11/13/2026
Want to know how much nitrate is in your drinking water? You can’t taste it, see it, or smell it. You have to test. 🔍💧
Nitrate Watch volunteers have been doing just that. Catch a glimpse of the drinking water nitrate data reported by Nitrate Watch volunteers so far in 2026.
The US EPA mandates that the maximum allowable nitrate-N concentration for drinking water is 10 mg/L. Well water is not subject to this regulatory standard. Research indicates that a drinking water standard of 10 mg/L may not be sufficiently protective of human health. Adverse health effects have been observed with prolonged exposure to drinking water containing nitrate-N concentrations of 5 mg/L, or even less.
Want to test your water? Join the community science movement. Request a free Nitrate Watch kit at nitratewatch.org.