Baguio’s Environmental Concerns: A Case Study

Baguio City was designed for 25,000 people. Today, nearly 400,000 residents call it home, and over a million tourists visit each year. That gap between the original plan and the current reality is at the heart of Baguio’s environmental problems. The city’s infrastructure — its sewage system, roads, and even its air — was built for a much smaller, quieter place. Now, everything is strained.

This isn’t just a numbers problem. It affects the water you drink, the air you breathe, and the future of the city itself. The four major rivers running through Baguio — Balili, Ambalanga, Asin-Galiano, and Bued — all tested positive for fecal coliform in 2023. The air at Burnham Park, one of the city’s most popular spots, breaches WHO safety guidelines for fine particle pollution two out of every five days. These are not abstract issues. They change what it means to visit or live in Baguio right now.

What’s Happening to Baguio’s Water

Here’s the key term you need to know: fecal coliform. It’s a bacteria from the feces of humans or animals. When it shows up in rivers, it means untreated sewage is getting into the water. The DENR-EMB Cordillera Region found it in all four of Baguio’s major river systems during quarterly tests in 2023. The city’s only sewage treatment plant, the BSTP in North Sanitary Camp Barangay, was built by the Japanese government in 1986. It simply cannot keep up.

The city government has been trying to catch up. As of August 2024, the City Environment and Parks Management Office (Cepmo) had issued 224 notices of violations and collected PHP 115,000 in fines. The violations include illegal wastewater disposal, piggeries discharging into canals, and leaking or overflowing septic tanks. Hog raising is common among the Ibaloy and Kankanaey residents for ritual sacrifices, and it’s a frequent violation found during inspections.

The consequences are serious. Contaminated groundwater from unregulated deep wells has caused gastroenteritis outbreaks. One outbreak in December led to hotel reservation cancellations and slow business at restaurants. The city now tests water trucks and source samples regularly to meet national sanitation standards. Drinking water stations have tested negative for contamination, so the tap water is safe, but the river pollution is a clear sign of a system under stress.

What’s Happening to Baguio’s Air

Baguio’s air isn’t as clean as it looks. The city’s annual PM2.5 concentrations have not fallen below the WHO annual safety standard since 1998. Between 1998 and 2023, Baguio averaged 25.15 μg/m³ — five times the WHO threshold of 5 μg/m³. At its worst in 2010, Baguio was the most polluted city in the Philippines.

Road emissions are the main culprit. The transport sector accounts for 94% of criteria air pollutants and 24% of climate pollutants in Baguio. Jeepneys are the leading source of carbon dioxide emissions. UV Express units contribute the most particulate matter and black carbon. Motorcycles emit large amounts of non-methane volatile organic compounds and carbon monoxide. Buses are the main source of sulfur dioxide.

The city’s streets were designed for 20,000 vehicles. That threshold was breached as early as 1988. Today, Baguio has 59,000 registered vehicles, with an additional 28,000 vehicles passing through daily. The resident population of 360,000 nearly doubles during the day as people commute in for work and school.

During the pandemic lockdowns in 2020, Baguio’s air pollution fell to a record low of 15.51 μg/m³ — still three times the global threshold. That shows how much of the problem comes from normal daily activity, not just special events. The worst single day at the Burnham Park monitoring station was New Year’s Day, with concentrations spiking at 73.23 μg/m³ due to firecracker use. Outside of that, PM2.5 concentrations begin bordering unhealthy territory during the days leading to Holy Week and the December holidays, linked directly to tourist surges.

In 2023, air pollution was the second leading risk factor for deaths in the Philippines. Baguio’s air quality, while better than most Metro Manila cities due to stricter zoning enforcement and roadside emissions testing, still poses a real health risk, especially for people with respiratory conditions.

What’s Being Done About It

The city isn’t ignoring the problem. In 2019, Mayor Benjamin Magalong formed the ADB-aided Baguio Resilient City Tourism Project (BRCTP). This is a five-year plan that includes rehabilitating, upgrading, and expanding the BSTP, as well as improving septage management. The Asian Development Bank’s Cities Development Initiative for Asia (CDIA) provided technical assistance in 2014 with a $231,536 grant to analyze Baguio’s sanitation and develop strategies for flooding, drainage, and wastewater management for 2016–2035.

A pre-feasibility study was completed by 2016 to improve the water quality of Balili and Bued rivers. However, a 2023 ADB-CDIA progress report noted that no infrastructure improvements had been made yet. The report did mention that the city was leveraging tourism department funding and using city resources to acquire sludge dewatering equipment and rehabilitate sewer lines in the central business district.

In June 2024, a public consultation for the BRCTP was held. City Budget Officer Leticia Clemente stated that after 35 years, the BSTP’s performance had not remained the same and that new technologies had evolved. A major upgrade of the existing BSTP is necessary to complete the job.

The stakes are high. The DENR can impose penalties of up to PHP 6 million per month per river for polluted rivers or non-compliance with water quality standards. That’s PHP 72 million per year per river. For the four polluted rivers, Baguio would owe PHP 288 million in fines. The polluted rivers also affect La Trinidad Valley, a major highland crop producer known as the Salad Bowl of the country. Contaminated water could damage the vegetable industry and make people sick.

What This Means for Your Trip

If you’re planning a trip to Baguio, here’s what you need to know. The city’s environmental problems don’t mean you shouldn’t go. They mean you should plan smarter. The air quality is worst during Holy Week and the December holidays, when tourist numbers peak. If you have asthma or other respiratory issues, consider visiting during the off-season, like the rainy months of July to September, when rain helps clear the air.

The water is safe to drink from regulated sources. The city tests water stations regularly, and they’ve tested negative for contamination. But stick to bottled or filtered water, especially if you’re not used to the local water. The rivers are polluted, so avoid swimming or wading in them. Stick to designated swimming areas in resorts or pools.

The city’s roads are congested, especially during peak tourist seasons. If you can, use public transport or walk. The city is walkable in many areas, and you’ll avoid contributing to the traffic and air pollution. The city’s roadside emissions testing program fines drivers and can take vehicles off the road if their exhaust appears black. That’s a good sign, but it doesn’t solve the underlying problem of too many vehicles on roads designed for far fewer.

Frequently Asked Questions

Looking Ahead

Baguio’s environmental problems are serious, but they’re not unsolvable. The city has a plan, and there’s growing awareness among residents and officials. The question is whether action will come fast enough. The National Economic and Development Authority (NEDA) projects that a “business as usual” approach will lead to urban decay by 2043. That’s not a distant future. It’s less than two decades away.

For now, the best thing you can do as a visitor is to be mindful. Use public transport. Don’t litter. Support businesses that follow environmental regulations. And if you see something wrong — like a pipe discharging waste into a river — report it. The city’s future depends on the choices made today.

If this was useful, you might also want to read our guide on how to preserve Baguio’s charm for future generations.

Sources

Visiting Baguio: Climbing the Ancient Pine Trees — A look at Baguio’s natural attractions and how they’re affected by environmental changes.

Baguio’s Cultural Renaissance: How the City is Reclaiming Its Heritage — Explores the city’s efforts to balance development with cultural and environmental preservation.

A stinking problem: Population, tourist growth overwhelm Baguio’s sewage system. BusinessMirror, 2024.

In Baguio, the air that draws crowds isn’t as clean as it seems. Philippine Center for Investigative Journalism, 2026.

Baguio Chronicle: TAN-AW — Our Vision for Baguio. Rappler, 2024.