Delaware • New Jersey • Pennsylvania
New York • United States of America
DRBC Rule Change:
In 2009, the Delaware River Basin Commission amended its Comprehensive Plan and Water Code to implement an updated water audit approach to identify and control water loss in the Basin. The new approach is consistent with the International Water Association (IWA) and American Water Works Association (AWWA) Water Audit Methodology that is considered a best management practice in water loss control.
The Commission's revised rules require the new reporting format to be used for the 2012 calendar year water audit; however, system operators are encouraged to implement the new audit format in 2011. The new rules are based on precise definitions and rational accounting procedures that result in a clearer understanding of the causes of water loss and allow system operators, utility managers, and regulators better target their efforts to improve water supply efficiency.
Additional information on the DRBC rule change can be found under Useful Links.
Widespread Problem with Large Losses:
Nationwide, an estimated six billion gallons per day of water is taken from water resources and never reaches the customer; this is enough water to supply the drinking water needs of the ten largest cities in the United States. In the Delaware River Basin, this number is estimated at 150 million gallons per day. Water suppliers are experiencing real water losses due to physical infrastructure failures (see photo at right) and apparent losses resulting from inaccurate meter readings and erroneous billing practices. As demand for water increases, it is essential to ensure that water supplies and the infrastructure delivering water are dependable and efficiently move water from source to customer.
In the past, water system audits have been conducted in the absence of consistent definitions and standards and have often used inappropriate metrics for measuring the water supply efficiency. Not surprisingly, some systems bill only half, or less, of the total water they treat, pressurize, and put into the distribution system.
New Approach and Solutions:
By recognizing such problems and proactively seeking best management solutions, the DRBC is one of a handful of regulatory agencies in the United States that has changed its regulations to reflect the improved approach to water loss accounting made possible by the IWA/AWWA methodology. The rule changes approved by the DRBC Commissioners in March 2009 were developed by DRBC staff and the DRBC’s Water Management Advisory Committee (WMAC).
A number of resources are available to assist water system operators in water audits and water loss control. A number of helpful links are posted below:
- Frequently Asked Questions (FAQs) regarding DRBC's Water Audit Reporting Requirements (pdf 270 KB; updated February 2014)
- AWWA’s Free Water Audit Software: The free Water Audit Software operates as a spreadsheet designed in Microsoft Excel format and provides an effective, standardized structure to perform a water audit consistent
with DRBC’s new regulations.
- AWWA’s M36 Manual (3rd edition) Water Audits and Water Loss Control: This recently updated guidance manual covers the steps required to compile the water audit, how to plan and implement a loss control program, and includes case studies of small and large systems.
- DRBC Resolution Changes (pdf 33 KB). A link to a document containing the pertinent changes to DRBC’s Water Code (pdf 1 MB) in reference to Water Audits and Accounting for Water Losses.
- DRBC Notice of Final Rulemaking as appears in the November 20, 2009 Federal Register (pdf 136 KB)
- DRBC Response to Comments Document on Proposed Rule Change (pdf 59 KB; December 2008)
- EPA's Control and Mitigation of Drinking Water Losses in Distribution Systems (pdf 2.8 MB). This guidance document provides information on flexible tools and techniques that may help public water systems (PWS) tailor a program to meet their water loss prevention needs and maintain their infrastructure to deliver clean, safe drinking water to customers.
The Delaware River Basin Commission (DRBC) partnered with the Philadelphia Water Department, NJ American Water, and Aqua Pennsylvania to present a day long workshop, Water System Audits and Water Loss Control, on April 13, 2011. View more information and workshop materials.