Question 1

How clean is Gmw-04 Lake?

Accepted Answer

Gmw-04 Lake has very poor water quality and a high algae bloom risk. It received a water quality grade of F (Very Poor) based on EPA monitoring data. Water clarity (Secchi depth): 3.1 ft. Chlorophyll-a (algae): 103.2 µg/L. Trophic State Index: 68.

Question 2

What is the water clarity of Gmw-04 Lake?

Accepted Answer

Gmw-04 Lake has a Secchi depth (water clarity) of 3.1 feet. That is moderate clarity, typical of lakes with some nutrient enrichment.

Question 3

Does Gmw-04 Lake have an algae problem?

Accepted Answer

Gmw-04 Lake has a chlorophyll-a (algae) level of 103.2 µg/L. That is high — the lake is at meaningful risk of harmful algal bloom advisories in summer.

Question 4

Is Gmw-04 Lake polluted?

Accepted Answer

Gmw-04 Lake shows pollution indicators consistent with nutrient over-enrichment (typically phosphorus from agricultural runoff, fertilizer, or failing septic systems). Its grade of F reflects elevated nutrient and algae levels.

Metric	Gmw-04 Lake	Wisconsin avg
Overall Grade	F	D
Water Clarity (Secchi)	3.1 ft	—
Chlorophyll-a (Algae)	103.2 µg/L	<10 = clean
Trophic State Index	68	<50 = clean

How Clean Is Gmw-04 Lake?

Cleanliness Snapshot

How does Gmw-04 Lake compare?

More on Gmw-04 Lake