Project #4713

Full Lead Service Line Replacement Guidance

In Progress
Principal Investigator
Research Manager
Mr. Jonathan Cuppett
Cornwell Engineering Group
Lead & Copper
Distribution System Management
Asset Management


Removing the entire lead service line eliminates one significant potential source of lead. However, even after full LSL replacement, lead sources can still be present that can contribute to lead levels at the tap. Following a full LSL replacement, lead exposure can come from lead scale that has built up over time within premise plumbing, brass components that contain lead, and lead based solder.

The objective of this project is to evaluate strategies to reduce lead exposure after conducting full lead service line replacements (FLSLRs). The research will provide accurate and easily understood guidance and reference materials for staff at any U.S. or Canadian water system to use when planning and implementing FLSLRs.

The research team will conduct a literature review of current information related to limiting lead release following lead service line disturbances and evaluate the effectiveness of flushing to reduce lead exposure following FLSLRs at single family homes. The research will also identify lessons learned from case studies, if any are available, of utilities that have monitored lead release following FLSLR.

Participating utilities will conduct field studies at over 100 locations during the course of this project.