Healthy Homes, Part 9: Plumbing Course

Welcome to InterNACHI's free, online Healthy Homes, Part 9: Plumbing Course. This is part 9 of a 14-part Certified Healthy Homes Inspector certification program. This course is provided by our accredited college at

Take the free online course now.


This course aims to teach students about healthy plumbing systems in homes. Students will gain an overview of various plumbing components and systems.


Upon successful completion of this course, the student will be able to:
  • identify systems and components of plumbing;
  • distinguish between various types of plumbing material;
  • discuss the advantages of hot and cold-water piping;
  • discuss safety guidelines and danger prevention for plumbing systems;
  • identify safety valves and controls;
  • identify drainage components;
  • list ways in which to conserve water and money;
  • perform an inspection related to water supply systems and components; 
  • generate observations related to inspecting water supply systems and water quality; and 
  • produce written reports related to observations conducted at a house.

Course includes:

  • 32 InterNACHI® CE credits
  • 10,535 words
  • 20 quiz questions in four quizzes
  • Inspection and writing assignment
  • Research and writing assignment
  • 30-question final exam
  • Certificate of Completion

You will learn the following topics:

  • Basic elements and definitions of plumbing
  • Water service
  • Hot and cold water main lines
  • Piping materials
  • PVC
  • CPVC
  • Copper
  • Galvanized steel
  • PEX
  • Kitec
  • Poly
  • Polybutylene
  • Hot water safety
  • Water flow controls
  • Shutoff valves
  • Check valves
  • Flow-control valves
  • Relief valves
  • Pressure-reducing valves
  • Altitude valves
  • Foot valves
  • Frost-proof valves
  • Frost-proof hydrants
  • Float valves
  • Miscellaneous switches
  • Water heaters
  • Tankless water heaters
  • Sanitary drainage systems
  • Traps
  • Ventilation
  • Total drainage system
  • Corrosion control
  • Water conservation
  • Saving money
  • EPA tips
  • Putting it all together


Healthy Homes, Part 9: Plumbing Course
Course #4816, Student Catalog 

Student WorkTime CalculationEstimated Clock Hour Time for the Average Student
Attendance for "Seat Time" 1# of minutes of student attendance / 502.1
Participation in Learning Activities 2# of minutes of online student participation / 502.1
Interactivity 3# of minutes of student interactivity / 500.5
Reading the Course Text 4# of words in the course / 100 words per minute / 502.1
Reading the Course Textbook 5# of words in the book / 100 words per minute / 501.0
Academic Engagement 6# of words in the course / 100 / 501.0
Direct Communication 7# of minutes of communication / 500.5
Instructional Video Learning 8# of minutes of video / 500.0
Reinforcement Q & A  9# of questions X 1.85 / 501.1
Writing Assignment of the Inspection  104.0 hours per assignment4.0
Writing Assignment of the Research  114.0 hours per assignment4.0
Academic Activities for an Inspection  128.0 hours for each inspection assignment8.0
Performing an Inspection  138.0 hours for each inspection8.0
Total clock hours
32.0 clock hours
32.0 InterNACHI CE Hours
3.2 CEU

This course has been approved by:

And, in keeping with InterNACHI's commitment to Continuing Education, this online course is open and free to all members and can be taken again and again without limit.

Reminder to members:  InterNACHI's Code of Ethics 1.10 requires that you comply with all government rules and licensing requirements of the jurisdiction where you conduct business.  InterNACHI's courses and Standards generally exceed the Standards of Practice that you are required to abide by locally.