What is the cleanest lake in San Augustine County, Texas?

Sam Rayburn Reservoir in San Augustine County is the highest-rated lake in San Augustine County, Texas with an EPA water quality grade of C and 3.9 feet of water clarity.

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 San Augustine County, Texas

Sam Rayburn Reservoir in San Augustine County leads the rankings with a water quality grade of C and 3.9 ft of clarity. Below are the top 2 cleanest monitored lakes in San Augustine County, Texas, ranked by EPA water quality score.

Ranked List

#	Lake	County	Grade	Clarity	Phosphorus	Algae
1	Sam Rayburn Reservoir	San Augustine	C	3.9 ft	27.5 µg/L	18.6 µg/L
2	City Lake	San Augustine	NR	-	-	-

Ranked List

More Answers for San Augustine County, Texas