Billings Lake
Billings Lake in New London County, Connecticut has a water quality grade of B (Good). Phosphorus: 16 µg/L. Chlorophyll-a (algae): 1.6 µg/L. Surface area: 105.1 acres.
- Area
- 105 acres
- Type
- Oligotrophic
- Public access
- Yes
Billings Lake is a 105-acre cold, clear oligotrophic lake in New London County, Connecticut. Water quality is graded B based on 2 sampling years through 2022. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 9 other monitored lakes in New London County, Billings Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-06-30. Grade methodology: LakeGrade methodology.
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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.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
No clarity data. Phosphorus level: 16 µg/L. Chlorophyll-a: 1.6 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 16 µg/L | Good |
| Chlorophyll-a (Algae) | 1.6 µg/L | Not graded |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Billings Lake
Compare lakeside cabins, hotels, and vacation rentals near Billings Lake in New London 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.
Top-rated places to stay near Billings Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 105 acres |
| Public Access | Yes |
No bathymetric survey has been published for Billings Lake, so its depth is not documented here.
Recreation & Access
- Billings LakePublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Billings Lake
Reservoir Info (USACE NID)
Billings Lake is a man-made reservoir impounded by the Billings Lake Dam (completed 1900), built primarily for recreation on the Billings Brook; earth-type dam, 12 ft tall and 75 ft long.
- Surface area
- 105.1 ac
- Normal storage
- 577 ac-ft
- Max storage
- 577 ac-ft
- Drainage area
- 0.7 sq mi
- Hazard class
- Significant
- Owner
- Connecticut DEEP
Source: USACE National Inventory of Dams, NID ID CT00571 · Operator website
EPA Impairment Status
Billings Lake 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 CT1001-00-1-L1_01 · Official waterbody report · Matched by proximity (2.17 km)
County Ranking
Ranked #1 of 10 lakes in New London County
Nearby Lakes in New London County
Frequently asked questions about Billings Lake
Where is Billings Lake?
- Billings Lake is a lake in New London County, Connecticut. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Billings Lake?
- Billings Lake in New London County, Connecticut has a water quality grade of B (Good). Phosphorus: 16 µg/L. Chlorophyll-a (algae): 1.6 µg/L. Surface area: 105.1 acres.
Is Billings Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Billings Lake has a water quality grade of B (Good). Algae concentration (chlorophyll-a) is 1.6 µg/L. Always check local health department advisories before swimming.
Are there boat ramps on Billings Lake?
- Billings Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Billings Lake. Public access is listed as yes.
Explore Billings Lake across LakeGrade
More Connecticut Lake Rankings
Other Grade B Lakes in Connecticut
Oligotrophic Lakes in Connecticut
Where this data comes from
20 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_WQX20 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)
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
Named boat-access points from the USGS National Boat Ramps inventory