Table 2 US public water systems (PWSs) by water source quarter 4, 2022a.

From: US drinking water quality: exposure risk profiles for seven legacy and emerging contaminants

 

Source water type

Number of systems

Population served (millions)

Community water systemsb

Groundwater

37,936

91

Surface water

11,714

229

Noncommunity water systemsc

Groundwater

98,689

17.3

Surface water

3038

2.2

Total all PWSs

Groundwater

136,625

108

Surface water

14,752

231

All sources

151,377

339

  1. aEPA. Safe Drinking Water Information System, GPRA [Government Performance and Responsibility Act] Inventory Report, 2022 Q4 [Quarter 4], available online at https://obipublic.epa.gov/analytics/saw.dll?PortalPages&PortalPath=/shared/SFDW/_portal/Public (visited February 22, 2023). Note that due to rounding, the total percentages may not add up to precisely 100%.
  2. 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.
  3. cNoncommunity 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. Examples: campgrounds, restaurants, etc.
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