Water Community Consulting that Delivers Beyond the Ordinary

We are the team you can turn to when you face a critical, unusual, or difficult challenge and may not even know where to start

Our team of engineers, data professionals, economists and communication strategists is dedicated to finding solutions to complex issues for which no well-defined solution may currently exist. We never sell canned answers; we take a scientific approach to developing solutions that meet our clients' unique needs.

EPA Approves Denver Water’s Request for Alternative Treatment Technique for National Primary Drinking Water Lead and Copper Regulations

Corona Environmental Consulting assisted Denver Water in obtaining this first-of-its-kind EPA approved variance by analyzing data, creating models, and performing experimental research that substantiated Denver Water’s approach to achieving Lead and Copper Rule compliance.  Denver Water began implementing the Lead Reduction Program (LRP) in 2020.  The LRP is a lead management strategy that directly addresses the source of the lead with accelerated lead service line replacements, while simultaneously avoiding the long-term watershed impacts of orthophosphate addition.  To address lead concerns while the lead service lines are being replaced, Denver Water is providing filters certified to remove lead to all customers with known or suspected lead service lines.  To address long-term control of lead from other sources, Denver Water is increasing pH and alkalinity.  The Corona team modeled the system-wide lead concentrations of LRP conditions versus orthophosphate (designated as Optimal Corrosion Control Treatment) to demonstrate equivalency between the approaches.  The Equivalency Model will be used in the future to determine regulatory compliance and the success of the LRP.  CEC also assisted Denver Water in experimental design and analysis of their lead pilot rack, coupon testing, and lead filter testing. Additionally, CEC developed a data-driven model to help identify lead service lines in the system and estimate the total number of lead service lines, as well as many other Tech Memos to support the variance.

For more information, visit Denver Water’s LRPP information site.

We are here to help your utility prepare for the Lead and Copper Rule Revision (LCRR)

Drs. Sheldon Masters, Tim Bartrand and Chad Seidel explored implications of the proposed LCRR trigger level in an upcoming Journal American Water Works Association article. We have been given permission by the American Water Works Association (AWWA) to post this article, which will appear in the November edition of the Journal AWWA.

Click on Water Glass to Access Journal Article