Stillwater Pond
Barnstable County, MassachusettsView mapDirections
MassDEP publishes the water-quality measurements for Stillwater Pond. Here is what has been measured.
- Eutrophic
- Impaired · Habitat alterations
- Public access
- Limited data
Stillwater Pond in Barnstable County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 9 µg/L.
Stillwater Pond is a productive, nutrient-rich eutrophic lake in Barnstable County, Massachusetts. Limited fish-species data available. Public access is available. Compared to the 7 other monitored lakes in Barnstable County, Stillwater Pond ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2018-08-30. Methodology: how these readings are compared.
Swimming conditions
Readings onlyRecreation use not supported
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. Stillwater Pond is listed impaired under Clean Water Act §303(d) (IR 5) for habitat alterations, turbidity. Check local advisories before you swim.
Whether Stillwater Pond is safe to swim in today is a call for the Massachusetts Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Stillwater Pond
These are the measurements MassDEP publishes for Stillwater 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. Chlorophyll-a 9 µg/L. TSI 52.
| 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 | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 9µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 52 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Answers come straight from the public measurements and survey records on this page.
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Fishing Stillwater Pond
EPA Impairment Status
Stillwater Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Recreation, Other.
Source: EPA ATTAINS assessment unit MA96309 · Official waterbody report
Nearby Lakes in Barnstable County
Frequently asked questions about Stillwater Pond
Where is Stillwater Pond?
- Stillwater Pond is a lake in Barnstable County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Stillwater Pond?
- Stillwater Pond in Barnstable County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Chlorophyll-a (algae): 9 µg/L.
Is Stillwater Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Stillwater Pond is listed impaired under Clean Water Act §303(d) (IR 5) for habitat alterations, turbidity. Check local advisories before you swim.
Can I fish at Stillwater Pond?
- Public access to Stillwater Pond is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Massachusetts's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
3 measurements from 1 monitoring station, 2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Massachusetts Department of Environmental Protection (MassDEP)
MASSDEP3 samples · 2018
Analytical methods
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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