Mill Pond
Barnstable County, MassachusettsView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- Impaired · Oxygen depletion (low DO)
- #8 of 8 in the county
- Public access
- Limited data
Mill Pond in Barnstable County, Massachusetts has a water quality grade of F (Algae-prone). Chlorophyll-a (algae): 30.5 µg/L.
- Type
- Hypereutrophic
- Chlorophyll-a
- 30.5 µg/L
- Public access
- Yes
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Stays near Mill Pond
Compare lakeside cabins, hotels, and vacation rentals near Mill Pond in Barnstable County, Massachusetts — 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Mill Pond are listed below.
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Watch Mill Pond’s letter
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Mill Pond is a highly nutrient-loaded hypereutrophic lake in Barnstable County, Massachusetts. Water quality is graded F 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, Mill Pond ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2018-09-20. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited 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 F is nutrients and algae, not a swimming clearance. Mill Pond is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
No clarity data. Chlorophyll-a 30.5 µg/L. TSI 64. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 30.5 µg/L | Poor |
| Trophic State Index (TSI) | 64 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Fishing Mill Pond
EPA Impairment Status
Mill Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MA96183 · Official waterbody report · Matched by proximity (2.06 km)
County Ranking
Ranked #8 of 8 lakes in Barnstable County
Nearby Lakes in Barnstable County
Frequently asked questions about Mill Pond
Where is Mill Pond?
- Mill Pond is a lake in Barnstable County, Massachusetts. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Mill Pond?
- Mill Pond in Barnstable County, Massachusetts has a water quality grade of F (Algae-prone). Chlorophyll-a (algae): 30.5 µg/L.
Is Mill Pond safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Mill Pond is listed impaired under Clean Water Act §303(d) (IR 5) for oxygen depletion (low DO). Check local advisories before you swim.
Explore Mill Pond across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Massachusetts's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
Massachusetts's cleanest and most-polluted lakes, ranked
Planning a trip around Cape Cod?
Mill Pond is about 14 miles from Cape Cod National Seashore. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Cape Cod →More Massachusetts Lake Rankings
Other Grade F Lakes in Massachusetts
Hypereutrophic Lakes in Massachusetts
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)
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