The Onsite Wastewater Assistance Program (OSWAP) offers low interest loans through participating lenders to homeowners for the replacement of inadequate or failing septic systems. According to Iowa law, all septic systems, regardless of when they were installed, must have a secondary wastewater treatment system following the septic tank.

  • Applicants must own an existing home with a septic system in an area not served by a public sewer.
  • Approved systems include both a septic tank and secondary treatment system such as a leach field.
  • Obtain a septic construction permit from county sanitarian.
  • Complete an OSWAP approval form.
  • Apply for a loan through a participating lender. Please note, lenders may become a participating lender by following the simple steps provided here.
  • Hire a septic contractor to complete the approved project.
Loan Terms:
  • Loan amounts start at $2,000
  • Terms up to 10 years
  • Can fund up to 100% of actual costs
  • The interest rate charged to the borrower will not exceed 3%
  • Applications accepted on an ongoing basis
  • Available through the lender of your choice
Program Resources
Application Information

I was surprised by how affordable my payments were with 3% interest over 10 years. OSWAP is a very convenient, affordable and easy program that I would recommend to anyone.
Mark Feller - Borrower
Program Contacts

Borrower Contact:
Cory Frank
Iowa Department of Natural Resources

Lender Contact:
Water Quality Team
Iowa Finance Authority