Precipitation samples are collected at one location on the Idaho National Laboratory (INL) Site: the Experimental Field Station (EFS). Precipitation is collected from offsite locations at Atomic City, Howe and Idaho Falls. Idaho Falls samples are collected monthly. Atomic City, EFS and Howe locations are observed weekly and sampled when there is sufficient volume (125 ml) for analysis.

The Idaho Falls station is operated as part of the Environmental Protection Agency (EPA) Environmental Radiation Ambient Monitoring System (RadNet) program.

Precipitation samples are used as a means of detecting airborne tritium. The current locations were selected to correspond with atmospheric moisture locations for comparison of tritium results.

Precipitation Sampling Map