Oregon water quality
Oregon has 2,548 active public water systems (6,046 on file total), 943 of them graded by TapGraded.
Grade distribution
Biggest water systems
PORTLAND WATER BUREAU
PORTLAND, OR · 666,200 served
TUALATIN VALLEY WATER DISTRICT
BEAVERTON, OR · 224,600 served
SALEM PUBLIC WORKS
SALEM, OR · 199,820 served
EUGENE WATER & ELECTRIC BOARD
EUGENE, OR · 176,000 served
MEDFORD WATER COMMISSION
MEDFORD, OR · 106,068 served
HILLSBORO, CITY OF
HILLSBORO, OR · 92,632 served
BEAVERTON, CITY OF
BEAVERTON, OR · 88,045 served
BEND, CITY OF
BEND, OR · 77,704 served
GRESHAM, CITY OF
GRESHAM, OR · 73,932 served
ROCKWOOD PUD
PORTLAND, OR · 65,443 served
Lowest-graded systems
Active, graded systems serving at least 10,000 people, ordered by lowest Tap Grade first.
GLADSTONE, CITY OF
GLADSTONE, OR · 12,121 served
SANDY, CITY OF
SANDY, OR · 12,991 served
BEND, CITY OF
BEND, OR · 77,704 served
KLAMATH FALLS WATER DEPT
KLAMATH FALLS, OR · 40,475 served
MILWAUKIE, CITY OF
MILWAUKIE, OR · 20,946 served
HERMISTON, CITY OF
HERMISTON, OR · 20,000 served
SPRINGFIELD UTILITY BOARD
SPRINGFIELD, OR · 62,100 served
SUNRISE WATER AUTHORITY
HAPPY VALLEY, OR · 50,003 served
PENDLETON, CITY OF
PENDLETON, OR · 16,996 served
COTTAGE GROVE, CITY OF
COTTAGE GROVE, OR · 10,879 served
Cities in Oregon
Source: EPA SDWIS/ECHO · Data as of 2026Q2