Monitoring conducted across 37 cenotes, caves, and bodies of water within the urban footprint and metropolitan area of Playa del Carmen revealed high levels of fecal coliform and nutrient contamination—a situation highlighting the deteriorating quality of the water flowing beneath the city, warned Guillermo de Cristi, a member of the “Cenotes Urbanos” (Urban Cenotes) citizen science group.
During a presentation on the environmental state of the region’s aquifer, the specialist noted that the results show a consistent pattern of contamination at all monitored sites within urbanized areas, whereas cenotes located in the jungle—far from human influence—exhibit significantly better conditions.
According to De Cristi, the studies provide a representative sample of the groundwater quality beneath Playa del Carmen and clearly identify the link between urban growth and the environmental degradation of the aquifer system.
He explained that the contamination stems from multiple sources. Key factors include informal settlements lacking sanitary drainage infrastructure, the use of cenotes and caves as illegal dumping grounds, and haphazard urban expansion that has left vast areas without access to adequate wastewater treatment systems.
He noted that many households still discharge sewage into septic tanks—or, in some cases, directly into excavations connecting to the subsoil—allowing untreated waste to reach the aquifer. Compounding this are failures in existing infrastructure, such as broken drainage pipes and damaged manholes, which cause direct seepage into the groundwater.
“We need to start pinpointing these contamination hotspots so we can address them,” said the Cenotes Urbanos member, emphasizing the need for specific measures to halt environmental degradation.
Specialists warn that unplanned urban growth is increasing pressure on the region’s aquifer.
The specialist noted that the Yucatán Peninsula is characterized by its karst geology, composed primarily of highly permeable limestone. This condition allows any substance deposited on the surface—ranging from fats, oils, and chemicals to trash or wastewater—to rapidly infiltrate the subsoil and compromise water quality.
Furthermore, he explained that a complex hydrological system lies beneath the city, where freshwater streams from the jungle converge with inland-moving seawater flows; this makes the ecosystem particularly vulnerable to any source of contamination.
Regarding the proposal to establish a new protected natural area encompassing key cenote zones and underground systems in Quintana Roo, De Cristi noted that while the measure alone would not solve current pollution problems, it would serve as a vital legal tool for preventing further impacts and addressing existing ones.
He detailed that the project is currently in the stage of drafting the preliminary justification study—a complex undertaking given the vast territorial and environmental scope of the area slated for protection. Once this phase concludes, the process will move to a public consultation covering the entire area of influence of the future protected natural area in Quintana Roo.
A member of the Ciencias Ciudadanas Cenotes Urbanos (Urban Cenotes Citizen Science) group emphasized that citizen participation would be crucial during this stage, as it would facilitate the dissemination of information regarding the aquifer’s condition and strengthen conservation efforts for one of the region’s most important natural resources.
Monitoring results reinforce warnings issued by specialists and environmental organizations regarding the mounting pressure on the groundwater system in Playa del Carmen—a network that supplies the local population and sustains the ecosystems defining the Mexican Caribbean.
Source: quintanaroo.heraldodemexico
