Flat Mountain Ponds
Flat Mountain Ponds in Grafton County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 28 acres.
- Area
- 28 acres
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Why Flat Mountain Ponds 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 Flat Mountain Ponds, 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.
Flat Mountain Ponds is a 28-acre lake in Grafton 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 Flat Mountain Ponds
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 Flat Mountain Ponds
Compare lakeside cabins, hotels, and vacation rentals near Flat Mountain Ponds in Grafton 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 Flat Mountain Ponds
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 28 acres |
No bathymetric survey has been published for Flat Mountain Ponds, so its depth is not documented here.
Fishing Flat Mountain Ponds
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Frequently asked questions about Flat Mountain Ponds
Where is Flat Mountain Ponds?
- Flat Mountain Ponds is a lake in Grafton 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 Flat Mountain Ponds?
- Flat Mountain Ponds in Grafton County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 28 acres.
Is Flat Mountain Ponds safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Flat Mountain Ponds is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Flat Mountain Ponds across LakeQuality
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Where this data comes from
Measurements for Flat Mountain Ponds come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.