Where is Stillwater Pond?

Stillwater Pond is a lake in Barnstable County, Massachusetts. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.

Stillwater Pond

Barnstable County, MassachusettsView map Directions

Good

Clarity, phosphorus, and algae sit in the clean band for this region.

Water temp

No gauge

Clarity

No sample

Level

No gauge

Trend

Not enough history

Eutrophic
Impaired · Habitat alterations
#4 of 8 in the county
Public access
Limited data

See the measurements Directions Where to stay

Stillwater Pond in Barnstable County, Massachusetts has a water quality grade of B (Good). Chlorophyll-a (algae): 9 µg/L.

Type: Eutrophic
Chlorophyll-a: 9 µg/L
Public access: Yes

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Stillwater Pond is a productive, nutrient-rich eutrophic lake in Barnstable County, Massachusetts. Water quality is graded B based on 1 sampling years through 2018. 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. Grade methodology: LakeQuality methodology.

Swimming Safety

Grade only

Limited data

Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.

The B is nutrients and algae, 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.

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Water Quality Grade: B (Good)

No clarity data. Chlorophyll-a 9 µg/L. TSI 52. The letter is not a swimming clearance.

Metric	Value	Grade
Water Clarity (Secchi Depth)	No recent samples
Phosphorus	No recent samples
Chlorophyll-a (Algae)	9 µg/L	Good
Trophic State Index (TSI)	52	Eutrophic

High nutrients, frequent algae, reduced clarity

Fishing Stillwater Pond

→ Stillwater Pond fishing regulations (limits, seasons, special rules)

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

Habitat alterationsTurbidity

Source: EPA ATTAINS assessment unit MA96309 · Official waterbody report

County Ranking

Ranked #4 of 8 lakes in Barnstable County

Nearby Lakes in Barnstable County

NRLovers Lake—View →NRWhite Pond—View →NRGoose Pond—View →NROyster Pond—View →NRBucks Creek Marshes—View →NRMill Pond—View →

Frequently asked questions about Stillwater Pond

Where is Stillwater Pond?: Stillwater Pond is a lake in Barnstable County, Massachusetts. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Stillwater Pond?: Stillwater Pond in Barnstable County, Massachusetts has a water quality grade of B (Good). Chlorophyll-a (algae): 9 µg/L.
Is Stillwater Pond safe to swim in?: The B is nutrients and algae, 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.

Explore Stillwater Pond across LakeQuality

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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)

MASSDEP-W2810

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.