Skip to main content

Lead and Copper Testing Overview

Every three years, the Williamsport Municipal Water Authority (WMWA) is required by the U.S. Environmental Protection Agency’s Lead and Copper Rule to conduct a lead and copper survey of our drinking water system.

Lead and copper enter drinking water mainly from the corrosion of plumbing materials that contain lead and copper. When water comes in contact with lead pipes or lead solder, leaching of lead may occur. This reaction is called corrosion. Corrosion is more likely to occur if the water contains high dissolved oxygen, low pH (acidic), and low mineral content. The WMWA has an active and extensive corrosion control program in place in order to prevent corrosion from occurring in its distribution system.

The most recent study was completed in August 2022 and measured lead and copper concentrations in water collected from customers’ taps throughout WMWA’s distribution area. Results show that the WMWA’s water quality continues to meet all State and Federal standards.

All results except for one were below the EPA action level for lead, and all samples were below the EPA’s action level for copper. These results support the effectiveness of the WMWA corrosion control program. 90th Percentile Lead Results for each required sampling event can be seen on the graph below, showing that lead concentrations continue to be reported below the action level of 15 parts per billion for lead.

More information about Drinking Water and Lead can be found on our website at