Scientists Detect Early Signs of Groundwater Contamination in Quintana Roo

Cancún, Quintana Roo — Scientists at the Yucatan Center for Scientific Research (CICY) are using aquatic organisms as biological indicators to detect groundwater contamination in Quintana Roo, hoping to identify warning signs before pollution becomes visible.

The research relies on bioindicators — organisms and microbial communities living underground — to flag changes in water quality. Investigators say the approach can reveal stress in the aquifer long before chemical tests or visible symptoms confirm a problem.

A Karst Landscape Vulnerable to Pollution

The work is particularly relevant given the geology of the Yucatan Peninsula, where limestone rock dominates and surface rivers are scarce. That structure allows contaminants to filter down into the water table and reach the aquifer with little natural filtration.

The Water Sciences Unit of the Centro de Investigación Científica de Yucatán, based in Cancún, is developing biological monitoring methods to complement conventional chemical analysis. The goal is to gather information on the condition of the underground system and detect possible alterations linked to human activity.

Traces of Medicine, Caffeine and Detergents

Among the pollutants identified during the studies are traces of medications, personal care products, caffeine and compounds derived from detergents. These so-called emerging microcontaminants can reach the subsoil through irregular discharges and poorly functioning septic systems.

Even at low concentrations, their constant presence can trigger responses in the organisms that live in groundwater. Tests using bioindicators have shown cellular changes and patterns of biological stress in microinvertebrates and local microbial communities.

Bacteria as an Early Warning System

Researchers are also analyzing the makeup of bacteria that occur naturally in groundwater. They believe shifts in these communities can serve as an early signal of changes in water quality, even before deterioration becomes visible.

To track those variations, specialists conduct studies in urban cenotes and monitoring wells in northern Quintana Roo. The results are intended to establish how much pressure human activity places on different parts of the water system and to identify areas that require closer attention.

Risks to Mangroves and the Mesoamerican Reef

Protecting the Quintana Roo aquifer is critical because groundwater is connected to coastal ecosystems. Experts warn that untreated contamination can damage mangroves and the Mesoamerican Reef System.

The data produced by the research could help strengthen environmental regulation, improve wastewater treatment and safeguard the state’s water sources.