Quiver Lake
Mason 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.
- Impaired · Mercury
- Public access
- Limited data
Quiver Lake in Mason County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 140 µg/L.
- Chlorophyll-a
- 140 µg/L
- Public access
- Yes
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Watch Quiver Lake’s letter
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Why Quiver 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 Quiver Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded algae (chlorophyll-a), but not water clarity and phosphorus.
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.
Quiver Lake is a lake in Mason County, Illinois. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2023-07-17. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Quiver Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pesticides. Check local advisories before you swim.
Water quality measurements for Quiver Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Chlorophyll-a 140 µg/L. TSI 79.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 140 µg/L | Not graded |
| Trophic State Index (TSI) | 79 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Fishing Quiver Lake
EPA Impairment Status
Quiver Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit IL_WDL · Official waterbody report · Matched by proximity (2.26 km)
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Quiver Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 4 facilities have a reported Clean Water Act violation in the past three years.
- Dynegy Midwest Generation LlcHavana · 4.4 mi away · NPDES IL0001571MajorRecent violation
- Bradford Stp, Village OfBradford · 2.5 mi away · NPDES IL0022195Recent violation
- Idot Spoon River Rest Area - StpElba Township · 2.5 mi away · NPDES IL0064505Recent violation
- Havana Stp, City OfHavana · 4.1 mi away · NPDES IL0023388Recent violation
- Havana Coal Transfer FacilityHavana · 1.4 mi away · NPDES IL0070882
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 Quiver Lake
Quiver Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Mason County
Frequently asked questions about Quiver Lake
Where is Quiver Lake?
- Quiver Lake is a lake in Mason 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 Quiver Lake?
- Quiver Lake in Mason County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 140 µg/L.
Is Quiver Lake safe to swim in?
- The letter is not a swimming clearance. Quiver Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pesticides. Check local advisories before you swim.
Explore Quiver Lake across LakeQuality
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Hypereutrophic Lakes in Illinois
Where this data comes from
2 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Illinois Water Science Center
USGS-IL2 samples · 2023
Analytical methods
- Plant pigments, sonication & 445
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)