Zebra mussels pose a significant threat to lakes, altering ecosystems and harming native species. The Texas Parks and Wildlife Department has elevated the status of Fort Phantom Hill Lake to "infested" after additional monitoring. This designation indicates an established, reproducing population of invasive mussels in the lake. The lake initially received a "positive" designation in September 2025 after initial detections. Further testing, including DNA lab analysis of plankton samples, confirmed the presence of zebra mussel larvae.

The infestation status was updated following these findings. For more information, details are available from the source.