Debunking the Myth: Human Waste as Fertilizer in Mexico

No credible evidence supports the claim that Mexicans systematically use human waste on crops. This is a persistent myth—often rooted in prejudice or confusion with historical/other cultural practices.

Actual Agricultural Practices in Mexico

• Chemical fertilizers dominate commercial agriculture (urea, ammonium phosphate, NPK).
• Animal manure (cattle, pig, poultry) widely used in smallholder/organic systems.
• Compost & vermicompost growing in sustainable/organic sectors.
• Treated wastewater (reclaimed water) used for irrigation in water-scarce regions (e.g., Mezquital Valley) – not raw sewage; regulated by NOM-001/003-SEMARNAT.

Sanitation Context

• Mexico has near-universal sanitation access (94%+ improved facilities, WHO/UNICEF).
• Wastewater treatment coverage ~60% (improving); sludge management regulated.
• Night soil (bucket latrine) collection largely eliminated since 1970s.

Where the Myth May Originate

• Historical: Pre-Columbian chinampas used nutrient-rich lake sediment (not human waste).
• Global confusion: "Night soil" used historically in China, Japan, Korea, Europe – not uniquely Mexican.
• Border rhetoric: Anti-immigrant tropes weaponize sanitation stereotypes.

Food Safety Reality

Mexico exports $40B+ agricultural products to US annually (avocados, berries, tomatoes, tequila). Subject to FDA FSMA, USDA APHIS, SENASICA certification. Zero outbreaks linked to human waste fertilization.

Bottom Line

The claim is false, offensive, and contradicted by data. Modern Mexican agriculture uses standard global inputs; wastewater reuse is treated, regulated, and distinct from "human waste on plants."