Sag Quarry-West Lake is a productive, nutrient-rich eutrophic lake in Cook County, Illinois. Water quality is graded D based on 1 sampling years through 2022. Compared to the 67 other monitored lakes in Cook County, Sag Quarry-West Lake ranks #23 for water quality.
Source: EPA Water Quality Portal sampling records, Illinois DNR, last sampled 2022-04-27. 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
Murky, only visible to about 5.5 ft. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.5 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Sag Quarry-West Lake
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Fishing Sag Quarry-West Lake
Location
County Ranking
Ranked #23 of 68 lakes in Cook County
Cleaner Lakes Within 30 Miles
Sag Quarry-West Lake holds Grade D. 2 nearby lakes hold higher grades.
Nearby Lakes in Cook County
Explore Sag Quarry-West Lake across LakeGrade
More Illinois Lake Rankings
Other Grade D Lakes in Illinois
Eutrophic Lakes in Illinois
More records, surveys & data sources
Regulated Pollution Sources Nearby
4 EPA-permitted facilities operate within about 5 miles of Sag Quarry-West Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 2 facilities have a reported Clean Water Act violation in the past three years.
- Dupage County Public Works Knollwood StpBurr Ridge · 1.4 mi away · NPDES IL0065188MajorRecent violation
- Imtt Illinois LlcLemont · 0.9 mi away · NPDES IL0061182Recent violation
- Full Circle TerminalLemont · 0.7 mi away · NPDES IL0080127
- Arkema Lemont FacilityLemont · 0.9 mi away · NPDES IL0002399
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: 2022-04-27
Monitoring stations: 1