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Water

Drinking Water - Water System Classifications

Water treatment plants are classified based on system size and type as defined by R. 44-55 State Safe Drinking Water Act.  

Type C - Community Water System
A public water system which serves at least fifteen service connections used by year-round residents or regularly serves at least twenty-five year-round residents.  This may include, but is not limited to, subdivisions, municipalities, mobile home parks, and apartments.  Sanitary surveys are performed annually.

Type N or NTNC - Transient Non-community water system
A non-community water system that does not regularly serve at least twenty-five of the same persons over six months a year.  Sanitary surveys are performed every three years.

Type P or TNC - Non-transient Non-community Water SystemA public water system that is not a community water system and that regularly serves at least twenty-five of the same persons over six months per year. Sanitary surveys are performed every two years.

Type S or NP - State Water System
Any water system that serves less than fifteen service connections or regularly serves an average of less than twenty-five individuals daily.  Sanitary surveys are performed every five years. 


Bureau of Water . Phone: (803) 898-4300 . Fax: (803) 898-3795 . Contact Us