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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.
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Motagua River: A story of contamination and a call for justice
The Motagua River, Guatemala's largest river, is severely polluted with sewage, solid waste, and other types of waste.It flows into the Caribbean Sea, so contamination reaches those waters, as well as the Mesoamerican Barrier Reef System - the world's largest transboundary reef - and the Honduran coast, causing unquantifiable social and environmental damage.Polluting activities occur throughout the river basin, including sub-basins and micro-basins.In general terms, the contamination has deteriorated the health and violated the right to water, development and a healthy environment of all the people living in the basin.The contamination of the Motagua is a problem that has been going on for decades and requires urgent long-term measures that contribute to the sanitation and integrated management of the river basin.Where is the Motagua River?The Motagua River is one of the main rivers in Guatemala. With a length of 486 km, it crosses 96 municipalities and 14 departments of the country. It originates in Quiché, a department located in the northwest, and flows into the Caribbean Sea.It is at its mouth that its flow meets the Mesoamerican Reef, which extends for approximately 1,000 km and covers the territorial waters of Belize, Guatemala, Honduras and Mexico. Thus, the pollution carried by the river deteriorates the health of the reef system, which is home to the second longest barrier reef in the world.The Mesoamerican Reef protects thousands of kilometers of coastline from currents, waves and storms. In addition to being a breeding and feeding ground for a great diversity of species, it is a carbon dioxide sink and a detoxifier of water and air. The ecological and economic health of the entire South Atlantic area depends on its conservation.In addition, pollution from the Motagua River reaches the coast of Honduras and spreads to Amatique Bay, located along the eastern coast of Guatemala and Belize. This is clearly a transboundary problem.Where does the pollution in of the Motagua River come from?The largest volume of contamination of the Motagua River comes from Guatemala City, the capital of the country, mainly through the waters of the Las Vacas River, which receives a large amount of solid waste from the Chinautla River, as well as sewage that is discharged into its waters on a daily basis.Solid waste from the Chinautla River, which flows through the municipality of the same name, comes from a landfill located in Zone 3 of the capital. Any small landslide in this landfill generates waste that is automatically dumped into the river at any time of the year.The pollution that the Chinautla river carries also consists of a large amount of sewage, generated by at least 500,000 people living in the northern part of Guatemala City, which does not receive any previous cleaning treatment.In the municipality of Chinautla there are numerous illegal landfills. In addition, many private vehicles and collection trucks dump waste on the banks of the Chinautla and Las Vacas rivers.According to data from the Integrated Environmental Management of the Motagua River Basin project, financed by the United Nations Development Program (UNDP), it is estimated that 66% of urban solid waste in Guatemala is not collected and there is no guarantee that the remaining 34% is properly disposed of. In addition, of the total number of landfills in the country, 88.32% are illegal or do not have municipal authorization.Most of the waste is dumped in streams and/or on surfaces that are susceptible to dragging, ending up in one way or another in water sources, such as the Motagua basin.In other words, the main source of contamination of the Motagua River is the poor management of solid waste and water resources in the country; the lack of compliance with existing regulations on wastewater discharge, disposal and treatment of waste and solid waste; as well as the lack of a water law.Who is affected by the contamination of the Motagua River?The contamination of the Motagua River affects the entire population of Guatemala. In the lower basin, it directly affects people dedicated to fishing, who have seen their catches reduced.And, by harming tourism in the Caribbean, it also affects the communities that depend on tourism for their livelihoods.As a basin-wide problem, the contamination of the Motagua affects those living in the main sub-basins and micro-basins of the river, including the indigenous communities of the Mayan Poqomam people in the cities of Chuarrancho and Chinautla.In Chinautla, the contamination affects the living conditions, health, environment, water sources, economy and culture of more than 18,000 people.The restoration of the Motagua River is crucial to improve the quality of life of at least 30% of the Guatemalan population, as well as those affected in neighboring countries.Actions to rescue the Motagua River from contaminationIn the face of the serious degradation of Guatemala's largest river basin, the damage to key ecosystems such as the Mesoamerican Reef, and the human rights violations that pollution generates, urgent measures are required, among them:Verify compliance with environmental and municipal regulations, as well as prevent and halt environmental damage at the source through regulation, monitoring, supervision and oversight of activities that affect the rights of the inhabitants of the Motagua River basin.Strengthen regulations related to wastewater disposal and solid waste management so that they are implemented in a timely manner through complete treatment systems in the municipalities of the basin.Initiate actions to enable the socio-environmental restoration of affected ecosystems throughout the basin, including political, legislative and administrative measures to strengthen the legal system and allocate sufficient financial resources to ensure the protection of waters and territories.
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The treaty protecting life on the high seas: Why should governments ratify it?
The ocean covers two-thirds of the planet. It is so immense and vast that 64% of its waters are outside any border, in a space known as the high seas.It is an area that lies outside national jurisdictions and represents 40% of the Earth's surface.Because of the wealth of marine life it harbors - including species new to science - the high seas are one of the world's greatest reserves of biodiversity. It is also a source of food and oxygen, regulates the climate, cushions the impacts of the climate crisis and sustains the livelihoods of fishing and tourism communities.Despite their importance, only 1.2% of the waters of the high seas have international protection.To fill this gap, in June 2023, UN member countries formally adopted an agreement to protect biodiversity in the high seas, which needs ratification by at least 60 countries to enter into force.Find out how many and which countries have ratified the treaty. As a reservoir of global common goods, the protection and sustainable use of the high seas is a right and an obligation of all governments. What does the High Seas Treaty state?The High Seas Treaty - short name for the Agreement on the Conservation and Sustainable Use of Marine Biological Diversity of Areas beyond National Jurisdiction (BBNJ Agreement) - is universal and can benefit all countries, even those that are not party to the United Nations Convention on the Law of the Sea (UNCLOS), such as Colombia, El Salvador, Peru and Venezuela.The treaty contains the following key elements:Area-based management tools. The treaty establishes a legal framework and a clear process for creating networks of marine protected areas, which can provide comprehensive protection for biodiversity in the high seas from multiple activities, maintaining the health and resilience of this part of the ocean.Environmental impact assessments. Under the treaty, any new activity on the high seas is subject to detailed, modern environmental impact assessments that include the cumulative impacts of multiple activities affecting the same ecosystem. Developing countries will be supported to take part in this task.Fair and equitable sharing of benefits from marine genetic resources. The agreement establishes obligations to share monetary and non-monetary benefits from the utilization of genetic resources found in the high seas (genetic material of any animal, plant or microbe) to develop new medicines, for example.Capacity building and technology transfer. The treaty provides for the provision of financing and technology transfer on fair terms for developing countries to increase their marine scientific and technological capacity, including data exchange, infrastructure development and improvement, and respect for traditional knowledge. Why should governments ratify the High Seas Treaty?Having a High Seas Treaty took more than two decades, including five years of negotiations at the UN. To secure this historic breakthrough, the agreement must enter into force - become law under international law - which will occur 120 days after 60 countries have ratified it. So far, 28 countries have ratified the treaty.Ratification means that countries, in addition to signing it, give their formal consent to the treaty, which often involves ensuring that their national laws are consistent with it.There are many reasons why ratification of the agreement will benefit developing countries, particularly those in Latin America and the Caribbean. Some of these are:The treaty brings us closer to environmental justice. It will benefit countries historically excluded from access to the resources of the high seas, providing them with new opportunities for technological, scientific and economic development. It will also allow all countries to be active players in a global platform for decision-making, coordination and cooperation for the protection and sustainable use of these resources.The treaty allows for the conservation of key ecosystems. Under the treaty, all countries will be able to propose marine protected areas on the high seas, including landlocked countries (such as Bolivia and Paraguay). This will allow the protection of areas rich in biodiversity and endemic species in Latin America, such as the Salas y Gómez & Nazca submarine mountain ranges (Chile-Peru) or the Thermal Dome in the Central American Pacific.The treaty benefits local livelihoods and economies. By promoting a healthy and resilient high seas, the treaty will have positive effects on coastal areas and economic activities that depend on migratory species, such as whale and turtle watching, diving, tourism, commercial and sport fishing. Highly migratory species such as squid are vital to Latin American economies.The treaty provides a voice in decision-making on the high seas. Countries that have signed the treaty will participate in the meetings of the Preparatory Commission and those that ratify it will be able to participate in the Conference of the Parties (COP) of the agreement, the first version of which will take place one year after its entry into force, where key aspects of its implementation and the realization of its benefits will be decided.The call is therefore for all countries to ratify the High Seas Treaty, thus protecting 64% of our ocean, which today lacks effective protection.It is time to act for marine life and for future generations.
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Families of La Oroya demand Peru comply with Inter-American Court ruling
One year after the decision, the state has still not implemented the ordered reparations. The population lacks comprehensive health care and is once again exposed to toxic contamination due to the reactivation of the La Oroya smelter complex, which is operating without adequate environmental management.One year after the Inter-American Court of Human Rights ordered the Peruvian state to provide comprehensive reparations to the residents of La Oroya, after finding it responsible for violating their rights, the victims are still waiting for the ruling to be implemented and for state to comply with its international obligations."It's already been a year since the ruling was announced, how much longer will we have to wait?" asked Yolanda Zurita, a resident of La Oroya and a petitioner in the case. "Enough is enough! We demand that the Peruvian state immediately comply with the ruling of the Inter-American Court, which will benefit not only the victims of the case, but also the population of La Oroya and the country exposed to toxic substances from the indiscriminate development of extractive and industrial activities in our territories."On March 22, 2024, in a landmark decision for the protection of a healthy environment in Latin America, the Court responded to the long and tireless search for justice by the families of La Oroya, who have been affected for decades by the extreme levels of contamination from the La Oroya Metallurgical Complex (CMLO) and the lack of adequate protective measures by the State, which today ignores the ruling and underestimates its importance.Although the Court ordered the State to ensure that CMLO's operations comply with international environmental standards and to prevent and mitigate damage to the environment and human health, the opposite is currently the case: the complex has reactivated its operations without having modernized its facilities to prevent and mitigate the environmental and health risks it generates for the population.It is urgent that the CMLO stops polluting and that the Peruvian State adopts the measures required by the Court to modernize it in accordance with international environmental standards of environmental protection, in compliance with the ruling."With the reactivation of the metallurgical complex, the people of La Oroya are once again being exposed to levels of pollution that endanger their lives; the Inter-American Court's ruling is clear and the State is obligated to comply," said Rosa Peña, senior attorney with the Inter-American Association for Environmental Defense (AIDA). "The delay in complying with the ruling is re-victimizing the families who have been demanding justice for more than 20 years."The court also ordered the state to provide free medical care to the victims and to guarantee specialized care to residents with symptoms and illnesses related to contamination from the mining and metallurgical activities. Today, however, comprehensive health care is not guaranteed in La Oroya. It is necessary that the State, through and in coordination with the Ministry of Health, the Regional Health Directorate of Junín, the General Directorate of Environmental Health, and health care providers, create and implement the protocol for comprehensive care for victims in La Oroya, as established by the Court.The ruling set a historic precedent for the control of industrial pollution by states. For the Peruvian State to make real progress in its implementation, it is imperative that the Attorney General's Office issue the Compliance Resolution."Despite the deadlines set by the Inter-American Court for the Peruvian State, there has been virtually no progress in the implementation of the ruling," said Christian Huaylinos, coordinator of the legal department of the Pro Human Rights Association (APRODEH). "Above all, the nature of the case must be taken into account, which implies that La Oroya has been classified as a sacrifice zone due to the high levels of contamination; therefore, the need to fully compensate the victims is urgent." Background of the caseLa Oroya is located in the central mountain range of Peru, in the department of Junin, 176 km from Lima. In 1992, the US company Cerro de Pasco Corporation installed the La Oroya Metallurgical Complex (CMLO) to process mineral concentrates. The complex was nationalized in 1974 and operated by the state under the name Centromin Peru until 1997, when it was taken over by Doe Run Peru, which operated it until 2009. In short, the CMLO is over 100 years old.In La Oroya, most of the people affected by the CMLO contamination, including children, have lead levels higher than those recommended by the World Health Organization. In some cases, they have registered higher levels of arsenic and cadmium, in addition to stress, anxiety, skin problems, stomach problems, chronic headaches, and respiratory or cardiac problems, among others.In the absence of effective responses at the national level and on behalf of the victims, an international coalition of organizations filed a complaint against the Peruvian State with the Inter-American Commission on Human Rights in 2006. In October 2021, the Commission found the Peruvian government responsible and referred the case to the Inter-American Court. In October 2022, more than 16 years after the international complaint was filed, the victims, represented by AIDA and APRODEH with the assistance of Earthjustice, brought the case before the Court. Press contactsVíctor Quintanilla (Mexico), AIDA, [email protected], +52 5570522107María Nieve Sullón (Peru), APRODEH, [email protected], +51 984926868
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