Mosca & Arestizábal Strategic Sanitation Advisors

Technical-Strategic Expertise for the Global Water Sector

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Who We Are

Mosca & Arestizábal is a Chilean consulting firm with over 40 years of experience in the transformation of the water and sanitation sector.

Chile’s Sanitation Reform: A Proven Model

Tracking Four Decades of Expansion, Regulation and Private Participation

Over the past four decades, Chile has implemented one of Latin America’s most successful water and sanitation reforms.. The chart below illustrates the evolution of service coverage alongside the growing participation of private operators.

This transformation was made possible through a clear regulatory framework, tariff policies, infrastructure investment, and targeted subsidies — a process in which Mosca & Arestizábal played a key technical role.

Key milestones:

Water supply and sewerage coverage increased from under 60% to near-universal access.
Wastewater treatment coverage rose from under 10% to over 95%.
By 2005, nearly 100% of service areas were operated by private companies under a regulated model.