King William County Lake Quality
Virginia, 1 lakes, average grade D (Poor)
Only 1 lakes in King William 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. On average, King William County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.
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. Cohoke Millpond (D) is the cleanest in the county.
Quick Answers for King William County
Planning a trip? Check special fishing regulations for Cohoke Millpond — or check the official Virginia fishing regulations.
All Lakes in King William County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Cohoke Millpond | D | - | 65 µg/L |
Other Counties in Virginia
See how King William County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near King William County
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Source: EPA National Aquatic Resource Surveys, 2026.