Marilao is a first class urban municipality in the province of Bulacan, Philippines. According to the latest census, it has a population of 160,452 inhabitants in 22,363 households. In 2007, The City of Meycauayan and the town of Marilao in Bulacan province share a slot in the list of the world’s 30 most polluted places in the developing world drawn up by a private New York-based institute. In its report, “The World’s Worst Polluted Places” for 2007, the Blacksmith Institute said: “Industrial waste is haphazardly dumped into the Meycauayan, Marilao and Obando River system, a source of drinking and agricultural water supplies for the 250,000 people living in and around” the Meycauayan-Marilao area. Marilao is also border with Caloocan City.“The river system is extremely polluted due to wastes received from tanneries, gold and precious metals refineries, the largest lead smelter in the Philippines, which is the City of Meycauayan, Bulacan and numerous municipal dumpsites,” it said.

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