Use the link below to find an RV dump site near you.
40 gallon gray tanks & black water tanks (under the van)
Whether you're in Los Angeles or out on the road, you should be able to find free and paid dump locations using rvdumpsites.net.
Just enter your current location and dump sites will populate on the map.
7 gallon gray water tanks (blue tank under the sink)
You can easily remove the blue gray water tank and dump in a standard toilet or sink.