Tapcensus

California

Lake County drinking water quality

81 active public water systems serve 72,691 people in Lake County. 64 are compliant, 17 had at least one EPA violation in the past three years, 0 are designated serious violators, and 9 carry a health flag.

Active systems 81 43 community systems
People served 73K by public water systems
Systems with violations 17 21% of active systems, past 3 years
Serious violators 0 9 systems carry a health flag

Needs attention

Cobb Area County Water District CA1710012 · Community water system · Serves 3,515 2 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Callayomi County Water District CA1710013 · Community water system · Serves 1,607 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Loch Lomond Mutual Water CO CA1700518 · Community water system · Serves 666 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Bella Lago Mobile Home Park CA1700610 · Community water system · Serves 152 2 rules violated in the past three years. Unresolved: Lead and Copper Rule (LCR) and Lead and Copper Rule Revisions (LCRR).
Pier 1900 Homeowner's Association CA1700630 · Community water system · Serves 152 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Harbin Hot Springs CA1700511 · Non-Transient non-community system · Serves 101 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Blue Lakes Improvement Club CA1700561 · Community water system · Serves 90 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Twin Creeks Mobile and RV Village CA1700580 · Community water system · Serves 50 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).
Blue Lakes Mobile Home Park CA1700589 · Community water system · Serves 31 1 rule violated in the past three years. Unresolved: Lead and Copper Rule Revisions (LCRR).

Community water systems

43 systems, largest first
SystemServesStatusRules violated, 3 yrUnresolved
Highlands Mutual Water Company
 7,772 0 0
Hidden Valley Lake Csd
 6,235 0 0
Konocti County Water District
 5,928 0 0
Lakeport, City of
Lakeport 		4,762 0 0
Golden State Water Co.-Clearlake System
 4,623 0 0
Mt. Konocti Mutual Water Company
 4,360 0 0
Kelseyville CO Waterworks District 3
 4,102 0 0
Lake County Csa 21 North Lakeport
 4,046 0 0
Cobb Area County Water District
 3,515 2 2
Nice Mutual Water Company
 2,929 0 0
Clearlake Oaks County Water District
 2,359 1 0
Lucerne Water Co. Cal Water Service
 2,312 0 0
Lake County Csa 20 Soda Bay
 2,003 0 0
Callayomi County Water District
 1,607 1 1
Lake County Csa 2 Spring Valley
 1,531 0 0
Buckingham Park Water District
 1,502 0 0
Lower Lake County Water District
 1,326 2 0
Upper Lake County Water District
 989 0 0
Loch Lomond Mutual Water CO
 666 1 1
Harbor View Mutual Water Company
 550 1 1
Lake County Csa 13 Kono Tayee
 449 0 0
Anderson Springs Csd
 373 0 0
Glenhaven Mutual Water Company
 300 0 0
Cal 20 Village and Meadow Pointe Park
 255 0 0
Walnut Cove Mobile Estates
 200 0 0
Clear Water Mutual Water Company
 154 0 0
Bella Lago Mobile Home Park
 152 2 2
Pier 1900 Homeowner's Association
 152 1 1
Westwind Mobile Home Park
 104 0 0
Cdf-Konocti Conservation Camp No. 27
 100 0 0
Blue Lakes Improvement Club
 90 1 1
Sunrise Shore Mutual Water Company
 83 0 0
Corinthian Bay Mutual Water Company
 75 0 0
Lazy S Mobile Ranch
 73 1 0
Baycliff Water
 70 0 0
Blue Lakes Village
 65 0 0
Villa Blue Estates Water District
 60 1 1
Twin Creeks Mobile and RV Village
 50 1 1
Blue Lakes Mobile Home Park
 31 1 1
Golden State Water Company South Shore
 30 2 1
Konocti Shores
 30 0 0
Mountain of Attention Water
 26 0 0
Windflower Point Mutual Water Company
 25 1 1
Non-community systems (38: schools, campgrounds, workplaces, restaurants)

These systems serve places people visit rather than homes.

SystemServesStatusRules violated, 3 yrUnresolved
Lakeside County Park
 1,000 0 0
Rotten Robbie
 992 0 0
LE Trianon Resort
 539 0 0
Konocti Harbor Resort
 505 1 0
Lakeport Cinemas
 400 0 0
Huttopia Six Sigma Campground
 330 0 0
Cache Creek Vineyards
 310 0 0
Mandala Water System
 212 0 0
Westgate Petroleum
Lakeport 		210 0 0
Saratoga Springs Retreat Center
 208 0 0
Reel in Resort
 200 0 0
Jitter Bean Coffee
Lakeport 		160 0 0
Lake Pillsbury Resort & Marina INC
 150 0 0
Larsen's Office Complex
 112 0 0
Thomas Water System
Lakeport 		110 0 0
Usfs-Sunset Point Campground
 110 0 0
Harbin Hot Springs
 101 1 1
Lodge at Blue Lakes
 100 0 0
Reynolds Water System
 100 0 0
Northern California Vipassana Center
 80 0 0
Indian Beach Resort
 75 0 0
The Narrows Family Resort
 74 0 0
Brassfield Estate Winery
 54 0 0
Lake Pillsbury Ranch Water Company
 52 0 0
Wildwood
 50 0 0
Mendo Mill and Lumber Company
Lakeport 		45 0 0
Langtry Farms
 41 0 0
Usfs-Middle Creek CG
 40 0 0
Wall Water
 40 0 0
Richmond Park Resort
 34 0 0
The Mercantile
 28 0 0
Hidden Valley Food Mart
 25 0 0
Jack in the Box Lakeport, CA
 25 0 0
Pine Acres Blue Lake Resort
 25 0 0
Sky Park Properties
 25 0 0
Three Brothers Travel Plaza
 25 0 0
Usfs Oak Flat Water System
 25 0 0
Jago Bay Mutual Water Company
 15 0 0
Inactive systems (152, 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. Retrieved from ECHO on Oct 11, 2026.