Grayson County Lake Quality
Texas, 8 lakes — no lake here has enough monitoring data for a grade
Grayson County has 8 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. No lake in Grayson County has enough sampling behind it for an A–F grade yet. The 8 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.
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.
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Quick Answers for Grayson County
Planning a trip? Check special fishing regulations for Lake Texoma — or check the official Texas fishing regulations.
All Lakes in Grayson County
8 lakes · 0 graded, 8 not rated0 graded lakes · 8 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NRLake TexomaGrayson | NR | 0.4 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSherman Country Club LakeGrayson | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLoy LakeGrayson | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRWaterloo LakeGrayson | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRRandell LakeGrayson | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRR and G Club LakeGrayson | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRMeadow PondGrayson | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRHuff LakeGrayson | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
Lake Match
Which lake suits how you actually use one?
Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in Texas
See how Grayson County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.