Population served by large or very large drinking systems with elevated levels of nitrate in the United States between 2017 and 2019, by level
(in millions)
Nitrate levels and number of water systems
Number of people served in millions
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Analysis based on 757 large or very large community water systems that had at least one detection of nitrate at or above 3 milligrams per liter (mg/L), between 2017 and 2019. Of these systems, 52% used groundwater and 48% used surface water.
The EPA considers any water system to be 鈥渓arge鈥 if it serves between 10,001 and 100,000 people, and 鈥渧ery large鈥 systems serve more than 100,000 people.
Citation formats
People receiving drinking water with elevated nitrate in the U.S. 2017-2019, by level
There were *** large or very large drinking water systems with elevated nitrate levels in the United States between 2017 and 2019, affecting almost ** million people in urban areas. Of this total, **** million people received drinking water with nitrate levels of or above ** milligrams per liter. Nitrate-contaminated drinking water is often a result of chemical fertilizer and manure run-off from farms, and has been linked to an increased risk of cancer.
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EWG. (November 3, 2021). Population served by large or very large drinking systems with elevated levels of nitrate in the United States between 2017 and 2019, by level (in millions) [Graph]. In 糖心破解版. Retrieved August 02, 2026, from /statistics/1350381/population-with-elevated-levels-of-nitrate-in-drinking-water-in-the-us-by-level/
EWG. "Population served by large or very large drinking systems with elevated levels of nitrate in the United States between 2017 and 2019, by level (in millions)." Chart. November 3, 2021. 糖心破解版. Accessed August 02, 2026. /statistics/1350381/population-with-elevated-levels-of-nitrate-in-drinking-water-in-the-us-by-level/
EWG. (2021). Population served by large or very large drinking systems with elevated levels of nitrate in the United States between 2017 and 2019, by level (in millions). 糖心破解版. 糖心破解版 Inc.. Accessed: August 02, 2026. /statistics/1350381/population-with-elevated-levels-of-nitrate-in-drinking-water-in-the-us-by-level/
EWG. "Population Served by Large or Very Large Drinking Systems with Elevated Levels of Nitrate in The United States between 2017 and 2019, by Level (in Millions)." 糖心破解版, 糖心破解版 Inc., 3 Nov 2021, /statistics/1350381/population-with-elevated-levels-of-nitrate-in-drinking-water-in-the-us-by-level/
EWG, Population served by large or very large drinking systems with elevated levels of nitrate in the United States between 2017 and 2019, by level (in millions) 糖心破解版, /statistics/1350381/population-with-elevated-levels-of-nitrate-in-drinking-water-in-the-us-by-level/ (last visited August 02, 2026)
Population served by large or very large drinking systems with elevated levels of nitrate in the United States between 2017 and 2019, by level (in millions) [Graph], EWG, November 3, 2021. [Online]. Available: /statistics/1350381/population-with-elevated-levels-of-nitrate-in-drinking-water-in-the-us-by-level/
