Tap water safety: 1 in 5 people may drink nitrate contaminants

Key Points:

• Over 62 million Americans, about 1 in 5, may be exposed to potentially harmful nitrate levels in their tap water, with more than 6,000 community water systems testing at or above 3 milligrams per liter, a level linked to health issues including pediatric cancers.
• Current federal nitrate safety standards, set in 1962 at 10 milligrams per liter, are outdated, as recent studies show health risks at much lower levels, prompting the Environmental Working Group to create a detailed nitrate exposure map searchable by zip code.
• High nitrate contamination is especially prevalent in groundwater systems sourced from wells, often due to agricultural runoff involving nitrogen-rich fertilizers and livestock manure, affecting both small rural communities and large cities like Des Moines, Los Angeles, and Fresno.
• Mitigating nitrate contamination requires costly treatment systems for public water utilities, while consumers are advised to use reverse osmosis filtration on kitchen taps for safe drinking water, as bottled water is less regulated and not recommended as a primary solution.
• Experts emphasize the need for updated regulations and increased public awareness, with consumers encouraged to check local water quality via the EWG database and consider filtration options for health protection.