Fairfield County Lake Quality
Connecticut, 9 lakes, measured by CT DEEP
Fairfield County has 9 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. 4 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. The county's readings sit in the middle of the Connecticut range, with one or two lakes pulling the average up or down depending on year.
The county's lakes lean shallow, which makes the readings sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest measured lake is Saugatuck Reservoir.
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Quick Answers for Fairfield County
Planning a trip? Check special fishing regulations for Saugatuck Reservoir — or check the official Connecticut fishing regulations.
All Lakes in Fairfield County
9 lakes · 4 ranked on readings, 5 without enough sampling4 lakes ranked on readings · 5 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|
| 1 | Saugatuck ReservoirFairfield | No recent samples | 10 µg/L | 5.9 µg/L | No recent samples | Not recorded |
| 2 | Lake ZoarFairfield | No recent samples | 26 µg/L | 14.9 µg/L | No recent samples | Not recorded |
| 3 | Ball PondFairfield | No recent samples | 44 µg/L | 3.3 µg/L | No recent samples | ✓ Public |
| 4 | Lake KenosiaFairfield | No recent samples | 50 µg/L | 17.4 µg/L | No recent samples | ✓ Public |
| Fox Hill LakeFairfield | 3.5 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| Lake CandlewoodFairfield | 8.6 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Lake NaranekaFairfield | 4.9 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| Mamanasco LakeFairfield | No recent samples | 42 µg/L | 15.1 µg/L | No recent samples | ✓ Public | |
| Squantz PondFairfield | 8.2 ft | No recent samples | No recent samples | No recent samples | ✓ Public |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
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Source: the Connecticut Department of Energy and Environmental Protection. See data sources.