California
Santa Clara County drinking water quality
119 active public water systems serve 2,074,486 people in Santa Clara County. 78 are compliant, 41 had at least one EPA violation in the past three years, 0 are designated serious violators, and 11 carry a health flag.
Needs attention
1 more systems with a serious violator or health flag designation are in the lists below.
Community water systems
73 systems, largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Oakmont Water System |
61 | 0 | 0 | |
|
Mireval Improvement Association |
60 | 1 | 0 | |
|
Los Ranchos de Uvas Water Company |
58 | 1 | 1 | |
|
Quail Creek Estates Mutual Water Company |
55 | 0 | 0 | |
|
Green Acres Mutual Water |
53 | 1 | 1 | |
|
Sullivan Mutual Water |
53 | 2 | 1 | |
|
Muriel Wright Residential Center |
52 | 0 | 0 | |
|
South County Retirement Home |
46 | 0 | 0 | |
|
Aborn Heights Water Mutual Association |
45 | 1 | 1 | |
|
Valley View Ranches |
45 | 2 | 0 | |
|
Emerald Valley Mutual Water Company |
43 | 0 | 0 | |
|
Maria Lane Mutual Water Company |
42 | 0 | 0 | |
|
Angelo Lane Water Company |
40 | 0 | 0 | |
|
Chiri Sweet Water Company |
40 | 1 | 0 | |
|
Mountain Springs Mutual Water Company |
40 | 0 | 0 | |
|
Stonebridge Mutual Water CO |
38 | 0 | 0 | |
|
Deer Hill Mutual Water CO |
36 | 0 | 0 | |
|
Lee's Orchard Owners Association Santa Clara |
35 | 0 | 0 | |
|
Foothill Mutual Water Company |
32 | 3 | 2 | |
|
Live Oak Creek Mutual Water Company |
30 | 1 | 0 | |
|
Rockwood Estates Mutual Water Company |
28 | 0 | 0 | |
|
Thousand Trails Morgan Hill |
13 | 1 | 0 | |
|
Santa Clara Valley Water District |
0 | 0 | 0 |
Non-community systems (46: schools, campgrounds, workplaces, restaurants)
These systems serve places people visit rather than homes.
Inactive systems (203, 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 California 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.