Mosca & Arestizábal Strategic Sanitation Advisors
Technical-Strategic Expertise for the Global Water Sector
Technical-Strategic Expertise for the Global Water Sector
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.
Deep understanding of regulatory frameworks.
Proven modeling tools.
Experience with public and private stakeholders.
Adapted methodologies for global contexts.
Tariff and subsidy model design
Regulatory efficiency analysis
Infrastructure cadaster
Reform strategy support
Cost modeling and investment advice
Over 25 years advising the regulator.
Led tariff processes for 20+ utilities.
Designed and applied regulatory tools.
Legal, financial and ops reform support.
Created models used nationwide.
Experience in planning and rural expansion.
Marco Antonio Mosca Arestizábal
Ingeniero Civil Industrial / Pontificia Universidad Católica de Chile
Master of Business Administration / Pontificia Universidad Católica de Chile
Contacto: marco@mosca.cl
Raquel Inés Arestizabal Arestizábal
Ingeniero Civil Sanitario / Universidad de Chile
Contacto: raquel@mosca.cl