Extended Sentinel Sampling

The Extended Sampling Program is a continuation of the original Sentinel Sampling Program that uses a smaller pool of participants (170 or so).  It also includes sampling only once a month. 
The Extended Sentinel sampling program is focused on areas most likely to have high levels of lead and/or copper. 

All the homes with known lead service lines were encouraged to continue participation.

The Extended Sentinel sites were selected based on homes with one or more of the following criteria:
  • Lead service lines
  • Service lines replaced under the "Fast Start" pilot service line replacement program
  • High lead results for copper or galvanized lines during the original sentinel sampling    
  • Areas with predicted elevated blood lead levels
  • Homes built between 1983-1988 when lead solder was use more frequently with copper interior plumbing