Address: 2516 NE 26th Ave Fort Lauderdale , FL 33305 Phone: (754) 218-9141 Category: Water filter supplier Description: The average cost of a water softener is around $3000 for a base model, but some of the larger models the companies offer can cost as much as $8,000 or more. Your tech should test the water and measure the size of your home, check on the number of faucets you have and find out how many people there are in your household. If you have a larger than a normal house or have more contaminants, you’ll need a larger water softener.