The Navajo Nation says it's waiting for test results from its own environment officials before deciding whether to declare the San Juan River safe for use.
Tribal President Russell Begaye has advised Navajos not to let livestock drink from the river or use the water for crops.
Meanwhile, New Mexico has lifted water restrictions for the Animas and San Juan rivers, and Colorado has reopened the Animas to boating. Utah also has given the OK for San Juan River to be used for crops and livestock.
Begaye spokesman Mihio Manus says the tribe's Environmental Protection Agency is analyzing water samples following a leak of contaminants at a Colorado gold mine. The Aug. 5 spill sent a plume of pollutants downstream into the San Juan River.