White Oak Pond
Grafton County, New Hampshire295 acresView mapDirections
NHDES publishes the water-quality measurements for White Oak Pond. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
White Oak Pond in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 14.5 µg/L. Surface area: 295 acres.
White Oak Pond is a 295-acre mesotrophic lake in Grafton County, New Hampshire. Compared to the 26 other monitored lakes in Grafton County, White Oak Pond ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-08-17. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. White Oak Pond is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Whether White Oak Pond is safe to swim in today is a call for the New Hampshire Department of Environmental Services and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for White Oak Pond
These are the measurements NHDES publishes for White Oak Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 14.5 µg/L. TSI 43.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 14.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about White Oak Pond
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Lake Details
Surface area
295 acres
No bathymetric survey has been published for White Oak Pond, so its depth is not documented here.
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Fishing White Oak Pond
Reservoir Info (USACE NID)
White Oak Pond is a man-made reservoir impounded by the White Oak Pond Dam (completed 1920), built primarily for recreation on the White Owl Brook; earth-type dam, 8 ft tall and 50 ft long.
- Surface area
- 295 ac
- Normal storage
- 684 ac-ft
- Max storage
- 976 ac-ft
- Drainage area
- 4.58 sq mi
- Hazard class
- Low
- Owner
- TOWN OF HOLDERNESS
Source: USACE National Inventory of Dams, NID ID NH00463 · Operator website
EPA Impairment Status
White Oak Pond is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700010501-05 · Official waterbody report
Nearby Lakes in Grafton County
Frequently asked questions about White Oak Pond
Where is White Oak Pond?
- White Oak Pond is a lake in Grafton County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of White Oak Pond?
- White Oak Pond in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 14.5 µg/L. Surface area: 295 acres.
Is White Oak Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. White Oak Pond is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Explore White Oak Pond across LakeQuality
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Mesotrophic Lakes in New Hampshire
Where this data comes from
17 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
1111330017 samples · 2020–2025
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database