Sag Quarry West Lake is a productive, nutrient-rich eutrophic lake in Cook County, Illinois. Water quality is graded C based on 2 sampling years through 2021. Compared to the 67 other monitored lakes in Cook County, Sag Quarry West Lake ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, Illinois DNR, last sampled 2021-10-26. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 4.2 ft. Phosphorus level: 52.5 µg/L. Trophic State Index: 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.2 ft | D |
| Phosphorus | 52.5 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Sag Quarry West Lake
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Fishing Sag Quarry West Lake
Water Temperature
Sag Quarry West Lake averages about 77°F at the surface in summer, usually warmest in Jun (about 77°F) and coldest in Oct (about 54°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 24 field readings (2021–2021) via the EPA Water Quality Portal. See the full Sag Quarry West Lake water temperature breakdown →
Location
County Ranking
Ranked #14 of 68 lakes in Cook County
Nearby Lakes in Cook County
Explore Sag Quarry West Lake across LakeGrade
More Illinois Lake Rankings
Other Grade C Lakes in Illinois
Eutrophic Lakes in Illinois
More records, surveys & data sources
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Sag Quarry West Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Imtt Illinois - Lemont FacilityLemont · 0.9 mi away · NPDES IL0005126Recent violation
- Meno Stone Co IncLemont · 0.1 mi away · NPDES IL0065137
- Holy Family Villa StpLemont · 1.8 mi away · NPDES IL0024678
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2021-10-26
Monitoring stations: 1