Grout Pond Outlet
Windham County, VermontView 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
Grout Pond Outlet in Windham County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 7.8 µg/L.
- Phosphorus
- 7.8 µg/L
- Trend
- ↓ Declining
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Watch Grout Pond Outlet’s letter
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Why Grout Pond Outlet 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 Grout Pond Outlet, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
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 VT DEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Grout Pond Outlet is a lake in Windham County, Vermont. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2022-04-01. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Grout Pond Outlet is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Water quality measurements for Grout Pond Outlet
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 7.8 µg/L. TSI 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 7.8 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Grout Pond Outlet
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.087 m/yr | 4 |
| Phosphorus | ↓ Declining | +0.92 µg/L/yr | 4 |
EPA Impairment Status
Grout Pond Outlet is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit VT12-03L01 · Official waterbody report · Matched by proximity (1.09 km)
Graded lakes near Grout Pond Outlet
Grout Pond Outlet has no grade, but these lakes within a short drive do.
Nearby Lakes in Windham County
Frequently asked questions about Grout Pond Outlet
Where is Grout Pond Outlet?
- Grout Pond Outlet is a lake in Windham County, Vermont. 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 Grout Pond Outlet?
- Grout Pond Outlet in Windham County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 7.8 µg/L.
Is Grout Pond Outlet safe to swim in?
- The letter is not a swimming clearance. Grout Pond Outlet is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Explore Grout Pond Outlet across LakeQuality
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Where this data comes from
11 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ11 samples · 2021–2022
Analytical methods
- EPA approved Alternate Test Procedure for 4500 P H. Has a 28 day hold without acid preservation.
- 2120 B ~ Color in Water by Visual Comparison
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