Yes. A small rv park on the left as you go toward the beach on Margie Tewmey Road. They are the ones with the palm thatch covered tables. The charge is $15. He isn't always there but responds to text and calls. 361 -- 799 -- 9255.
Love’s in Edna, TX.
Also down by the bay. Indianola Fishing Marina, 8 Bell St, Port Lavaca, TX 77979 will charge you $26 to stay 1 night plus $10 to dump for a total of $36 to dump.
We called around and each time they said go to the marina. We drove our car to the marina, which is much farther than you would think, and decided we would rather wait to dump since we were going elsewhere the next day. Be sure and dump before you get here!