DR1 Daily News - Dominican Republic

The Hatillo Dam (Presa de Hatillo) in the Dominican Republic is currently facing a severe environmental crisis characterized by an unusual green coloration and high levels of toxicity. Based on the reports and scientific investigations from February 2026, here is a summary of the situation regarding the dam, the pollution, and the role of mining.

Nairobi Viloria for Te Lo Explico looked into the “green water” phenomenon impacting the Hatillo Dam. What is known is that the dam’s water has turned a bright, oily green. Investigative reports by journalist Nairobi Viloria and various scientific institutes (UASD and private laboratories) have identified the primary cause as eutrophication, a process where excess nutrients trigger a massive “bloom” of algae and cyanobacteria. The study reveals a cyanobacteria called Microcystis is dominant. It creates an oily, green layer on...