Yucatán DJ Parties in Secret Cenotes Trigger Environmental Scrutiny

Mérida, Yucatán — Amplified music, artificial lighting and crowds of partygoers inside cenotes have set off environmental alarms in Yucatán after images circulated of electronic dance parties held in these fragile underground ecosystems.

The case has moved beyond a social media controversy because the organization at the center of it, Mérida Worldwide, openly promoted what it called “Cenote Sessions” on its website — monthly outings headlined by DJ sets in “secret cenotes off the tourist map.” The same platform lists the gatherings among its activities for socializing and exploring Yucatán.

The dispute now leaves environmental authorities facing several questions: which cenotes hosted the events, who authorized their use, how many people entered, and what environmental permits and carrying-capacity studies backed the activities?

So far no public ruling has established that the parties caused specific environmental damage, and no firm sanction has been issued against those responsible. But Yucatán’s current rules make one point clear: a cenote cannot legally be treated as a private party hall.

What state cenote regulations require

Yucatán has a regulation accompanying its Environmental Protection Law on Cenotes, Caves and Grottoes, which sets obligations for both landowners and anyone who enters, uses or profits from these cavities.

Article 5 states that compliance falls not only on property owners or holders, but on anyone who enters, uses the facilities or obtains benefits from them. Environmental responsibility, in other words, does not necessarily stop with the landowner.

Article 7 requires interested parties to obtain the applicable federal, state or municipal authorizations and to file an Environmental Impact Statement with the environmental authority under state law, accompanied by a tourist carrying-capacity study when applicable — a provision that becomes relevant for events that concentrate crowds, sound equipment and lighting inside or around a natural cavity.

Visitor limits are not left to chance

The rules require owners or managers of cenotes used for tourism to carry out a tourist carrying-capacity study establishing how many people a site can receive without exceeding the conditions needed for its conservation. They must also verify water quality annually and keep the results to hand over to environmental authorities.

For the electronic parties, one question is whether the sites had such a study and whether attendance stayed within the limits set for each cavity.

Even drinking inside a cenote is restricted

Article 6 requires visitors to refrain from drinking alcohol or taking drugs inside cenotes, caves and grottoes, and from entering under the influence. It also bans smoking, eating or drinking, leaving trash and damaging flora, fauna or natural installations.

Visitors must avoid applying sunscreen, soap and other products capable of upsetting the ecological balance at least three hours before entering the water, except in certain cases involving biodegradable products. Official guidance for tourist cenotes across Yucatán repeats that swimmers should not enter the water wearing sunscreen or insect repellent — a sign of how sensitive authorities consider these bodies of water.

Artificial lighting is not a minor issue

Article 38 aside, the rules treat artificial illumination as a violation in its own right: keeping light sources running inside a cenote, cave or grotto for more than five hours a day is an infraction, and lighting cavities with torches or bonfires is expressly prohibited.

The concern has a scientific basis. Cave ecosystems host organisms adapted to very low light or complete darkness, including blind fish endemic to the Yucatán Peninsula, along with crustaceans, invertebrates and bats that have developed specific adaptations to these environments.

Scientific documentation from Yucatán identifies cave fish such as Ogilbia pearsei and Ophisternon infernale, and warns that aquatic fauna in cenotes is especially sensitive to deteriorating environmental conditions. Recent studies of cave fauna have shown that artificial lighting can alter the behavior of bats using caves as refuges, with certain wavelengths and intensities delaying or preventing them from emerging.

Bringing floodlights, decorative lights or party lighting into a cavity naturally adapted to darkness, researchers suggest, cannot be considered environmentally neutral.

Formations that took millennia can break in seconds

Caves and cenotes hold stalactites, stalagmites, columns and other mineral structures built up through extremely slow processes. Article 26 states that infrastructure may never damage or alter natural formations and orders that any work be limited to what is strictly necessary to preserve the site’s natural appearance. It also prohibits placing ropes, cords or other materials capable of damaging columns, stalactites or stalagmites.

Crowding people into small areas, moving around these structures and installing temporary equipment raises the physical risk. That does not mean the reported parties broke a mineral formation — only a technical inspection could establish that — but the fragility of the structures makes it essential to know whether the cavities were examined after the events.

Damaging natural structures is a serious violation

Yucatán classifies damage to or alteration of the natural structures of cenotes, caves and grottoes as a serious infraction. Under Article 38, such violations carry fines of between 1,000 and 50,000 days of minimum wage, along with the possibility of temporary or permanent partial or total closure while repairs or restoration are carried out. Repeat offenses and environmental harm can bring higher penalties and the suspension or cancellation of permits, concessions, licenses or authorizations.

That turns the dispute into a potential administrative and environmental matter, not merely a question of public disapproval.

A connected and vulnerable aquifer

Cenotes form part of a hydrogeological system connected to the Yucatán Peninsula aquifer. Because of the limestone rock, its high permeability and the presence of fractures and underground channels, contaminants can seep in and travel more easily than in other types of soil.

Technical documents from the National Water Commission (CONAGUA) describe the peninsular aquifer as highly vulnerable because of the karst nature of the subsoil. A regional hydrological assessment identifies large stretches of Yucatán with high, very high and extreme vulnerability, particularly around the Ring of Cenotes and the karst of the state’s east.

Residues from drinks, chemicals, trash, cosmetics and other pollutants that reach a cavity therefore are not necessarily confined there — they join a much larger underground system.

Contaminants already detected in peninsula cenotes

Pressure on these ecosystems is not hypothetical. Researchers at the Yucatán Scientific Research Center (CICY) have documented pollutants in regional water bodies, with preliminary studies finding between one and 250 microplastic particles per liter of water in wells and cenotes of the peninsula. Scientists warn these materials can enter food chains and carry other contaminants, including heavy metals.

CICY’s 2026-2030 institutional program also reports fecal coliforms, norovirus, heavy metals and pesticides detected in wells and cenotes, against a backdrop of mounting pressure on the peninsular aquifer.

“Secret cenotes” raise registry questions

Mérida Worldwide says on its website that it was founded in March 2024 and promotes a community bringing together foreigners, residents and visitors for experiences across Yucatán. Its monthly lineup includes the “Cenote Sessions,” described as DJ sets in “secret” cenotes far from the tourist map.

That description opens another front: identifying exactly which cavities were used. Not every cenote has tourism infrastructure, environmental monitoring, sanitary testing or an established capacity to receive large groups. State law requires owners to notify authorities when a cenote, cave or grotto lies on their land so it can be added to the Yucatán State Census of Cenotes, Caves and Grottoes.

Locating the so-called secret cenotes is therefore essential to establishing their legal status, ownership, registration, environmental condition and authorizations.

Organizers back down after backlash

After the images drew criticism, Mérida Worldwide issued a public apology. The organization acknowledged that activities of this kind should have been assessed with greater environmental responsibility and said it will not again hold events with amplified music in cenotes or other natural spaces. It also said it will consult specialists and local organizations and evaluate the potential impacts of its activities more rigorously.

The apology, however, does not replace a possible administrative review. The central question remains open: if the events required certain permits, studies or environmental conditions, it falls to authorities to verify whether they were met.

Questions still unanswered

The controversy leaves at least six points that require official clarification: how many parties took place, in which cenotes, who owns those sites, how many people attended, what permits were processed, and whether tourist carrying-capacity studies existed.

Authorities would also need to determine whether structures, electrical equipment, speakers or lighting were installed inside the cavities and for how long, whether drinks were consumed inside, and whether water quality, wildlife and mineral formations were inspected afterward.

Until a technical ruling exists, no one can say that a particular stalactite was destroyed, that the water was contaminated by a specific party or that species were directly harmed. But the absence of publicly proven damage does not mean the events should go unexamined. Yucatán’s legislation has recognized cenotes as vulnerable ecosystems for more than a decade, regulating their tourist use, limiting activities capable of altering their natural conditions and setting penalties for those who damage their structures.