New York Codes, Rules and Regulations
Title 6 - DEPARTMENT OF ENVIRONMENTAL CONSERVATION
Chapter X - DIVISION OF WATER RESOURCES
Subchapter A - GENERAL
Article 2 - CLASSIFICATIONS AND STANDARDS OF QUALITY AND PURITY
Part 701 - Classifications-surface Waters And Groundwaters
Fresh Surface Waters
Section 701.5 - Class aa fresh surface waters

(a) The best usages of Class AA waters are: a source of water supply for drinking, culinary or food processing purposes; primary and secondary contact recreation; and fishing. The waters shall be suitable for fish, shellfish and wildlife propagation and survival.

(b) This classification may be given to those waters that, if subjected to approved disinfection treatment, with additional treatment if necessary to remove naturally present impurities, meet or will meet New York State Department of Health drinking water standards and are or will be considered safe and satisfactory for drinking water purposes.