Sag Quarry-West Lake
Cook County, IllinoisView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Sag Quarry-West Lake in Cook County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar.
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Watch Sag Quarry-West Lake’s letter
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Why Sag Quarry-West Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Sag Quarry-West Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Illinois EPA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Sag Quarry-West Lake is a lake in Cook County, Illinois.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2022-04-27. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Sag Quarry-West Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Fishing Sag Quarry-West Lake
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.
Graded lakes near Sag Quarry-West Lake
Sag Quarry-West Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Cook County
Frequently asked questions about Sag Quarry-West Lake
Where is Sag Quarry-West Lake?
- Sag Quarry-West Lake is a lake in Cook County, Illinois. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Sag Quarry-West Lake?
- Sag Quarry-West Lake in Cook County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Sag Quarry-West Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Sag Quarry-West Lake across LakeQuality
More Illinois Lake Rankings
Other Lakes in Illinois
Where this data comes from
1 measurement from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Illinois Water Science Center
USGS-IL1 sample · 2022
Analytical methods
- Secchi disk method
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)