City Water Quality Rankings in Oregon
181 cities ranked by drinking water quality.
Popular city water quality comparisons
Trending Cities
#169
Molalla
County, OR
49 D
#170 Colton
County, OR
47 D
#171 Klamath Falls
County, OR
43 F
#172 Island City
County, OR
34 F
#173 Rainier
County, OR
34 F
#174 Harrisburg
County, OR
32 F
#175 Lyons
County, OR
30 F
#176 Prineville
County, OR
28 F
#177 Lakeview
County, OR
25 F
#178 Rickreall
County, OR
24 F
#179 Coquille
County, OR
16 F
#180 Gladstone
County, OR
0 F
#181 Warm Springs
County, OR
0 F
Frequently Asked Questions
How are city water quality rankings calculated in Oregon?
WaterQ city rankings are based on EPA SDWIS data across local public water systems, including contaminant detections, compliance violations, and recency-weighted score signals.
Can I compare two cities in Oregon?
Yes. Use the city comparison links on this page or open the Compare tool to evaluate two cities side by side on score, grade, and water system coverage.
How often does WaterQ refresh city data?
City-level metrics refresh when new EPA data is processed. Check city pages for latest score and violation context.