Pest Organisms / Eastern Subterranean Termite
Signs
for Eastern Subterranean Termite
The sign you are most likely to spot is the mud (shelter) tube — UC IPM ranks these the infestation evidence people notice most often, and Maryland describes them as roughly 1/4-inch-wide dirt tunnels (sometimes wider) on foundations, along bare wood, or hanging from ceilings. Source: https://ipm.ucanr.edu/home-and-landscape/subterranean-and-other-termites/ Source: https://extension.umd.edu/resource/termites
Per Missouri, a lot of swarmers indoors is a definite sign the building is infested. Source: https://extension.missouri.edu/publications/g7420