Table 1.
US public water systems (PWSs) by system size and population served, quarter 4, 2022a.
| System size | Number of systems (%) | Population served (millions) (%) | |
|---|---|---|---|
| Community water systemsb | Very small to mediumc | 45,202 (91%) | 52 (16%) |
| Larged | 4030 (8%) | 116 (36%) | |
| Very largee | 455 (1%) | 151 (47%) | |
| Noncommunity water systemsf | Very small to mediumc | 101,829 (99.9%) | 16.4 (84%) |
| Larged | 65 (0%) | 1.5 (8%) | |
| Very largee | 5 (--%) | 1.6 (8%) | |
| Total all PWSs | Very small to mediumc | 147,031 | 68 |
| Larged | 4095 | 118 | |
| Very largee | 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 .