Oasen Plumbing Oasen Plumbing Search | Advanced Search | New Members | Coupons and Discounts | All Categories Other >> Construction/Building Trades Oasen Plumbing 3862 Johns StreetMadison, WI 53714 | View on Google MapsKen Oasen (608) 222-3656 Visit Site Oasen Plumbing Inc. was founded in 1946 by Arthur Oasen. Oasen Plumbing Inc. is still family owned and operated by his two grandsons Ken and Jim Oasen. Member Since: 2018