Expect to pay anywhere from $600 to $4,200 to install a whole house water filter. You will pay between $5,000 and $15,000 to purchase and install a commercial grade system. The type, number of stages of filtration, and how many gallons a filter can clean will impact the final price for the system. The prices range from $300 to $3,500. Don’t forget to add materials and labor, which cost from $300 to $700.