Placer County Lake Quality

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

Only 1 lakes in Placer County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county.

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

Loading map…

Where to stay near Placer County

Top-rated places to stay near Placer 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 Placer County?

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

Quick Answers for Placer County

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

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

All Lakes in Placer 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
	NRFolsom LakePlacer	NR	No recent samples	4.5 µg/L	1 µg/L	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