Middlesex County Lake Quality
New Jersey, 4 lakes, average grade B (Good)
Only 4 lakes in Middlesex County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. East Brunswick Community Park Lake (A) is the cleanest in the county.
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Quick Answers for Middlesex County
Planning a trip? Check special fishing regulations for East Brunswick Community Park Lake — or check the official New Jersey fishing regulations.
All Lakes in Middlesex County
4 lakes · 3 graded, 1 not rated3 graded lakes · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | AEast Brunswick Community Park LakeMiddlesex | A | 10.2 ft | 18.9 µg/L | 5.4 µg/L | No recent samples | Not recorded |
| 2 | CDuhernal LakeMiddlesex | C | 4.6 ft | 64 µg/L | 4.4 µg/L | No recent samples | Not recorded |
| 3 | CNew Market PondMiddlesex | C | 3.2 ft | 141.5 µg/L | 4.6 µg/L | No recent samples | Not recorded |
| NRLake CreightonMiddlesex | NR | 2.5 ft | 156 µg/L | 18.4 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.
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Other Counties in New Jersey
See how Middlesex 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.