Atrazine
pesticide
Runoff from herbicide used on row crops (especially corn). Common in Midwestern surface water, with seasonal spikes after spring application.
EPA regulatory status
Legal limit (MCL)
0.003 mg/L
Goal (MCLG)
0.003 mg/L
MCL 0.003 mg/L (3 ppb). MCLG = 0.003 mg/L.
Health effects
Long-term exposure is associated with cardiovascular-system and reproductive problems.
This is general public-health information, not medical advice — consult your physician with any health concerns.
National violations
28,364
EPA's enforcement data (SDWIS/ECHO) records 28,364 violations of Atrazine's rule nationally.
How to remove Atrazine
Frequently asked questions
What is Atrazine?
Atrazine is a pesticide regulated in US drinking water. Runoff from herbicide used on row crops (especially corn). Common in Midwestern surface water, with seasonal spikes after spring application.
What is the legal limit for Atrazine in drinking water?
MCL 0.003 mg/L (3 ppb). MCLG = 0.003 mg/L.
What health effects does Atrazine have?
Long-term exposure is associated with cardiovascular-system and reproductive problems.
How many violations of Atrazine limits are on record nationally?
EPA's enforcement data (SDWIS/ECHO) records 28,364 violations of Atrazine's rule nationally.
How do I remove Atrazine from my water?
Filter technologies certified to reduce Atrazine include: activated carbon (NSF/ANSI 53), reverse osmosis (NSF/ANSI 58). Look for a filter independently certified against the specific NSF/ANSI standard for this contaminant — general "reduces contaminants" marketing claims are not the same as a contaminant-specific certification.
Source: EPA National Primary Drinking Water Regulations · Data as of 2026-07-16