History of Lead in Drinking Water

The use of lead in plumbing dates back thousands of years. Ancient civilizations such as the Romans extensively used lead for piping, believing it to be a durable and malleable material. Over the centuries, lead continued to be used in plumbing systems due to its ease of use and resistance to corrosion.

In the United States, lead pipes were widely used in plumbing systems throughout the 20th century, particularly in urban infrastructure and older homes. Lead was also commonly used in solder for joining pipes and fittings together.

By the early 20th century, awareness of the health risks associated with lead exposure increased. Lead poisoning, particularly in children, was linked to various health problems, including developmental delays, learning disabilities, and behavioral issues. This led to efforts to reduce lead exposure from various sources, including drinking water.

In response to growing concerns, regulations and standards were established to limit the allowable lead content in plumbing materials. In 1986, the United States implemented a ban on the use of lead in plumbing materials to reduce lead exposure in drinking water. This regulation aimed to prevent lead leaching from pipes and fixtures. Although the ban improved water safety, older buildings may still have lead plumbing.

The Environmental Protection Agency (EPA) has been regulating lead in drinking water for over 30 years, with major improvements taking effect in 2024.

EPA Regulations - 1991 to 2024

• The Lead and Copper Rule (LCR) is the National Primary Drinking Water Regulation first promulgated in 1991 that requires actions by public water systems to reduce levels of lead and copper in drinking water.
• In 2021, the EPA promulgated the Lead and Copper Rule Revisions (LCRR), and the deadline for water systems to comply with these revised requirements is October 16, 2024.
• The EPA published the final Lead and Copper Rule Improvements (LCRI) with an effective date of December 30, 2024. 
• The final LCRI mandates full replacement of all lead service lines across the country within 10 years, regardless of current lead levels in the water, among other sampling and public education requirements. The clock begins ticking three years after the LCRI compliance date of November 1, 2027, requiring all lead and certain galvanized service lines to be replaced by December 31, 2037.