Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water

Lake County Lake Quality

California, 64 lakes, measured by SWRCB

Lake County has 64 monitored lakes, enough that within-county variation matters as much as the county average. Some are deep glacial basins, others are shallow agricultural-watershed waters, and the measurements reflect that mix. The 64 monitored lakes in Lake County carry whatever clarity, phosphorus, and chlorophyll-a readings SWRCB has published, shown as reported.

Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed.

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Top-rated places to stay near Lake County

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Quick Answers for Lake County

Cleanest lakes in Lake County →Best swimming lakes in California →

Planning a trip? Check special fishing regulations for A Bridge Within the Oaks Keys on Blue Heron Drive Lake — or check the official California fishing regulations.

All Lakes in Lake County

64 lakes · 0 ranked on readings, 64 without enough sampling0 lakes ranked on readings · 64 without enough sampling, hidden

Include not-rated lakes (64)

Lake	Clarity	Phosphorus	Algae	Trophic	Access
A Bridge Within the Oaks Keys on Blue Heron Drive LakeLake	No recent samples	No recent samples	20 µg/L	No recent samples	Not recorded
At End of El-Em St. on Elem Indian Colony LakeLake	No recent samples	No recent samples	16.3 µg/L	No recent samples	Not recorded
Blue LakesLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Boat Ramp of Big Valley Rancheria Marina LakeLake	2.2 ft	No recent samples	9.7 µg/L	No recent samples	Not recorded
Boggs LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Borax LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Bridge on Blue Heron Street LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Buckingham Point LakeLake	No recent samples	No recent samples	8.7 µg/L	No recent samples	✓ Public
Clear Lake A Mooring laLake	No recent samples	165.5 µg/L	14 µg/L	No recent samples	Not recorded
Clear Lake A Mooring OaLake	No recent samples	253 µg/L	10.8 µg/L	No recent samples	Not recorded
Clear Lake A Mooring UaLake	No recent samples	138 µg/L	8.7 µg/L	No recent samples	Not recorded
Clear Lake A Redbud Park A ClearlakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Clear Lake A Stubbs IslandLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Clear Lake A Sulphur Bank MineLake	No recent samples	No recent samples	73.6 µg/L	No recent samples	Not recorded
Clear Lake OaksLake	No recent samples	No recent samples	16.7 µg/L	No recent samples	Not recorded
Clearlake OaksLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
County Park LakeLake	No recent samples	No recent samples	14.4 µg/L	No recent samples	✓ Public
Detert ReservoirLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
East Corner of Big Valley Rancheria Marina LakeLake	2 ft	No recent samples	9.8 µg/L	No recent samples	Not recorded
Elem Colony LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Fishing Point LakeLake	1.6 ft	No recent samples	8.5 µg/L	No recent samples	Not recorded
Frog PondLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Glenhaven LakeLake	No recent samples	No recent samples	5.7 µg/L	No recent samples	Not recorded
Glenhaven Private Property LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Herman Impoundment LakeLake	No recent samples	3 µg/L	1.5 µg/L	No recent samples	Not recorded
Hidden Valley LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Highland Springs ReservoirLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Horseshoe Bend LakeLake	No recent samples	No recent samples	20.3 µg/L	No recent samples	Not recorded
Housing PondLake	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
Jago Bay LakeLake	No recent samples	No recent samples	9.6 µg/L	No recent samples	Not recorded
Kayan PondLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Keeling Park Nice LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Lake BordeauxLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Lake PillsburyLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Lake Shore Adjacent To New Tnt Restaurant on ShorelineLake	No recent samples	No recent samples	108.9 µg/L	No recent samples	Not recorded
Land'S End Slough LakeLake	1.5 ft	No recent samples	10.7 µg/L	No recent samples	Not recorded
Lily Cove LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Lower Blue LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Lower Bohn LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Lucerne Harbor Park LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Marina Lake SiteLake	2 ft	No recent samples	18.6 µg/L	No recent samples	Not recorded
McCreary LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
North Pit LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Old Lakeport Tnt RestaurantLake	No recent samples	No recent samples	17.5 µg/L	No recent samples	Not recorded
Redbud Park LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	✓ Public
Rodman Slough LakeLake	No recent samples	No recent samples	12.6 µg/L	No recent samples	Not recorded
Rumsey Slough by the Old Bridge LakeLake	No recent samples	No recent samples	4.6 µg/L	No recent samples	Not recorded
Rumsey Slough End LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Rumsey Slough Mid LakeLake	No recent samples	No recent samples	4.6 µg/L	No recent samples	Not recorded
Rumsey Slough Mouth LakeLake	1.6 ft	No recent samples	7.2 µg/L	No recent samples	Not recorded
Schindler Creek Bridge LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Shady Acres Campground Now Called Clearlake CampgroundLake	No recent samples	No recent samples	13.4 µg/L	No recent samples	Not recorded
Solar Bee of Big Valley Rancheria Marina LakeLake	2.3 ft	No recent samples	14.4 µg/L	No recent samples	Not recorded
State Dwr-Lower Arm of Clear LakeLake	29.2 ft	No recent samples	No recent samples	No recent samples	Not recorded
State Dwr-Oaks Arm of Clear LakeLake	36.7 ft	No recent samples	No recent samples	No recent samples	Not recorded
State Dwr-Upper Arm of Clear LakeLake	5.6 ft	No recent samples	No recent samples	No recent samples	Not recorded
Sulphur Bank Mercury Mine LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Thurston LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Tule Boat Launch LakeLake	2.3 ft	No recent samples	27.5 µg/L	No recent samples	Not recorded
Tule Lake A Upper LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Tule PondLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
Upper Bohn LakeLake	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded
West Corner of Big Valley Rancheria Marina LakeLake	2.1 ft	No recent samples	8.6 µg/L	No recent samples	Not recorded
Western Boundary LakeLake	1.5 ft	No recent samples	13 µg/L	No recent samples	Not recorded

NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.

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Source: the California State Water Resources Control Board. See data sources.