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States with the most lead service lines (LSL) in the United States as of July 2021 (in 1,000s)

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Source

Release date

August 2021

Region

United States

Survey time period

2021

Supplementary notes

* States that have submitted updated lead service line (LSL). Figures for states that did not provide estimates were estimated based on a water industry self survey in 2016.
Figures are high estimates.
Values have been rounded.

Citation formats

Estimated number of lead pipes in the United States 2021, by state

Published by ÌÇÐÄÆƽâ°æ Research Department, May 8, 2023
Illinois was estimated to have the most lead service lines (LSL) in the United States as of 2021, at more than ** units. Ohio was also estimated to have more than ** LSLs at the time. Drinking water from lead pipes can have harmful health effects to humans, and a high enough exposure to this metal can result in death. New lead pipes were banned at a federal level in the United States in 1986, but as many as ** million are estimated to still be in use across the country.
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