Blue Hole Water Quality Test Results
For primary contact recreation, the geometric mean criterion for E. coli is 126 per 100mL. In addition, the single sample criterion for E. coli is 399 per 100 mL. “Primary contact recreation” refers to activities where people come into direct contact with water, like swimming or wading.
These standards are set by the Texas Commission on Environmental Quality. More info here – Texas Surface Water Quality Standards
2025 Water Quality Results (E. coli)
2024 Water Quality Results (E. coli)
May 30, 2024 *higher than usual result due to runoff from 2″+ of rain* – still within safe parameters
June 3, 2024 *a retest was taken after reopening, levels are back down to our usual low result range*
2023 Water Quality Results (E. coli)
| May 3, 2023 | July 5, 2023 |
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