What is the water quality grade for Lake Conroe?

Lake Conroe in Montgomery County, Texas received a water quality grade of D (Poor). Water clarity: 2.2 ft visibility. Phosphorus: 70 µg/L.

Is Lake Conroe safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Lake Conroe has an overall water quality grade of D. Always check local health department advisories before swimming.

Montgomery County, Texas

Lake Conroe

Grade DPoor · 2.2 ft clarity

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Limited DataEutrophic

Lake Conroe is a productive, nutrient-rich eutrophic lake in Montgomery County, Texas. Water quality is graded D based on 1 sampling years through 2023.

Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2023-12-21. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

Water Quality Grade: D, Poor

Very murky, less than 2.2 ft of visibility. Phosphorus level: 70 µg/L. Trophic State Index: 65.

Metric	Value	Grade
Water Clarity (Secchi Depth)	2.2 ft	F
Phosphorus	70 µg/L	D
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	65	Eutrophic

High nutrients, frequent algae, reduced clarity

Where to stay near Lake Conroe

Compare lakeside cabins, hotels, and vacation rentals near Lake Conroe in Montgomery County, Texas — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

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