A few ideas
Search for the city of Springdale, AR here:
Digital Frequency Search
Enter the frequencies as NXDN and wildcard them as you will not find the specific settings online because NXDN for scanner users is so new. Call Whistler and ask for Bryan at 866-923-8719. DO NOT take the frequencies for Springdale NXDN off of RR!! They are not updated or correct at all. Ask Bryan to show you how to enter these freqs as NXDN with wildcard settings. It will work but then you will have to isolate which freqs are fire, police, city admin, sanitation, etc.
If I can do this, ANYONE CAN....
Best wishes!!