What is the cleanest lake in Latah County, Idaho?

Spring Valley Reservoir in Latah County is the highest-rated lake in Latah County, Idaho with an EPA water quality grade of NR.

How are these rankings calculated?

Lakes are graded A through F on nutrients and algae — total phosphorus, nitrogen, chlorophyll-a, and turbidity — against EPA National Lakes Assessment 2022 condition classes for that lake’s ecoregion. Water clarity (Secchi depth) is measured and shown; it is not the letter. Lakes without enough recent samples are UNRATED, not given an F. Source data comes from the EPA Water Quality Portal.

Cleanest Lakes in Latah County, Idaho

Spring Valley Reservoir in Latah County leads the rankings with a water quality grade of NR. Below are the top 2 cleanest monitored lakes in Latah County, Idaho, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Spring Valley Reservoir	Latah	NR	-	-	-
2	Moose Creek Reservoir	Latah	NR	-	-	-

Ranked List

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