Is Lake of Egypt Safe for Swimming?
Lake of Egypt in Williamson County, Illinois has a water quality grade of D (Nutrient-rich). Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Water clarity: 3.2 ft visibility. Phosphorus: 40.5 µg/L. Chlorophyll-a (algae): 22.1 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | D (Nutrient-rich) |
| Water Clarity (Secchi Depth) | 3.2 ft |
| Phosphorus | 40.5 μg/L |
| Chlorophyll-a (Algae) | 22.1 μg/L |
| Location | Williamson County, Illinois |
How does Lake of Egypt compare?
With an overall water quality grade of D, Lake of Egypt matches or beats the Illinois state average of Grade D. It ranks #1 of 1 lakes in Williamson County by water quality score.
Water clarity (Secchi depth) sits at 3.2 feet. That falls into moderate clarity — typical for lakes with some nutrient enrichment. Algae levels (chlorophyll-a) measure 22.1 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.
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