
Below 15, the level that requires action
2 public water companies list Umatilla as a place they supply. The biggest is the Umatilla Water Works (2 Wps), with about 3,948 people. The highest latest result among Umatilla's water companies is 1.5 parts per billion, at the Umatilla Water Works (2 Wps). None of the 2 with results was above 15 at its latest test.