There are four dump stations available near La Grulla, Texas, where you can dump your black and gray water, fill up with fresh water and even flush your tanks.You'll find a waste disposal site, a hose for flushing tanks, and a trash bin at each location.The Rest Area - Medina County Northbound and Southbound are two popular stops along the highway for RVers in need of dumping or filling up their tanks. Alamo River RV Resort offers easy access to its dump station for both guests and non-guests. Braunig Lake RV Resort is another option near La Grulla with a well-maintained dump station.