Washington 4 Hour Industry-Related Plumbing (IRP) Course

  • 4 Hour Course
  • 3.6 38 Reviews
  • $39.00

This class is a four-hour exploration of industry-related plumbing topics. This class is intended to assist journey level and residential specialty plumbers in Washington with renewing their professional licenses.

As of July 2021, the DLI has increased the total number of hours of continuing education hours required for renewals for Washington plumbers. Effective July 1, 2021, all journey level and residential specialty renewals will require 24 hours of continuing education (CE) consisting of:

  • A minimum of 12 hours of Uniform Plumbing Code (an increase of 4 hours);
  • [Note: The 12 hours must be based on the currently adopted UPC and amendments as adopted by the state building code council].
  • A minimum of 4 hours of Industry-Related Electrical content (unchanged); and
  • 8 hours of additional CE on any code or plumbing industry-related topic (an increase of 4 hours.

The total number of hours of CE is increased from 16 hours per renewal to 24 hours.

This course focuses on three general areas of instruction. The first lesson addresses sanitary drainage systems. The second lesson talks about graywater systems. The final lesson is concerned with private onsite sewage systems or OSS.

The lesson on sanitary drainage systems is a fairly comprehensive overview of the topic.

  • This lesson starts with an examination of the basic elements that make up a sanitary drainage system.
  • The lesson then talks about what goes into installing a sanitary drainage system.
  • From there, the lesson looks at codes and standards that apply to sanitary drainage systems.
  • Then, this lesson explores some technical considerations including issues of sanitation.
  • After that, this lesson discusses other types of sanitary drainage systems.
  • This lesson closes by addressing how grease interceptors are used with sanitary drainage systems.

The lesson on graywater systems addresses the design, implementation and maintenance of these kinds of systems.

  • Much like the previous lesson, this lesson begins by covering the core principles of graywater systems.
  • A portion of this lesson looks at how graywater systems are designed and installed.
  • The last portion of this lesson is mainly concerned with how plumbing codes govern graywater systems.

The third lesson of the course discusses private onsite sewage systems (OSS).

  • One portion of this lesson talks about the important aspects of OSS.
  • The other portion of this lesson examines how OSS are designed and installed.

At the end of the course, students will be required to complete a 140 question exam that is intended to promote comprehension and retention of the material.


  • Approved By: Washington Department of Labor & Industries

Instructor Bio

Randy Drake Profile

Randy Drake is a licensed, master plumber with over 32 years' experience in the industry. He founded a plumbing business in 1993 which he successfully sold in 2013. He currently works for a plumbing company based in Traverse City, Michigan.

Course Reviews

38 Reviews