The primary purpose of the credential is to set a standard of practice and create a baseline of knowledge for onsite wastewater system installations. Iowa counties are encouraged to adopt regulations providing for the certifying of installers and to require the CIOWTS credential. Counties currently requiring the Basic Level CIOWTS credential are Benton, Black Hawk, Bremer, Buchanan, Butler, Cedar, Chickasaw, Dallas, Delaware, Floyd, Grundy, Hardin, Iowa, Jasper, Jones, Linn, Marion, Scott, Story, Warren, Washington, and Winneshiek. Please check with your county sanitarian for specific requirements. As of July 1, 2019 Hamilton County will require the credential with implementation set for January 1, 2020 . Clayton County will require the CIOWTS starting July 1 of 2021.
A pass score of 70% or higher must be achieved to receive the CIOWTS credential. The credential runs on a two-year cycle. During each two year cycle, the credential holder must have a minimum of 12.0 hours of continuing education earned in the onsite wastewater industry. IOWWA has events scheduled throughout the year that provide continuing education approved for the CIOWTS credential. For those taking the Installation Overview course prior to a scheduled test, the 12.0 CE hours earned will be applied to the first two-year cycle.
CIOWTS Test Study Guide: This study guide, published by the Consortium of Institutes for Decentralized Wastewater Treatment, is a 450 page notebook that serves as a self study aid for those interested in testing for the Certified Installer of Onsite Wastewater Treatment Systems (CIOWTS) credential. The handbook is also a valuable office or field reference guide. The study guide can be ordered through Iowa State University, use this link: Installation of Wastewater Treatment Systems Manual.
IOWWA 2019 Member and Non-Member CIOWTS List: To review IOWWA members and non-members who have the CIOWTS credential, please refer to the "CIOWTS Members and Non-Members List" PDF file in the Documents & Files section below