SIA Represents the Following Carriers

  • AAA Wisconsin
  • AARP
  • Aetna
  • All Savers
  • Allied Insurance
  • American General Life Companies
  • American Modern Insurance
  • Ameritas
  • Anthem Blue Cross and Blue Shield
  • Arise Health Plan
  • Assurant (American Bankers)
  • Assurity Life Insurance
  • Auto-Owners Insurance
  • Banner Life Insurance
  • Coventry Health Care
  • Dairyland Auto
  • Dairyland Cycle
  • Dean
  • Delta Dental Plans Association
  • Flyway Mutual Insurance Company
  • Foremost Insurance
  • Fringe Benefit Group
  • Gerber Life
  • Germantown Mutual
  • Hagerty Insurance
  • Hanover Insurance Group
  • Health Insurance Marketplace
  • Humana, Inc.
  • Jackson National Life
  • John Hancock
  • Kemper Companies
  • Legal & General
  • Lincoln Financial Group
  • MassMutual Financial Group
  • Medico Insurance Company
  • MetLife Home and Auto
  • MetLife Insurance
  • Midwest Family Mutual
  • Molina Healthcare
  • Mutual of Omaha
  • National General Insurance
  • National Guardian Life
  • Network Health
  • One America
  • Pacific Life Insurance
  • Principal Financial Group
  • Progressive Insurance
  • Protective Life Corporation
  • Prudential
  • Safeco Insurance
  • Selective Insurance
  • SilverScript
  • Society Insurance
  • The Guardian Life Insurance Co.
  • The United Fire Group
  • Transamerica Life Insurance
  • United of Omaha
  • UnitedHealthOne
  • UnitedHealthcare
  • Unitrin, Inc.
  • Unity Health Insurance
  • Unum Group
  • VSP
  • Voya Financial
  • WPS Health Insurance
  • West Bend Mutual
  • Sarah Kastein Pieper
    Four stars!
  • Erin Backhaus
    5 stars!
SIA Insurance Services Staff

Wisconsin Independent Insurance Agency

Auto/Car Insurance, Homeowners Insurance, Medicare Supplements, Business/Commercial Insurance, and Life/Health Insurance for Waupun and All of Wisconsin

Founded in 1927 by John D. Westra, SIA has been a family owned agency serving Waupun and the surrounding area for almost 100 years. Today we still have our main office in Waupun and we still have family ownership. We now service accounts throughout the state, as well as their out-of-state operations. We have expanded our business to include agents in Randolph, Jackson, and Greenville, and we are looking forward to continued growth, through the reputation we have established for insurance value and customer satisfaction.

Over the years, we have established long-term relationships with the companies we represent and the customers we are privileged to serve. These are the relationships upon which SIA Insurance Services has been built.

SIA Insurance Services is a full-service independent insurance agency. We will review your needs, analyze your risks, explain the options and offer solutions to your problems.

Joel Sterk

Questions? We Can Help!

Recent News & Updates

Do You Need Business Insurance When Working Out of Your Home?

Many small businesses in the U.S. today are home-based. For a small business owner or entrepreneur, working out of the home has many advantages. It is convenient, cost-effective, and comfortable, and you can skip the daily commute and wear pajamas or sweats all day if you like. However, conducting business in the comfort and convenience of your own home does not make it risk-free. You... Read Article

7 Exclusions to Your Typical Life Insurance Plan

Life insurance is one of the most effective ways to ensure your family is protected. Should you suddenly become incapacitated or pass away, life insurance funds can be paid at once to the named beneficiaries without any concern about taxes or delays related to probate. However, when buying a life insurance policy, the one person who truly has your back is your agent. Every life insurance... Read Article