Ball Pond
Fairfield County, Connecticut2 acresView mapDirections
CT DEEP publishes the water-quality measurements for Ball Pond. Here is what has been measured.
- Eutrophic
- Impaired · Algal growth
- Public access
- Limited data
Ball Pond in Fairfield County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Phosphorus: 44 µg/L. Chlorophyll-a (algae): 3.3 µg/L. Surface area: 2 acres.
Ball Pond is a 2-acre productive, nutrient-rich eutrophic lake in Fairfield County, Connecticut. Limited fish-species data available. Public access is available. Compared to the 3 other monitored lakes in Fairfield County, Ball Pond ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-06-13. 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. Ball Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Ball Pond is safe to swim in today is a call for the Connecticut Department of Energy and Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Ball Pond
These are the measurements CT DEEP publishes for Ball 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 44 µg/L. Chlorophyll-a 3.3 µg/L. TSI 51.
| 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 | 44µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 3.3µg/L | Measured, not scored 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. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Ball Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
2 acres
Public access
Yes
Listed by CT DEEP
No bathymetric survey has been published for Ball Pond, so its depth is not documented here.
Stays via Stay22
Stays near Ball Pond
Compare lakeside cabins, hotels, and vacation rentals near Ball Pond in Fairfield County, Connecticut — 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 readings cover nutrients and algae, not lodging. Cabins and rentals around Ball Pond are listed below.
Top-rated places to stay near Ball Pond
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Ball Pond’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Ball Pond
Reservoir Info (USACE NID)
Ball Pond is a man-made reservoir impounded by the Merten's Mill Pond Dam, built primarily for recreation on the Ball Pond Brook; earth-type dam, 8 ft tall and 100 ft long.
- Surface area
- 2 ac
- Normal storage
- 0 ac-ft
- Drainage area
- 0.95 sq mi
- Hazard class
- Significant
- Owner
- Carriero
Source: USACE National Inventory of Dams, NID ID CT01114 · Operator website · Matched by proximity (0.87 km)
EPA Impairment Status
Ball 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: Recreation.
Source: EPA ATTAINS assessment unit CT6402-00-1-L1_01 · Official waterbody report
Nearby Lakes in Fairfield County
Frequently asked questions about Ball Pond
Where is Ball Pond?
- Ball Pond is a lake in Fairfield County, Connecticut. Its water-quality measurements are published by CT DEEP and shown on this page as reported.
What is the water quality of Ball Pond?
- Ball Pond in Fairfield County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Phosphorus: 44 µg/L. Chlorophyll-a (algae): 3.3 µg/L. Surface area: 2 acres.
Is Ball Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Ball Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Can I fish at Ball Pond?
- Public access to Ball Pond is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Connecticut's fish and wildlife agency, so check its current regulations before you go.
Explore Ball Pond across LakeQuality
More lakes in Connecticut
Other Lakes in Connecticut
Eutrophic Lakes in Connecticut
Where this data comes from
10 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Connecticut Department Of Energy And Environmental Protection
CT_DEP01_WQX10 samples · 2023
Analytical methods
- Total Phosphorus After Block Digestion
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Nitrate-Nitrite Nitrogen by Colorimetry
- Turbidity by Nephelometry
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