(New) Lead Service Line Inventory

Project Overview

The city of Patterson is committed to providing safe drinking water to all its customers by following all State and Federal standards. The State Water Resource Control Board (Water Board), in alignment with the U.S. Environmental Protection Agency (US EPA), enforces the Lead and Copper Rule (LCR). The US EPA recently made changes to the LCR with the Lead and Copper Rule Revisions (LCRR) and will likely make further adjustments by October 2024. To ensure public water systems are reducing lead exposure to their customers, the US EPA is requiring all large public water purveyors to complete a Lead Service Line Inventory (LSL Inventory). The objective of the LSL Inventory is to determine if there are any lead pipes in the water distribution system on both the public and customer (private) portions. This inventory must be completed and submitted by October 16, 2024.

The city is working diligently to meet the October 2024 deadline and will post periodic updates on this project webpage.

Project Details

The city of Patterson has records of the city-owned portion of the water service line and has certified that no lead is present in its system. However, there is little to no information regarding the customer-owned portion of the water service line. After a preliminary inventory of the information that was available, the city will survey approximately 1,866 facilities, all installed before January 1, 1987. 

To determine the material of the water service line, city crew members may perform the following: 

  • Use hand tools to excavate the area in and around the water meter box.
  • Operate excavator trucks to clear out large debris from the meter box. 
  • Perform scratch tests on the pipe to determine the pipe material.
  • Document pipe material with photos.
  • Record pipe material at the water meter box as well as the nearest spigot or hose bib. 

City crew members will be working mostly in the area of the water meter box and the closest water spigot after the meter box. They will not need access to your backyard or inside your home. 

What is a Water Service Line?

The water service line is the pipe infrastructure that supplies water from the City's main to the customer's building. This line begins at the main connection and connects to the building inlet. The city operates and maintains the pipe from the main up to and including the water meter. The customer's responsibility begins after the water meter and all the pipe downstream going towards the home. These water service lines can be made up of several materials such as lead, galvanized steel, copper, or polyvinyl chloride (PVC). A diagram is below. 

Project Timeline

The city began its review and planning stages for this project early 2023 and will continue through October 16, 2024.


City crews will be surveying water service lines throughout the entire City. All progress reports and/or updates will be reported on this page.

Additional Information

For additional details please visit the following links: 

US Environmental Protection Agency Revised Lead and Copper Rule 

State Water Resource Control Board Lead and Copper Rule for Drinking Water