Originally Posted by 1ciderdog
Several years ago at a campground (RV Park) in BC or Alberta we were told to empty the holding tanks at a dump station before connecting at the full hook up site. They specifically did not want us to dump full tanks at the site. I don't know the specific reason why.
I've seen some parks that require you to empty your tanks at the dump station before going to your site because they have strict regulations regarding formaldehyde in their septic system. Rather than relying on the RV owner knowing what kind of chemicals they use, or having people lie about what chemicals they use, they simply require you to enter with verified empty tanks.
We've even stayed at one park where they provided their own chemical, after you dumped.