A sample of drinking water systems were selected to participate in the 7th DWINSA that included all large systems (those serving more than 100,000 people), a random sample of medium systems (those serving 3,301 to 100,000 people) for each state, and a national random sample of small systems (those serving 3,300 or fewer people).
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Service lines network in the drinking water sector in the U.S. 2021, by type
Around ** percent of drinking water service lines in small systems (those serving or fewer people) across the United States were lead- and galvanized free service lines as of 2021. Nonetheless, almost ** percent of such lines had an unknown status. When it comes to medium and large drinking water systems, the level of uncertainty grows. Around ** percent of service lines in an average state sample were unknown. In that hypothetical example state, only *** percent of lines were confirmed to be made out of lead.
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Environmental Protection Agency. (September 29, 2023). Distribution of the service line network materials of the drinking water sector in the United States in 2021, by size of system [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 27, 2026, from /statistics/1499405/drinking-water-service-lines-network-usa-by-type/
Environmental Protection Agency. "Distribution of the service line network materials of the drinking water sector in the United States in 2021, by size of system." Chart. September 29, 2023. ÌÇÐÄÆƽâ°æ. Accessed July 27, 2026. /statistics/1499405/drinking-water-service-lines-network-usa-by-type/
Environmental Protection Agency. (2023). Distribution of the service line network materials of the drinking water sector in the United States in 2021, by size of system. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 27, 2026. /statistics/1499405/drinking-water-service-lines-network-usa-by-type/
Environmental Protection Agency. "Distribution of The Service Line Network Materials of The Drinking Water Sector in The United States in 2021, by Size of System." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 29 Sep 2023, /statistics/1499405/drinking-water-service-lines-network-usa-by-type/
Environmental Protection Agency, Distribution of the service line network materials of the drinking water sector in the United States in 2021, by size of system ÌÇÐÄÆƽâ°æ, /statistics/1499405/drinking-water-service-lines-network-usa-by-type/ (last visited July 27, 2026)
Distribution of the service line network materials of the drinking water sector in the United States in 2021, by size of system [Graph], Environmental Protection Agency, September 29, 2023. [Online]. Available: /statistics/1499405/drinking-water-service-lines-network-usa-by-type/
