Second Sister Lake
Washtenaw County, Michigan8 acresView 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
- Limited data
Second Sister Lake in Washtenaw County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 8.1 acres.
- Area
- 8 acres
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Watch Second Sister Lake’s letter
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Why Second Sister 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 Second Sister 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 EGLE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Second Sister Lake is a 8-acre lake in Washtenaw County, Michigan. The lake supports 3 documented fish species including Bluegill, Green sunfish, and Yellow bullhead.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-03-20. Grade methodology: LakeQuality methodology.
What Second Sister Lake is good for
From access and monitoring records, not editorial picks.
- Fishing3 species recorded
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Second Sister Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Water quality measurements for Second Sister 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 |
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 8 acres |
No bathymetric survey has been published for Second Sister Lake, so its depth is not documented here.
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Second Sister Lake
EPA Impairment Status
Second Sister Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040900050308-02 · Official waterbody report
Regulated Pollution Sources Nearby
15 EPA-permitted facilities operate within about 5 miles of Second Sister Lake under Clean Water Act (NPDES) discharge permits. 8 facilities have a reported Clean Water Act violation in the past three years.
- Gelman Sciences Llc - Wagner RdAnn Arbor · 0.3 mi away · NPDES MI0048453Recent violation
- Washtenaw Cdc MS4Ann Arbor · 2.6 mi away · NPDES MI0059599Recent violation
- Honey Creek Development WwtpAnn Arbor · 3 mi away · NPDES MI0058169Recent violation
- Lake Forest GolfAnn Arbor · 3.4 mi away · NPDES MIG580015Recent violation
- Ntn Technical CenterAnn Arbor · 3.9 mi away · NPDES MIG250419Recent violation
- Thetford Llc-DexterDexter · 4.4 mi away · NPDES MI0036951Recent violation
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 Second Sister Lake
Second Sister Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Washtenaw County
Frequently asked questions about Second Sister Lake
Where is Second Sister Lake?
- Second Sister Lake is a lake in Washtenaw County, Michigan. 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 Second Sister Lake?
- Second Sister Lake in Washtenaw County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 8.1 acres.
Is Second Sister Lake safe to swim in?
- The letter is not a swimming clearance. Second Sister Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
What fish are in Second Sister Lake?
- Fish species found in Second Sister Lake include Bluegill, Green sunfish, Yellow bullhead. Second Sister Lake is located in Washtenaw County, Michigan.
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Where this data comes from
1 measurement from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS1 sample · 2022
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)