DNR officers are dispatched over the Department of Public Safety system and have also started migration to the Iowa Statewide Interoperable Communication System (ISICS)
https://www.radioreference.com/apps/db/?sid=8734
DNR officers also have the local counties they patrol in their radio and can be heard on the county law enforcement frequencies.
Frequencies
DNR
Areawide frequencies
See Wiki for map
| Frequency | License | Type | Tone | Alpha Tag | Description | Mode | Tag |
|---|---|---|---|---|---|---|---|
| 159.405 | WPFF986 | M | IA DNR Area1 | Western, Southwest, and South Central Iowa | FM | Law Tac | |
| 159.450 | WPFF986 | M | IA DNR Area2 | Northwest Iowa to Southeast Iowa | FM | Law Tac | |
| 159.360 | WPFF986 | M | IA DNR Area3 | Northeast Iowa | FM | Law Tac | |
| 151.355 | WPFF986 | M | IA DNR Area4 | Scott, Muscatine, Cedar, Clinton Counties | FM | Law Tac |