Project
Shutterstock.
Pollution of the Motagua River in Guatemala: The Poqomam Maya people’s quest for environmental justice
The Motagua River basin—Guatemala’s largest and most important river—is severely polluted with wastewater, solid waste, and other types of debris.
This is a cross-border issue because the Motagua’s polluted waters flow into the Caribbean Sea, reach the coast of Honduras, and threaten the Mesoamerican Reef System.
For decades, this has violated the rights to health, water, development, and a healthy environment of all the people living in the river basin.
In June 2025, the Poqomam Maya community of Santa Cruz Chinautla—supported by AIDA, the Indigenous Peoples’ Law Firm, and allied organizations—achieved an unprecedented legal victory to halt degradation in the basin. In response to the lawsuit it filed, a Guatemalan court ordered the municipality of Chinautla to comply with a series of obligations to curb the pollution of the area’s rivers and soil.
The government's response to the ruling has so far been limited to technical working group meetings. Meanwhile, the community continues to work toward the proper implementation of the ruling and to take other actions to defend its territory and its rights.
Background
The Motagua River, which is 486 km long, flows through 96 municipalities and 14 departments in Guatemala. It originates in Quiché, a department located in the northwest, and empties into the Caribbean Sea.
Polluting activities occur throughout the entire basin, including sub-basins and micro-basins. The largest volume of pollution comes from Guatemala City, the country’s capital, and is carried by the waters of the Las Vacas River, which in turn receives a large amount of waste from the Chinautla River.
The Chinautla River, which flows through the municipality of the same name, carries solid waste from a landfill located in Zone 3 of the capital—where trash from at least 14 municipalities in the department of Guatemala is dumped—as well as sewage generated by some 500,000 people living in the northern part of the capital, which undergoes no prior treatment.
Other sources of pollution include the numerous illegal dumps in the municipality of Chinautla, the waste that private vehicles and garbage trucks dump along the banks of its rivers, as well as the sand-mining companies—which began setting up operations in the area between 1996 and 1997—whose activities weaken the rivers' basins, causing solid waste to be more easily carried away by the river currents.
Photo: Mayela Sánchez García.
The situation extends beyond national borders. Every year, the Motagua River discharges some 20,000 metric tons of plastic into the Caribbean Sea, making it one of the rivers that contributes the most plastic pollution to the ocean worldwide, according to estimates contained in a 2025 report by the Inter-American Commission on Human Rights (IACHR).
The river flows into the Mesoamerican Reef at its mouth, so pollution also threatens to degrade one of the largest and most biodiverse transboundary reefs on the planet, which spans the territorial waters of Belize, Guatemala, Honduras, and Mexico.
In addition, the contaminated water reaches the coast of Honduras and spreads into Amatique Bay, located along the eastern coast of Guatemala, affecting the Caribbean Sea.
The roots of this chronic, cross-border problem are structural. Data from the Integrated Environmental Management of the Motagua River Basin project, funded by the United Nations Development Program (UNDP), show that in Guatemala, 66% of municipal solid waste is not collected, and there is no guarantee that the remaining 34% is disposed of properly. Furthermore, of all landfills nationwide, 88.32% are illegal or lack municipal authorization.
In other words, the core issues that need to be addressed are the mismanagement of solid waste and water resources in Guatemala; noncompliance with existing regulations on wastewater discharge and the disposal and treatment of solid waste and residues; and the lack of a water law.
The Poqomam Maya people's quest for justice
The rivers of Santa Cruz Chinautla, a community of the Poqomam Maya people located just twelve kilometers from Guatemala City, have become conduits of pollution that are degrading the Motagua River.
For decades, the local population has seen its health and livelihoods—including pottery, one of the main economic activities and a source of identity—damaged due to the lack of waste management in the municipality of Chinautla and the urban area of the country’s capital, as well as the activities of sand-mining companies.
Photo: Mario Winter.
Voices for the Motagua River: Olga Vázquez.
Voices for the Motagua River: Nazario Pascual.
In early 2000, the Maya community organized to stop sand mining on their territory. At that time, the companies held mining permits that remained valid through 2021 and 2022. And although the permits expired, some companies continued to operate after requesting extensions. In June 2022, the indigenous authorities of the Poqomam people began a sit-in protest in front of the Piedrinera San Luis company, which they maintained for four years.
In July 2024, the Special Rapporteur on Economic, Social, Cultural, and Environmental Rights of the IACHR visited Santa Cruz Chinautla. During his visit, traditional authorities and community members spoke about the environmental, water-related, health, economic, and cultural impacts of the pollution in their rivers.
That same year, in October, the community—with support from AIDA, the Indigenous Peoples’ Law Firm, and partner organizations—filed a lawsuit (petition for amparo) against the municipality of Chinautla over its failure to take measures to address the contamination of its rivers and soil caused by improper solid waste management and the existence of illegal landfills.
AIDA’s scientific team, together with local residents and community authorities, collected key information on illegal landfills in the area. This community science initiative supported the litigation by highlighting the severity of the pollution, demonstrating the ongoing use of such practices, and providing evidence of the municipal authorities’ failure to fulfill their legal obligations regarding waste management.
Learn more about this community science initiative.
In June 2025, the Poqomam community won the support of the Guatemalan justice system when a constitutional court ordered the municipality of Chinautla to effectively address the claims in the lawsuit aimed at stopping the pollution of the rivers and soil in Santa Cruz Chinautla.
This is the first time a Guatemalan court has recognized a community's right to a healthy environment and its central role in finding solutions.
Find out the details of the legal victory.
Current situation
Since the ruling was issued, the municipality of Chinautla has held a series of “technical working groups” with representatives from the central government, civil society, and the community. A smaller group of technical experts was later created to develop a work plan with clear goals. Several months have passed without the municipality convening these working groups.
Furthermore, in December 2025, the IACHR noted in its report Human Rights Situation in Guatemala that the Motagua River basin is facing a severe pollution crisis that has had profound impacts on biodiversity and has resulted in systematic violations of the human rights of local communities, including the Maya Poqomam people.
And in May 2026, the Ministry of the Environment and Natural Resources revoked the license of the sand mining company Piedrinera San Luis for "failure to comply with environmental commitments."
AIDA continues to monitor the implementation of the court ruling to ensure the right to a healthy environment for the Poqomam Maya community and all those living in the Motagua River basin. Meanwhile, the residents of Santa Cruz Chinautla remain organized and mobilized to improve their environment and defend their rights.
Related projects
Plan Colombia Aerial Herbicide Spraying Not Proved Safe for the Environment – Released to US Congress
For Immediate Release February 14, 2007 CONTACTS: Anna Cederstav, AIDA (510) 550-6700 [email protected] Astrid Puentes, AIDA (5255) 52120141 [email protected] PLAN COLOMBIA AERIAL HERBICIDE SPRAYING NOT PROVEN SAFE FOR THE ENVIRONMENT Critique of recent studies by international environmental NGO released to Congress today OAKLAND, CA, MÉXICO, D.F. - In December, the Colombian government violated a bilateral accord with Ecuador by spraying a mixture of herbicides intended to destroy coca crops within 10 kilometers of the Ecuadorian border. To justify the spraying, Colombia relied on studies by a team from the Inter-American Drug Abuse Control Commission (CICAD) of the Organization of American States (OAS), claiming that the spray mixture is safe. However, an independent review of CICAD’s recent studies, released to members of the U.S. Congress today, shows that the pesticide mixture being sprayed has not, in fact, been proven safe for the environment, and that Ecuador has substantial cause to oppose the spraying. According to the Interamerican Association for Environmental Defense (AIDA), the first CICAD Environmental and Human Health Assessment of the Aerial Spray Program for Coca and Poppy Control in Colombia, released in 2005, did not assess many of the greatest potential ecological and human health risks posed by the aerial eradication program in Colombia. Because of these omissions and the potential environmental risk of the spraying, the U.S. Congress requested further studies to better assess whether the mixture is truly safe for the environment. Preliminary results from the follow-up studies, released in August 2006, show that the mixture is indeed potentially harmful to the environment, and particularly to amphibians – the spray mixture killed 50 percent of the amphibians exposed in less than 96 hours. According to Earthjustice scientist and AIDA’s Program Director Anna Cederstav, “Contrary to what is argued by the government, this study shows sufficient cause for concern to suspend the sprayings due to potential environmental impacts, especially considering that Colombia has the second highest amphibian biodiversity in the world and the most threatened amphibian species.” Many other key questions about the environmental impacts of the spraying also remain unanswered, despite the U.S. Congressional mandate to conduct the studies. For example, the State Department has not provided adequate information about the location of and risk to sensitive water bodies and has done nothing to address whether other threatened species are likely to be harmed. Without these determinations, the claim by the Colombian government that it is safe to spray along the Ecuadorian border is misinformed. “Given the number of unanswered questions about the safety of the spraying, and considering the precautionary principle and the international obligation not to cause impacts to the territories of other States, the Colombian government should halt spraying immediately, and instead implement more effective and environmentally safe alternatives for coca eradication,” said Astrid Puentes, AIDA’s Legal Director.
Read moreAIDA critical of Colombian spraying in Ecuadorian border region
AIDA critical of Colombian spraying in Ecuadorian border region The Colombian government is violating a bilateral accord with Ecuador by spraying a mixture of herbicides intended to destroy coca crops within 10 kilometers of the Ecuadorian border. Colombia is relying on studies by a team from the Inter-American Drug Abuse Control Commission (CICAD) of the Organization of American States (OAS) to claim that the spray mixture is safe. AIDA’s independent review of CICAD's recent studies, however, shows that the pesticide mixture being sprayed has not, in fact, been proven safe for the environment, and that Ecuador has substantial cause to oppose the sprayings. The first CICAD Environmental and Human Health Assessment of the Aerial Spray Program for Coca and Poppy Control in Colombia, released in 2005, did not assess many of the greatest potential ecological and human health risks posed by the aerial eradication program in Colombia. The U.S. Congress requested further studies to determine whether the mixture is truly harmful to the environment. Preliminary results from the follow-up studies, released in August 2006, show that the mixture is indeed potentially harmful to the environment, and particularly to amphibians – the spray mixture killed 50 percent of the amphibians exposed within 96 hours. Additionally, the State Department has not provided adequate information about the location of and risk to sensitive water bodies and has done nothing to address whether other threatened species are likely to be harmed. Without these determinations, any claim by the Colombian government that the spray mixture is safe enough to spray along the Ecuadorian border is misinformed.
Read moreAIDA Calls for Alternative Development Programs in Colombia
AIDA Report Highlights Need for Alternative Programs in Colombia After six years of spraying herbicides over large areas of the Colombian countryside under "Plan Colombia," the aerial spraying program has failed to meet the goal of eliminating 50 percent of illicit crops in this country. Despite an investment of nearly US$1.2 billion, and the spraying of more than four times the initial area of coca crops, coca cultivation in Colombia continues, at nearly the same levels as when the program originated. Meanwhile, the spraying continues to cause severe social impacts and pose unknown environmental risk. AIDA has prepared a report analyzing some of the participatory, sustainable, alternative development programs that have proven more effective than aerial spraying. The report recommends that the U.S. and Colombian governments reevaluate the current policy and substantially increase support for such alternatives. The report highlights the need for a comprehensive approach to the problem of illegal crop cultivation, with a strategy that addresses the root-causes of the problem. The report provides detailed information and an analysis of five programs implemented by different actors, all of which can serve as models or provide lessons learned for new programs. Although improvements can still be made, alternative development programs have yielded concrete, positive results and have been far more cost-effective than the spraying program.
Read more