Nevada County Lake Quality

California, 1 lake — no lake here has enough monitoring data for a grade

Nevada County has 1 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters.

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. Lake Combie (—) is the cleanest in the county.

Loading map…

Where to stay near Nevada County

Top-rated places to stay near Nevada County

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Planning a trip to Nevada County?

Get lake water-quality report cards plus the best cabin & lodging deals near Nevada County — straight to your inbox. No spam, unsubscribe anytime.

Quick Answers for Nevada County

Cleanest lakes in Nevada County →Cleanest lakes in California →Safest swimming lakes in California →

Planning a trip? Check special fishing regulations for Lake Combie — or check the official California fishing regulations.

All Lakes in Nevada County

1 lake · 0 graded, 1 not rated0 graded lakes · 1 not rated, hidden

Include not-rated lakes (1)

#	Lake	Grade	Clarity	Phosphorus	Algae	Trophic	Access
	NRLake CombieNevada	NR	No recent samples	No recent samples	No recent samples	No recent samples	Not recorded

NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

Lake Match