What is the cleanest lake in Lancaster County, Pennsylvania?

Muddy Run Recreation Reservoir in Lancaster County is the highest-rated lake in Lancaster County, Pennsylvania 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 Lancaster County, Pennsylvania

Muddy Run Recreation Reservoir in Lancaster County leads the rankings with a water quality grade of NR. Below are the top 3 cleanest monitored lakes in Lancaster County, Pennsylvania, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Muddy Run Recreation Reservoir	Lancaster	NR	-	-	-
2	Speedwell Forge Dam	Lancaster	NR	-	-	-
3	Middle Creek Reservoir	Lancaster	NR	-	-	-

Ranked List

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