FMC magazine, January 2009
The following is a directory of public sanitation facilities, or dump stations, located throughout the United States. Dump stations at privately operated campgrounds are not included. Check your favorite campground directory for details about those facilities.
Note that entrance fees are charged at some National Park System sanitation facilities, as well as at some state-operated dump stations.
FMCA’s Membership Department compiled the directory by contacting the appropriate agencies in all 50 states. If you have information about additional facilities, or encounter facilities that have closed, contact Margaret Keen at the national office, 1-800-543-3622.
As of January 2009, here is the most comprehensive list that could be compiled. It is organized by state:
Directory of Sanitary Disposals (PDF)