No dump station but right by the restrooms there’s a hose to fille up your fresh water tank east access and in the restrooms a place to do your dishes

No but you are allowed to use the dump down the road at Midway Campground with no problem - There is also fresh water spigot at Midway - easy to get in and out

There is one advertised on their website here - https://www.nps.gov/bicy/planyourvisit/monument-lake-campground.htm, but I didn't look for it or use it, so I don't know details.

There is not. Fresh water that you can fill jugs with but no place to fill tanks or empty. If memory serves me correctly about 7 miles west of the campground is a dump station with potable water. It's free as long as you're staying at one of the campgrounds. It was very easy in and out and clean.

No but you can dump at Midway which is east of Monument Lake.

I believe there is... another dump station for sure is just down the road to the east at Midway campground. Midway, in my opinion is the nicer of the two campgrounds although both have their good points.