Greenpeace report finds widespread fecal contamination in Yucatan drinking water

OPA WIRE, Oct 21 (OPA) — Greenpeace commissioned independent laboratory testing in August across 17 sites, including household wells, community water points, and cenotes—the region's natural limestone sinkholes. Results showed that 16 of the 17 samples reached the upper limit for total coliform bacteria, while 13 samples hit the maximum threshold for fecal coliforms. Because the Yucatan lacks surface rivers, the area relies entirely on groundwater, which is highly susceptible to contamination due to the region's porous limestone bedrock.

While initial tests could not distinguish between human and animal waste, subsequent analysis using the Pig2Bac DNA marker method confirmed the presence of pig fecal matter in samples. These tests were conducted by laboratories at Johns Hopkins University and the National Autonomous University of Mexico (UNAM). Greenpeace is now calling for an immediate moratorium on new industrial livestock operations and the expansion of existing farms, citing the threat to local communities that rely on these aquifers for drinking, cooking, and bathing.

A July report from the United Nations identified more than 500 industrial pig farms in the Yucatan housing over 50,000 animals, many situated near Indigenous territories. Marcos Orellana, a former UN special rapporteur, stated that waste from these facilities enters the water supply rapidly, noting that many farms operate without proper permits. Conversely, Antonio Zumarraga of the Yucatan Citizen Scientific Water Observatory argued that the industry has invested in treatment systems and blamed government inaction for the ongoing environmental crisis.

Local authorities and the national water commission, CONAGUA, have not yet provided formal responses to the findings. The Merida Association of Pig Farmers also declined to comment on the report’s allegations. As the debate over industrial regulation continues, Maya communities are joining environmental advocates in demanding that state and federal officials address the systemic pollution of the peninsula's primary freshwater source.