Suffolk County Water Authority is a large public water system in EPA region 2 that provides tap water for the 11701 - 11706, 11716, 11717, 11720 - 11722, 11725 - 11727, 11730, 11731, 11735, 11741 - 11743, 11749, 11752, 11755, 11763, 11764, 11767 - 11770, 11776 - 11780, 11784, 11787, 11788, 11795, 11901, 11935, 11939, 11942, 11949, 11950, 11953, 11954, 11958, 11963 - 11965, 11968, 11976, 11980 zip codes.