Lake Zoar
Lake Zoar in Fairfield County, Connecticut has a water quality grade of C (Fair). Phosphorus: 26 µg/L. Chlorophyll-a (algae): 14.9 µg/L.
- Type
- Eutrophic
Lake Zoar is a productive, nutrient-rich eutrophic lake in Fairfield County, Connecticut. Water quality is graded C based on 2 sampling years through 2022. Compared to the 3 other monitored lakes in Fairfield County, Lake Zoar ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-08-16. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyBacteria advisory
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: 26 µg/L. Chlorophyll-a: 14.9 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 26 µg/L | Fair |
| Chlorophyll-a (Algae) | 14.9 µg/L | Not graded |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Zoar
Compare lakeside cabins, hotels, and vacation rentals near Lake Zoar 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.
Top-rated places to stay near Lake Zoar
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Fishing Lake Zoar
EPA Impairment Status
Lake Zoar is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit CT6000-00-5+L2_01 · Official waterbody report · Matched by proximity (1.7 km)
County Ranking
Ranked #2 of 4 lakes in Fairfield County
Nearby Lakes in Fairfield County
Frequently asked questions about Lake Zoar
Where is Lake Zoar?
- Lake Zoar is a lake in Fairfield 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 Zoar?
- Lake Zoar in Fairfield County, Connecticut has a water quality grade of C (Fair). Phosphorus: 26 µg/L. Chlorophyll-a (algae): 14.9 µg/L.
Is Lake Zoar safe to swim in?
- Generally safe for swimming, moderate water quality. Lake Zoar has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 14.9 µg/L. Always check local health department advisories before swimming.
Explore Lake Zoar across LakeGrade
More Connecticut Lake Rankings
Other Grade C Lakes in Connecticut
Eutrophic 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