A-Loop does NOT have water hookups at the sites. (Only host site has water) Water fill ups are located at the restrooms. All A-Loop sites also do not have 50 AMP electric. Most of them only have up to 20 or 30 since they were created for tents and small campers. My knowledge comes from being a camp host at the Schoodic woods campground for 3 consecutive years.
I just don't understand none of these campgrounds in Acadia offering showers; millions of dollars invested but people have no where to get clean.. There are other national park campgrounds with pay showers. Perplexing.
Most n National Parks I have visited do not have showers, but in adjoining towns laundrymats seem to offer paid showers. Or not shower and blend in with nature, no friends but a lot of nature.