More alarming hidden groundwater crisis

“Grabe. Maski hinay lang uwan, nerbyoson na man ta.”

Dark clouds alone already raise everyone’s anxiety. Will the floods cover the streets and enter homes and communities again?

Floods, however, are not the only challenge everyone has to watch out and prepare for.

More alarming is a recent reminder about the “???????????????????????? ???????????????????????????????????????????? ???????????????????????? ???????????????????????????????????? ???????? ???????????????? ???????????????????????????????????????? ????????????????????????????????????.”

A Department of Science and Technology-funded study has reported declining groundwater quality in Cebu, Ilocos Sur, Benguet, Nueva Ecija, and Davao del Norte.

This means the water that all of us rely on for drinking, for farming, and for daily use may no longer be qualitatively safe.

This urgent research finding was published June 11, 2025, in a report of John Kenneth R. Fraga published by the UP Diliman College of Science entitled “The Hidden Crisis: Groundwater Quality in the Philippines and Why It Matters.”

That June 2025 report shared the research results of the DOST-funded Philippine Groundwater Health Index Project published in this reference: Velasco, A. B., Magbanua, F. S., del Rosario, J. S., Estrada, J. L., Fraga, J. K. R., Mondejar, J. P., Sapitan, J. F. J. F., Geroza, I. P., Tenoc. G. L., & Husana, D. E. M. 2024. Groundwater Quality Variations during Wet and Dry Seasons in Agricultural and Forested Areas in the Philippines. Water Resources, 51(2), 293–305. DOI: 10.1134/S0097807824604849.groundwater threat that needs urgent attention and priority! trapped beneath the Earth’s surface—is a resource that may be out of sight, but it is certainly not out of mind for many Filipinos. This invisible resource is vital for everyday life, especially in agriculture, where it provides the lifeblood for irrigation.

“However, as our demand for food grows and technology allows us to tap deeper into the Earth, groundwater faces an urgent crisis of over-extraction and contamination that demands immediate attention.

“In the Philippines, these problems are further complicated by the unique challenges posed by the country’s wet and dry seasons.

“During extreme weather events, runoff from farmlands can carry harmful chemicals into the groundwater, threatening the ecological services it provides, its biodiversity, and the general public’s health.

“Unfortunately, despite efforts to monitor water quality, the full extent of these problems remains poorly understood. Consequently, this produces patchy data and inconsistent assessments nationwide.

“The research showed that land use (agricultural or forested) and the season (wet or dry) significantly impact groundwater quality, but in different ways.

“Agricultural land use generally leads to warmer, more chemically rich but poorer groundwater quality. It also increases the risk of groundwater contamination due to farming activities.

“Forested areas, on the other hand, help maintain cooler, cleaner, and more oxygen-rich groundwater. However, their terrain—such as steep slopes—can influence the amount of organic matter present in the groundwater.

“During the wet season, increased rainfall helps cool groundwater and improves its oxygen levels. It also raises pH as rainwater carries minerals and organic material into the groundwater.

“Quite the opposite, the dry season brings warmer groundwater temperatures. Although oxygen levels may sometimes rise due to reduced water movement, overall groundwater quality tends to decline.

“Lower groundwater levels can lead to more concentrated dissolved ions and potential water quality concerns.

“The message is clear: both land use and seasonal changes are crucial to understanding the state of groundwater resources.

“The study emphasizes that the risks to public health and biodiversity will continue to grow without a comprehensive, nationwide approach to managing and monitoring groundwater quality.”

The researchers warn: “Groundwater is a limited resource, and its quality is steadily declining. Human population growth, economic development, and environmental changes all contribute to the pressure on this vital resource.”