Umbagog Lake
Umbagog Lake in Coos County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 7642 acres.
- Area
- 7,642 acres
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Why Umbagog 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 Umbagog Lake, no water-quality sampling on record for this lake.
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 your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Umbagog Lake is a 7,642-acre lake in Coos County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Umbagog Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Umbagog Lake
Compare lakeside cabins, hotels, and vacation rentals near Umbagog Lake in Coos County, New Hampshire — 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.
Top-rated places to stay near Umbagog Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 7,642 acres |
No bathymetric survey has been published for Umbagog Lake, so its depth is not documented here.
Fishing Umbagog Lake
Nearby Lakes in Coos County
Frequently asked questions about Umbagog Lake
Where is Umbagog Lake?
- Umbagog Lake is a lake in Coos County, New Hampshire. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Umbagog Lake?
- Umbagog Lake in Coos County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 7642 acres.
Is Umbagog Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Umbagog Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Umbagog Lake across LakeQuality
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Where this data comes from
Measurements for Umbagog Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.