In 1994, Arc Ecology was part of a delegation to the Philippines whose objective was to develop strategies on the technical aspects of both environmental assessment and base clean-up and the health impacts of these base contaminants

The strategy was to build networks within and between both the U.S. and the Philippines, and assist in improving bilateral dialogue and cooperation between the two governments. This delegation wrote an environmental report based on U.S. Department of Defense (DoD) documentation and the team's visits to the former U.S. base sites at Clark and Subic. This report that came from this delegation addresses the problem of off-base migration and potential health impacts of base contaminants, with a concentration on demonstrating that the Subic and Clark do contain sites known to be contaminated by toxic wastes that pose a human health risk. The report also presented recommendations for actions to be taken to initiate a complete assessment of the toxic contamination and the clean-up process.

During the October 1999 International Summit on Military Base Cleanup, Arc Ecology's partner organization in the Philippines, the People's Task Force for Bases Cleanup (PTFBC), asked that we re-evaluate the resources available to promote a grassroots legal response to the issue of military base contamination at the Clark and Subic sites.

In 2000, the United States Working Group on Philippine Bases Cleanup became the Filipino American Coalition for Environmental Safeguards (FACES), chaired by Arc Ecology Board of Director's member Jorge Emmanuel. The objective of FACES is to unite the US-based Filipino American community in a campaign to obtain justice for the base pollution problem. Arc Ecology provides the US legislative/grassroots campaign strategy and environmental technical support services to FACES.

On December 2, 2002, Arc Ecology, with FACES and a group of Philippine people, sued the United States Navy and Air Force for failing to characterize environmental contamination and unexploded ordnance pollution leading to the deaths of more than 170 people over the last decade.

In 2001, Arc Ecology's International Program Coordinator and Civil Engineer, Nerminda Sagum, traveled back to her native Philippines to assess the potential for developing an alternative source of clean water for the poor communities surrounding Clark Air Base. Most recently in April 2002, negotiations between Arc Ecology's Executive Director, International Campaign Coordinator, the Program Coordinator of the Philippine-based People's Task Force For Base Cleanup, and Philippine Senator Serge Osmeña led to a commitment of $1.5 million Philippine pesos to tap a new water supply with an engineering design to be created by Arc Ecology's staff (pro-bono) for the community of Sapang Bato.