Find RV dump sites at RVDumps.com or RVDumpStations.info. To find RV dump sites with a smartphone, download a mobile app at Appcrawlr.com. This website features suitable apps for different devices, and some of them are free.
At RVDumps.com, click on a state in the list on the main page, and then browse through the listing to find a dump nearby station. Typically, a listing includes the address, phone number and the price for a one-time use of the service.
At SaniDumps.com, type a ZIP code in the second search box down on the main page, and then click the search icon to display a listing. Each listing typically includes the address, geographic coordinates and the price for a single use. Click the green SMS button on the left side of a listing to text message the coordinates to your cellphone.
At Appcrawlr.com, type "RV dumps" in the search box near the top of the main page, select your mobile device type from the drop-down menu to the right of the search box, and then click the Go button to display apps. To search for free apps only, click the Free checkbox beneath the Price heading near the top-left of the page. As of November 2015, free apps include Sanidumps RV Dump Station Locator for iPhone and RV Dump Stations Locator for Android.