PlainWater
Counties → California

Lake County, California

Water Systems
81
Population Served
72,533
Total Violations
1,460
329 health-based
PFAS Detected
7
of 8 tested

Violation Analysis

91.4%
Systems with Violations
18.0
Avg Violations per System
22.5%
Health-Based Violations

Water Source Types

GW
32 systems (40%)
SW
18 systems (22%)

PFAS Contamination

8
Systems Tested
7
PFAS Detected
87.5%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Lake California water systems by violation status, EPA SDWIS records.

No violations on record (3) One or more violations (47)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Highlands Mutual Water Company 7,772 23 Clean
Hidden Valley Lake Csd 6,235 2 Clean
Konocti County Water District 5,928 3 Detected
Lakeport, City Of 4,762 9 Clean
Golden State Water Co.-Clearlake System 4,644 2 Clean
Mt. Konocti Mutual Water Company 4,360 14 Clean
Kelseyville Co Waterworks District 3 4,102 0 Clean
Lake County CSA 21 - North Lakeport 4,046 5 -
Cobb Area County Water District 3,515 12 -
Nice Mutual Water Company 2,929 6 -
Clearlake Oaks County Water District 2,359 21 -
Lucerne Water Co. - Cal Water Service 2,129 10 Clean
Lake County CSA 20 - Soda Bay 2,003 1 -
Callayomi County Water District 1,598 8 -
Lake County CSA 2 - Spring Valley 1,531 23 -
Buckingham Park Water District 1,521 24 -
Lower Lake County Water District 1,326 12 -
Lakeside County Park 1,000 12 -
Upper Lake County Water District 989 7 -
Rotten Robbie 899 4 -
Loch Lomond Mutual Water Co 693 26 -
Harbor View Mutual Water Company 550 73 -
Lake County CSA 13 - Kono Tayee 449 4 -
Harbin Hot Springs 401 20 -
Lakeport Cinemas 400 16 -
Anderson Springs Csd 373 31 -
Huttopia Six Sigma Campground 370 0 -
Cache Creek Vineyards 310 0 -
Glenhaven Mutual Water Company 300 19 -
Konocti Shores 277 26 -
Cal 20 Village and Meadow Pointe Park 255 30 -
Clear Water Mutual Water Company 252 46 -
Le Trianon Resort 243 24 -
Mandala Water System 212 18 -
Westgate Petroleum 210 4 -
Saratoga Springs Retreat Center 208 8 -
Reel in Resort 200 40 -
Walnut Cove Mobile Estates 200 22 -
Jitter Bean Coffee 160 4 -
Konocti Harbor Resort 155 9 -
Pier 1900 Homeowner's Association 152 7 -
Bella Lago Mobile Home Park 152 33 -
Corinthian Bay Mutual Water Company 150 21 -
Lake Pillsbury Resort & Marina Inc 150 24 -
Larsen's Office Complex 112 17 -
Usfs-Sunset Point Campground 110 3 -
Thomas Water System 110 2 -
Westwind Mobile Home Park 104 45 -
Lodge at Blue Lakes 100 12 -
Cdf-Konocti Conservation Camp No. 27 100 29 -

Other Counties in California

Los Angeles County
276 systems · 10,109,089 served · 3,972 violations
San Diego County
197 systems · 3,744,323 served · 4,832 violations
Orange County
46 systems · 3,201,893 served · 507 violations
Riverside County
201 systems · 2,839,125 served · 6,103 violations
San Bernardino County
318 systems · 2,830,626 served · 4,611 violations
Alameda County
27 systems · 2,249,634 served · 275 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Lake County? ▼
Lake County has 1,460 total drinking water violations across 81 water systems, of which 329 are health-based violations. 91.4% of systems have at least one violation.
How many people get water from Lake County systems? ▼
Water systems in Lake County serve approximately 72,533 people through 81 public water systems.
Has PFAS been detected in Lake County water? ▼
Of 8 water systems tested for PFAS in Lake County, 7 had PFAS detected (87.5% detection rate).
What types of water sources supply Lake County? ▼
Water systems in Lake County use GW (32 systems), SW (18 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 22.5% of Lake County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.