Since we're trash talking here

When I bought my park July '07 one of the first things I did was suspend park provided dumpsters and told residents to contract with our local gargage company for service. It’s worked well until recently. A few residents have had their trash service suspended due to lack of payment. I’m going to start writing 30 day notices on this. I will ask an attorney if I can require each resident to be signed up with the local garbage company

or can I only require them to keep their trash in approved containers ( because some people haul their own trash to the dump to save a few bucks.

Thoughts ?