Harveys Lake
Harveys Lake in Grafton County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 89.5 µg/L.
Why Harveys Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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 Harveys Lake, 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 your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Harveys Lake is a lake in Grafton County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-08-10. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Harveys Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 89.5 µg/L. Trophic State Index: 69.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 89.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 69 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Harveys Lake
Compare lakeside cabins, hotels, and vacation rentals near Harveys Lake 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 Harveys Lake
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Fishing Harveys Lake
EPA Impairment Status
Harveys 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 NHLAK801030701-01 · Official waterbody report · Matched by proximity (0.95 km)
Graded lakes near Harveys Lake
Harveys Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Grafton County
Frequently asked questions about Harveys Lake
Where is Harveys Lake?
- Harveys Lake is a lake in Grafton County, New Hampshire. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Harveys Lake?
- Harveys Lake in Grafton County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 89.5 µg/L.
Is Harveys Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Harveys 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 Harveys Lake across LakeGrade
More New Hampshire Lake Rankings
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Top 25 by Secchi water clarity
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Where this data comes from
1 measurement from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ1 sample · 2022
Analytical methods
- EPA approved Alternate Test Procedure for 4500 P H. Has a 28 day hold without acid preservation.
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