Minnesota water quality
Minnesota has 6,566 active public water systems (21,653 on file total), 998 of them graded by TapGraded.
Grade distribution
Biggest water systems
Minneapolis
Minneapolis, MN · 425,300 served
Saint Paul Regional Water Services
St. Paul, MN · 392,529 served
Rochester
Rochester, MN · 123,624 served
Bloomington
Bloomington, MN · 91,300 served
Brooklyn Park
Brooklyn Park, MN · 89,995 served
Duluth
Duluth, MN · 86,859 served
Woodbury
Woodbury, MN · 82,643 served
Maple Grove
Maple Grove, MN · 82,000 served
Plymouth
Plymouth, MN · 76,546 served
Saint Cloud
St. Cloud, MN · 71,321 served
Lowest-graded systems
Active, graded systems serving at least 10,000 people, ordered by lowest Tap Grade first.
Inver Grove Heights
Inver Grove Heights, MN · 34,189 served
Hibbing
Hibbing, MN · 16,028 served
Lake Elmo
Lake Elmo, MN · 10,978 served
Hastings
Hastings, MN · 23,222 served
South Saint Paul
South St. Paul, MN · 20,664 served
Saint Paul Regional Water Services
St. Paul, MN · 392,529 served
Stillwater
Stillwater, MN · 19,462 served
Alexandria
Alexandria, MN · 15,000 served
Sauk Rapids
Sauk Rapids, MN · 13,835 served
Woodbury
Woodbury, MN · 82,643 served
Cities in Minnesota
Source: EPA SDWIS/ECHO · Data as of 2026Q2