Lake Waramaug
Lake Waramaug in Litchfield County, Connecticut has a water quality grade of C (Fair). Phosphorus: 23 µg/L. Chlorophyll-a (algae): 10.9 µg/L. Surface area: 658 acres.
- Area
- 658 acres
- Type
- Eutrophic
Lake Waramaug is a 658-acre productive, nutrient-rich eutrophic lake in Litchfield County, Connecticut. Water quality is graded C based on 2 sampling years through 2023. Compared to the 11 other monitored lakes in Litchfield County, Lake Waramaug ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-08-03. 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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 23 µg/L. Chlorophyll-a: 10.9 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 23 µg/L | Fair |
| Chlorophyll-a (Algae) | 10.9 µg/L | Not graded |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Waramaug
Compare lakeside cabins, hotels, and vacation rentals near Lake Waramaug in Litchfield 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 Lake Waramaug
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 658 acres |
No bathymetric survey has been published for Lake Waramaug, so its depth is not documented here.
Fishing Lake Waramaug
Reservoir Info (USACE NID)
Lake Waramaug is a man-made reservoir impounded by the Lake Waramaug Dam, built primarily for recreation on the East Aspetuck River; masonry-type dam, 3 ft tall and 50 ft long.
- Surface area
- 658 ac
- Normal storage
- 1,974 ac-ft
- Max storage
- 3,290 ac-ft
- Drainage area
- 14.4 sq mi
- Hazard class
- Significant
- Owner
- Town of Washington
Source: USACE National Inventory of Dams, NID ID CT01650 · Operator website
EPA Impairment Status
Lake Waramaug 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 CT6502-00-1-L2_01 · Official waterbody report · Matched by proximity (1.36 km)
County Ranking
Ranked #9 of 12 lakes in Litchfield County
Nearby Lakes in Litchfield County
Frequently asked questions about Lake Waramaug
Where is Lake Waramaug?
- Lake Waramaug is a lake in Litchfield County, Connecticut. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Waramaug?
- Lake Waramaug in Litchfield County, Connecticut has a water quality grade of C (Fair). Phosphorus: 23 µg/L. Chlorophyll-a (algae): 10.9 µg/L. Surface area: 658 acres.
Is Lake Waramaug safe to swim in?
- Generally safe for swimming, moderate water quality. Lake Waramaug has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 10.9 µg/L. Always check local health department advisories before swimming.
Explore Lake Waramaug across LakeGrade
More Connecticut Lake Rankings
Other Grade C 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)
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