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Water Supply Cross-Connection Control

COURSE NO: M04-010
Water Supply Cross-Connection Control
Course Highlights

This online engineering PDH course describes some of the basic principles of plumbing cross connections.  The document provides multiple examples of cross-connection illustrations and provides a discussion of the cause of flow reversal and suggested corrective actions.   In addition there is a discussion of the various cross-connection prevention methods and devices that can be used to prevent backflow.


Plumbing cross-connections, which are defined as actual or potential connections between a potable and non-potable water supply, constitute a serious public health hazard.  There are numerous, well documented cases where cross-connections have been responsible for contamination of drinking water, and have resulted in the spread of disease.  The problem is a dynamic one, because piping systems are continually being installed, altered, or extended.  Control of cross-connections is possible, but only through thorough knowledge and vigilance. Education is essential, for even those who are experienced in piping installations fail to recognize cross-connection possibilities and dangers.


This 4 PDH online course is applicable to engineers who work with plumbing systems where cross connection between potable and non-potable systems is a concern.

Learning Objectives

This PE continuing education course is intended to provide you with the following specific knowledge and skills:

  • Public health significance of cross-connections
  • Theory of backflow and backsiphonage
  • Methods and devices for the prevention of backflow and backsiphonage
  • Testing procedures for backflow preventers
  • Administration of a cross-connection control program
  • Cross-connection control ordinance provisions
Course Document

In this professional engineering CEU course, you need to review the material contained in the Cross-Connection Control Manual Environmental Protection Agency, EPA 816-R-03-002, February 2003.

To view, print and study the course document, please click on the following link(s):
Water Supply Cross-Connection Control (1.6 MB)
Course Quiz
Once you complete your course review, you need to take a multiple-choice quiz consisting of twenty (20) questions to earn 4 PDH credits.  The quiz will be based on this EPA publication.
The minimum passing score is 70%. There is no time limit on the quiz, and you can take it multiple times until you pass at no additional cost.
Certificate of Completion

Upon successful completion of the quiz, print your Certificate of Completion instantly. (Note: if you are paying by check or money order, you will be able to print it after we receive your payment.) For your convenience, we will also email it to you. Please note that you can log in to your account at any time to access and print your Certificate of Completion.

To buy the course and take the quiz, please click on: