Table 1 US public water systems (PWSs) by system size and population served, quarter 4, 2022^a.

	System size	Number of systems (%)	Population served (millions) (%)
Community water systems^b	Very small to medium^c	45,202 (91%)	52 (16%)
	Large^d	4030 (8%)	116 (36%)
	Very large^e	455 (1%)	151 (47%)
Noncommunity water systems^f	Very small to medium^c	101,829 (99.9%)	16.4 (84%)
	Large^d	65 (0%)	1.5 (8%)
	Very large^e	5 (--%)	1.6 (8%)
Total all PWSs	Very small to medium^c	147,031	68
	Large^d	4095	118
	Very large^e	460	153
		151,586	339

^aBased on data from the Government Performance and Results Act (CPRA) tool viewable at https://www.epa.gov/ground-water-and-drinking-water/drinking-water-performance-and-results-report.
^bCommunity Water System: serves the same 15 or more service connections or an average of at least 25 or more people for at least 60 days a year.
^cServing 10,000 customers or fewer .
^dServing 10,001-100,000 customers or fewer.
^eServing over 100,000 customers.
^fNon-Community Water System: serves at least 15 service connections or an average of at least 25 people for at least 60 days a year, but the population changes, such as campgrounds, restaurants, and schools .

Quick links

Search