WHO urged to review drinking water standards amid nitrate health fears
Summary
- A joint letter from leading scientists and health experts has called on the WHO to revise its drinking‑water nitrate guideline.
- Global surface‑water models estimate that several hundred million people are currently exposed to nitrate concentrations above the existing WHO limit.
- Elevated nitrate intake is linked to health risks such as methemoglobinemia in infants and potential carcinogenic effects.
- The current WHO guideline permits a maximum of 50 mg/L nitrate (as NO3-) in drinking water, a value many argue is outdated.
- The letter urges the WHO to adopt stricter limits and to incorporate recent epidemiological evidence in its next review cycle.
Key Facts
- · WHO's existing nitrate guideline: 50 mg/L (as nitrate ion).
- · Hundreds of millions worldwide face nitrate levels exceeding this limit.
- · High nitrate exposure can cause methemoglobinemia, especially in infants.
- · Long‑term exposure is associated with increased risk of certain cancers.
- · Scientists request the WHO to incorporate newer toxicological data in its standards.
Why it matters
Safe drinking‑water standards are critical for public health; revising nitrate limits can prevent illness, guide national water‑policy reforms, and influence regulatory frameworks across countries.
#WHO#drinking water#nitrate#public health#environmental standards#water quality