Section 135K.6 - Enforcement1. The department shall investigate complaints regarding backflow prevention assembly testers. If the department determines that a provision of this chapter regarding the requirements for a backflow prevention assembly tester has been violated, the department may order a person not to test or repair backflow prevention assemblies or may revoke the registration of a registered backflow prevention assembly tester until the necessary corrective action has been taken.2. The department shall investigate complaints regarding courses covering the testing and repair of backflow prevention assemblies. If the department determines that a provision of this chapter regarding approved courses has been violated, the department may revoke the approval of a course until the necessary corrective action has been taken.