BackflowNear Test-Due Reminder

Becoming a certified backflow tester in Missouri

Rule requires written and hands-on exams including Missouri backflow rule questions, provided by the ABPA Tester Certification Program or ASSE, and the provider must notify the department.

Sources read October 6, 2026. Each section links the pages it came from.

Getting certified in Missouri

Tester certification is valid for 3 years and may be renewed; recertification is also valid for 3 years.

DNR publication PUB2016: ABPA and ASSE written exams contain about 100 questions; course instructors may not test their own students. No minimum course hours stated in rule.

A tester listed with ABPA or ASSE may be certified by the department after passing a Missouri rules exam.

Sources: Exam: written and performance exam from ABPA or ASSE, with Missouri-specific questions; Written exam about 100 questions, proctored by third party

Common questions

Who certifies backflow testers in Missouri?

Rule requires written and hands-on exams including Missouri backflow rule questions, provided by the ABPA Tester Certification Program or ASSE, and the provider must notify the department.

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