Halls Pond
Tolland County, Connecticut20 acresView mapDirections
CT DEEP publishes the water-quality measurements for Halls Pond. Here is what has been measured.
- Mesotrophic
- Limited data
Halls Pond in Tolland County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Phosphorus: 15.5 µg/L. Chlorophyll-a (algae): 3.5 µg/L. Surface area: 20 acres.
Halls Pond is a 20-acre mesotrophic lake in Tolland County, Connecticut. Compared to the 3 other monitored lakes in Tolland County, Halls Pond ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-08-09. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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. Check local advisories before you swim.
Whether Halls 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 Halls Pond
These are the measurements CT DEEP publishes for Halls 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 15.5 µg/L. Chlorophyll-a 3.5 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 | 15.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 3.5µg/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. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Halls Pond
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Lake Details
Surface area
20 acres
No bathymetric survey has been published for Halls Pond, so its depth is not documented here.
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Fishing Halls Pond
Reservoir Info (USACE NID)
Halls Pond is a man-made reservoir impounded by the Halls Pond Dam (completed 1920), built primarily for recreation on the CONAnT BROOK; earth-type dam, 22 ft tall and 633 ft long.
- Surface area
- 20 ac
- Normal storage
- 216 ac-ft
- Max storage
- 216 ac-ft
- Drainage area
- 4.12 sq mi
- Hazard class
- Significant
- Owner
- Buccino, Jr.
Source: USACE National Inventory of Dams, NID ID CT00645 · Operator website
Nearby Lakes in Tolland County
Frequently asked questions about Halls Pond
Where is Halls Pond?
- Halls Pond is a lake in Tolland County, Connecticut. Its water-quality measurements are published by CT DEEP and shown on this page as reported.
What is the water quality of Halls Pond?
- Halls Pond in Tolland County, Connecticut has water-quality measurements published by CT DEEP, shown here as reported. Phosphorus: 15.5 µg/L. Chlorophyll-a (algae): 3.5 µg/L. Surface area: 20 acres.
Is Halls Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Halls Pond across LakeQuality
More lakes in Connecticut
Other Lakes in Connecticut
Mesotrophic Lakes in Connecticut
Where this data comes from
14 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- Connecticut Department Of Energy And Environmental Protection
CT_DEP01_WQX14 samples · 2022
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.