Lake Massasecum-Generic
Lake Massasecum-Generic in Merrimack County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 9 µg/L.
Why Lake Massasecum-Generic 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 Lake Massasecum-Generic, 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.
Lake Massasecum-Generic is a lake in Merrimack County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-06-22. 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 Lake Massasecum-Generic
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 9 µg/L. Trophic State Index: 36.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 9 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 36 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lake Massasecum-Generic
Compare lakeside cabins, hotels, and vacation rentals near Lake Massasecum-Generic in Merrimack 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 Lake Massasecum-Generic
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Fishing Lake Massasecum-Generic
EPA Impairment Status
Lake Massasecum-Generic 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 NHLAK700030302-04-01 · Official waterbody report · Matched by proximity (0.02 km)
Graded lakes near Lake Massasecum-Generic
Lake Massasecum-Generic has no grade, but these lakes within a short drive do.
Nearby Lakes in Merrimack County
Frequently asked questions about Lake Massasecum-Generic
Where is Lake Massasecum-Generic?
- Lake Massasecum-Generic is a lake in Merrimack 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 Lake Massasecum-Generic?
- Lake Massasecum-Generic in Merrimack County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 9 µg/L.
Is Lake Massasecum-Generic safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Massasecum-Generic is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Lake Massasecum-Generic across LakeGrade
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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
- New Hampshire Department Of Environmental Services (BEACH)
111133001 sample · 2022
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
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