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Clay - The Permanent Solution

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Most of the materials on this site are available without registering, but if you register we’ll keep you up-to-date with the latest developments in research and our newest publications. Register now to request a hydraulic calculator, download the current NCPI Engineering Manual or

request an educational seminar.

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For information about purchasing pipe, please contact one of our member-companies.


About NCPI


The National Clay Pipe Institute (NCPI) is a not-for-profit technical resource for design, installation and operation of vitrified clay pipe (VCP) gravity sewer systems. 


VCP is the most sustainable pipe available for gravity flow wastewater systems. With unmatched structural integrity, the longest service life available, naturally environmentally friendly raw materials and regional production facilities, clay pipe is enjoying renewed interest among civil engineers.


For the last 4,000 years clay has been the preferred option for sewer pipe material.  One of the earliest industries to work with ASTM, clay pipe manufacturers were instrumental in establishing manufacturing and installation standards more than 100-years ago.  This rich history provides an unmatched level of expertise.



As an organization NCPI is responsible for the development of leak free, factory applied compression joints and the air pressure test to verify the performance of those joints. Specific installation methods and practices were developed by NCPI over years of research to insure the longest service life of any available material.


The National Clay Pipe Institute is an unsurpassed technical resource offering educational seminars on a variety of subjects (with PDH’s available depending on local regulations).  We continue our strong tradition of scholarly research by partnering with universities and municipalities in field research projects designed to address specific concerns.


For more information about the National Clay Pipe Institute, our training seminars or research projects, please contact Jeff Boschert at 314/229-3789 or


For more information about the history of sewers, visit


NCPI National Office:

N6369 US Hwy 12, Suite A

Elkhorn, WI  53121


©  2019 National Clay Pipe Institute. All rights reserved

Information provided on this website is informational only and should not be substituted for the guidance of a qualified professional.