- You'll find several options for dumping your black and gray water near Spring Valley Lake, California RV Rentals.- The nearest dump station is located at Mojave Narrows Regional Park in San Bernardino County.- Victorville Shady Oasis Kampground is another option with facilities for fresh water, a hose for flushing tanks, and waste disposal.- Elks Lodge and Lone Wolf Colony Health Ranch are also popular choices for RVers looking to properly dispose of their waste. - Most dump stations offer trash bins and additional amenities such as propane filling stations, making it convenient to take care of all your needs in one stop.