Hartford County Lake Quality
Connecticut, 10 lakes, average grade D (Nutrient-rich)
Hartford County has 10 graded 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. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Batterson Park Pond (D); the most-stressed is Batterson Park Pond (D).
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Quick Answers for Hartford County
Planning a trip? Check special fishing regulations for Batterson Park Pond — or check the official Connecticut fishing regulations.
All Lakes in Hartford County
10 lakes · 3 graded, 7 not rated3 graded lakes · 7 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DBatterson Park PondHartford | D | No recent samples | 28 µg/L | 21.6 µg/L | No recent samples | Not recorded |
| 2 | DLake TerramuggusHartford | D | No recent samples | 31 µg/L | 0.9 µg/L | No recent samples | Not recorded |
| 3 | DRainbow ReservoirHartford | D | No recent samples | 50 µg/L | No recent samples | No recent samples | Not recorded |
| NRBarber PondHartford | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRDiamond LakeHartford | NR | 6.6 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRHowells PondHartford | NR | 4.7 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRManitook LakeHartford | NR | 13.9 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRRainbow PondHartford | NR | 6.3 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSilver LakeHartford | NR | 4.4 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWhites PondHartford | NR | No recent samples | 149.5 µg/L | 13.2 µg/L | No recent samples | Not recorded |
NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
Lake Match
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Other Counties in Connecticut
See how Hartford County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.