Dallas County Lake Quality
Texas, 2 lakes, average grade D (Poor)
Dallas County has 2 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.
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. White Rock Lake (D) is the cleanest in the county.
Quick Answers for Dallas County
Planning a trip? Check special fishing regulations for White Rock Lake — or check the official Texas fishing regulations.
All Lakes in Dallas County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | White Rock Lake | D | 1.7 ft | 80 µg/L |
Other Counties in Texas
See how Dallas County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 17 states.
Where to stay near Dallas County
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Source: EPA National Aquatic Resource Surveys, 2026.