Non-Transient		Transient
	Community		Non-Community		Non-Community
Water Source	Water Systems		Water Systems		Water Systems
		Population		Population		Population
	Systems	Served	Systems	Served	Systems	Served
	(number)	(millions)	(number)	(millions)	(number)	(millions)
Surface	10,760	168.7	781	0.8	2,067	0.9
	20%	67%	4%	13%	2%	5%
Ground	43,607	83.8	19,474	5.4	93,687	15.9
	80%	33%	96%	87%	98%	95%
Total	54,367	252.5	20,255	6.3	95,754	16.8
	100%	100%	100%	100%	100%	100%

Source:  U.S. Environmental Protection Agency, Office of Water, Office of Ground Water and Drinking Water, IMB SDWIS/FED Factoids, FY1998 Inventory Data (Internet accessible data from SDWIS 98Q4 frozen inventory table).

Notes:  Data for the report cited above are from EPA's Safe Drinking Water System (SDWIS) for the 12-month ending September 30, 1998. Populations are not summed because some people may be served by multiple systems and counted twice. CWS = Community Water System (supplies water to the same population year round). NTNCWS = Non-Transient Non-Community Water System (regularly supplies water to at least 25 of the same people at least six months per year, but not year-round. Some examples are schools, factories, office buildings, and hospitals which have their own water systems). TNCWS = Transient Non-Community Water System (provides water in a place such as a gas station or campground where people do not remain for long periods of time.

Last Updated on 1/20/01