Washington
Mason County drinking water quality
242 active public water systems serve 76,405 people in Mason County. 154 are compliant, 88 had at least one EPA violation in the past three years, 2 are designated serious violators, and 0 carry a health flag.
Needs attention
Community water systems
120 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Allyn Carey |
45 | 2 | 0 | |
|
Lakewood Community |
45 | 2 | 0 | |
|
Ripplewood Tracts |
45 | 0 | 0 | |
|
Olympic Trails Water Supply |
44 | 1 | 0 | |
|
Vineyard Cove Corporation |
44 | 1 | 0 | |
|
Canyonwood Beach Water Supply |
43 | 1 | 0 | |
|
Kamilche Shores |
43 | 0 | 0 | |
|
Lakewood Manor Association |
42 | 1 | 0 | |
|
Mountain View |
41 | 0 | 0 | |
|
Olympic Vista Club Community Water |
41 | 0 | 0 | |
|
Mountain Shores CC |
40 | 0 | 0 | |
|
Viewcrest Beach |
40 | 0 | 0 | |
|
Hipma |
39 | 2 | 0 | |
|
Kamilche Point Community Club |
39 | 0 | 0 | |
|
Rainier View |
37 | 0 | 0 | |
|
Bel Aire Cove |
32 | 0 | 0 | |
|
Smith Cove |
30 | 0 | 0 | |
|
Queen Anne Water Works LLC |
28 | 1 | 0 | |
|
Rivendell Water Association |
28 | 0 | 0 | |
|
Erickson Lake Tracts |
25 | 0 | 0 |
Non-community systems (122: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (195, no longer operating or reporting)
Kept for the record and excluded from the county totals above. Browse inactive systems.
About this data
Totals cover active systems. Systems serving more than one county are counted in each county. EPA counts the rules a system was in violation of, not the individual violations; one rule can carry several.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Washington records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.