What is the water clarity of Mazaska Lake?

Mazaska Lake has a Secchi depth (water clarity) of 2.5 feet. That is poor clarity, indicating heavy algae or sediment.

Does Mazaska Lake have an algae problem?

Mazaska Lake has a chlorophyll-a (algae) level of 51.3 µg/L. That is high — the lake is at meaningful risk of harmful algal bloom advisories in summer.

How Clean Is Mazaska Lake?

Q: Is Mazaska Lake polluted?

Mazaska Lake shows pollution indicators consistent with nutrient over-enrichment (typically phosphorus from agricultural runoff, fertilizer, or failing septic systems). Its has nutrient and algae measurements on record from state and federal monitoring, reflecting elevated nutrient and algae levels.

Mazaska Lake is algae-prone, with a higher bloom risk in warm months. Its nutrient and algae readings come from EPA monitoring data. Water clarity (Secchi depth): 2.5 ft. Phosphorus: 89 µg/L. Chlorophyll-a (algae): 51.3 µg/L. Trophic State Index: 67.

Cleanliness Snapshot

Metric	Mazaska Lake	Minnesota avg
Water Clarity (Secchi)	2.5 ft	—
Phosphorus	89 µg/L	<30 = clean
Chlorophyll-a (Algae)	51.3 µg/L	<10 = clean
Trophic State Index	67	<50 = clean

How does Mazaska Lake compare?

Mazaska Lake's readings run above the Minnesota state average. It ranks #8 of 14 lakes in Rice County by water quality score. Multi-year monitoring data shows water quality is declining based on 6 years of records.

Watch Mazaska Lake water quality

Get an email when the clarity or algae readings change. Unsubscribe anytime.

More on Mazaska Lake

Is Mazaska Lake safe for swimming? →What fish are in Mazaska Lake? →Is Mazaska Lake polluted? →When Does Mazaska Lake Freeze? Typical Ice-In Dec 1, Ice-Out Apr 6 →Full water quality report →Rice County lakes →Cleanest lakes in Rice County →Cleanest lakes in Minnesota →