Northwood Lake-Blodgett
Northwood Lake-Blodgett in Rockingham County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 132 µg/L.
Why Northwood Lake-Blodgett 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 Northwood Lake-Blodgett, 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.
Northwood Lake-Blodgett is a lake in Rockingham County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-09-16. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedBacteria advisory
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Northwood Lake-Blodgett
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 132 µg/L. Trophic State Index: 75.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 132 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 75 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Northwood Lake-Blodgett
Compare lakeside cabins, hotels, and vacation rentals near Northwood Lake-Blodgett in Rockingham 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 Northwood Lake-Blodgett
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Fishing Northwood Lake-Blodgett
EPA Impairment Status
Northwood Lake-Blodgett is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700060502-08-01 · Official waterbody report · Matched by proximity (0.28 km)
Graded lakes near Northwood Lake-Blodgett
Northwood Lake-Blodgett has no grade, but these lakes within a short drive do.
Nearby Lakes in Rockingham County
Frequently asked questions about Northwood Lake-Blodgett
Where is Northwood Lake-Blodgett?
- Northwood Lake-Blodgett is a lake in Rockingham 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 Northwood Lake-Blodgett?
- Northwood Lake-Blodgett in Rockingham County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 132 µg/L.
Is Northwood Lake-Blodgett safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Northwood Lake-Blodgett is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Northwood Lake-Blodgett across LakeGrade
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Where this data comes from
1 measurement from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133001 sample · 2020
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