Sag Quarry West Lake
Cook County, IllinoisView mapDirections
Nutrients and algae run above the regional average.
↓ down from C at the last regrade
- Eutrophic
- #9 of 16 in the county
- Limited data
Sag Quarry West Lake in Cook County, Illinois has a water quality grade of D (Nutrient-rich). Water clarity: 4.2 ft visibility. Phosphorus: 65.5 µg/L. Chlorophyll-a (algae): 22.1 µg/L.
- Clarity
- 4.2 ft
- Typical in October
- 54°F
- Type
- Eutrophic
Stays via Stay22
Stays near Sag Quarry West Lake
Compare lakeside cabins, hotels, and vacation rentals near Sag Quarry West Lake in Cook County, Illinois — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Sag Quarry West Lake are listed below.
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Sag Quarry West Lake is a productive, nutrient-rich eutrophic lake in Cook County, Illinois. Water quality is graded D based on 2 sampling years through 2021. Compared to the 15 other monitored lakes in Cook County, Sag Quarry West Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2021-10-26. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Murky, only visible to about 4.2 ft. Phosphorus 65.5 µg/L. Chlorophyll-a 22.1 µg/L. TSI 61. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.2 ft | Not graded |
| Phosphorus | 65.5 µg/L | Poor |
| Chlorophyll-a (Algae) | 22.1 µg/L | Poor |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Water Temperature
Sag Quarry West Lake typically sits around 54°F at the surface in October. Summer average is about 77°F. 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 →
Fishing Sag Quarry West Lake
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.
County Ranking
Ranked #9 of 16 lakes in Cook County
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 grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Sag Quarry West Lake?
- Sag Quarry West Lake in Cook County, Illinois has a water quality grade of D (Nutrient-rich). Water clarity: 4.2 ft visibility. Phosphorus: 65.5 µg/L. Chlorophyll-a (algae): 22.1 µg/L.
Is Sag Quarry West Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Sag Quarry West Lake?
- Sag Quarry West Lake typically sits around 54°F at the surface in October, from 24 EPA Water Quality Portal field readings (2021–2021). That is a typical value for the month, not a live reading.
Explore Sag Quarry West Lake across LakeQuality
More Illinois Lake Rankings
Other Grade D Lakes in Illinois
Eutrophic Lakes in Illinois
Where this data comes from
19 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- illinois epa
IL_EPA_WQX19 samples · 2021
Analytical methods
- MEASURED IN FIELD
- Phosphorus by Colorimetry
- 10200 H 2 ~ Chlorophyll a-b-c Determination by spectrophotometer
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)