[5] This tiny snail lives in the Pecos River basin in eastern New Mexico and western Texas.

It lives in mud and mats of saturated vegetation with small amounts of running water.

[5] Threats to this species and to other invertebrates living in the same habitat include the loss of the water sources that feed the karst cave network.

The springs are also located in active oil and gas extraction regions, and pollution of the water is a threat.

The introduction of the decollate snail (Rumina decollata) is a potential threat, as it could be a predator upon the assiminea.