Skip navigation links
Code Development
Training and Certification
About Us
Industry Links
Contact Us
What's New
Skip navigation links
Members Only
Why Become a Member
How We Help You:Expand How We Help You:
Contact Field Manager
Field Services Assistance
Ask A Code Question
IAPMO Certified Professionals Search
Government Relations
Drought ToolkitExpand Drought Toolkit
Career Center
Uniform Codes Questions & Answers
Water Demand Calculator
2017 Oregon Plumbing Specialty Code
Appeals Decisions 2017
Petition Filed and Council Appeals Decisions
Water Demand Calculator 
Download Water Demand Calculator

Provisions for using the WDC are published in the 2018 UPC and 2017 WEStand appendices. Both documents contain a download link for the WDC.

System Requirements:
The Water Demand Calculator is a Microsoft Office Excel file and requires a compatible version of Excel 2009 or later to prevent loss of functionality. This file also uses active content (macros). When downloading this file, Microsoft Office has security features causing a message bar to appear warning that the active content may contain viruses and other security hazards that could harm your computer or your organization’s network and that the macros have been disabled. This does not mean that viruses have been detected. It only means that active content has been detected and the user is being warned. Since the source file comes from IAPMO, the file can be trusted and the macros can be enabled. You may need to change the settings in the Trust Center on your computer (find this in the Options section of Microsoft Office applications). Once the file is trusted, the warning will no longer appear.

Although care has been taken to ensure the accuracy, completeness and reliability of the Water Demand Calculator (“Calculator”), IAPMO makes no warranties, express or implied, or representations as to the accuracy of the Calculator. IAPMO assumes no liability or responsibility for any error or omissions in the information contained in or output by the Calculator. IAPMO assumes no responsibility for the consequences of use of such information, nor for any infringement of third party intellectual property rights which may result from its use.