  The distribution system class level shall be the greater of the treatment plant class level from Paragraph (a) of this Rule or the following class level based on the number of service connections and fire protection:

(1)           Class D-DISTRIBUTION is any system with 100 or fewer service connections with no fire protection system;

(2)           Class C-DISTRIBUTION is any system with more than 100 service connections but not exceeding 1,000 service connections, with no fire protection system;

(3)           Class B-DISTRIBUTION is any system with more than 1,000 service connections but not exceeding 3,300 service connections or any system not exceeding 1,000 service connections with a fire protection system; and

(4)           Class A-DISTRIBUTION is any system with more than 3,300 service connections.

(c)  The classification CROSS‑CONNECTION‑CONTROL is also applied to any distribution system with requirement for five or more testable backflow prevention assemblies to be installed within the water distribution system.


History Note:        Authority G.S. 90A‑21(c); 90A-22;

Eff. February 1, 1976;

Amended Eff. September 1, 1977;

Readopted Eff. March 1, 1979;

Amended Eff. November 1, 2006; August 1, 2002; August 1, 2000; August 3, 1992; September 1, 1990; December 31, 1980; January 1, 1980.