Lake Mexia is a highly nutrient-loaded hypereutrophic lake in Limestone County, Texas. Water quality is graded F based on 2 sampling years through 2026. Compared to the 1 other monitored lakes in Limestone County, Lake Mexia ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Texas DNR, last sampled 2026-01-13. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.1 ft of visibility. Phosphorus level: 170 µg/L. Chlorophyll-a: 50.7 µg/L. Trophic State Index: 74.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.1 ft | F |
| Phosphorus | 170 µg/L | F |
| Chlorophyll-a (Algae) | 50.7 µg/L | F |
| Trophic State Index (TSI) | 74 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Lake Mexia
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Fishing Lake Mexia
Location
County Ranking
Ranked #2 of 2 lakes in Limestone County
Cleaner Lakes Within 30 Miles
Lake Mexia holds Grade F. 2 nearby lakes hold higher grades.
- CNavarro Mills LakeNavarro County · 22.5 mi · Two grade letters higher (F → C)
- CTradinghouse Creek ReservoirMcLennan County · 24.2 mi · Two grade letters higher (F → C)
Nearby Lakes in Limestone County
Explore Lake Mexia across LakeGrade
More Texas Lake Rankings
Other Grade F Lakes in Texas
Falls County · Clarity: 1.5 ft
Burleson County · Clarity: 1.8 ft
Washington County · Clarity: 0.9 ft
Collin County · Clarity: 1.4 ft
Polk County · Clarity: 1.6 ft
Harris County · Clarity: 1.5 ft
Hypereutrophic Lakes in Texas
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2026-01-13
Monitoring stations: 1