2013年-世界发展银行全球_Water_Nationalization_and_Service_Quality_24页_178kb

Summary of "Water Nationalization and Service Quality"

Core Content

This paper investigates the impact of Uruguay's privatization and subsequent nationalization of water services on network access and water quality. The study focuses on the Department of Maldonado, where the first privatization of water services occurred in 1993 and was later reversed in 2004 through constitutional amendment. The analysis compares changes in service quality and access between cities that were privatized and then nationalized and those that remained publicly owned.

Main Findings

• Privatization had little impact on network access and water quality.
• Nationalization led to significant improvements in both network access and water quality.
• The bottom 25% of income households saw the most notable gains in access to sanitation networks.
• Water quality improved, as evidenced by a reduction in abnormal test results for microbiological and inorganic indicators.
• The control group consists of cities that remained publicly owned, allowing for a direct comparison with the nationalized cities.

Key Points

Background on Water Privatization and Nationalization

• In the 1970s, the public sector was seen as the only viable provider of water services due to concerns about private monopolies favoring wealthier consumers.
• By the 1990s, privatization was promoted as a solution to inefficiencies in public water services, especially in developing countries.
• However, public dissatisfaction with private companies led to nationalization in many Latin American countries, including Uruguay.

Uruguay's Water System

• OSE (Obras Sanitarias del Estado) was the main public water provider in Uruguay until the early 1990s.
• In 1993, Aguas de la Costa was introduced in Maldonado, serving wealthier areas.
• In 2000, Uragua took over the western part of Maldonado, including the capital.
• In 2004, the Uruguayan constitution was amended to declare water as a public good, leading to the nationalization of both Uragua and Aguas de la Costa.
• By 2006, OSE was the sole provider of water services in Maldonado.

Empirical Methodology

• The paper uses a difference-in-difference approach to compare changes in sanitation access and water quality before and after privatization and nationalization.
• The treated group includes three cities: Maldonado, Pan de Azúcar, and San Carlos.
• The control group consists of 32 cities, including departmental capitals and other large cities.
• Panel data from 1986 to 2009 is used, with the ECH (Encuesta Continua de Hogares) as the primary source for sanitation access data.

Data and Observations

• The ECH survey is representative only at the department or city level for large cities.
• The sample is unbalanced, with some cities not surveyed in all years.
• The paper also checks robustness by analyzing a subsample from 1993 to 2009.
• The number of control cities is larger than the number of treated cities, so the model is also estimated with only capital cities as controls.

Results

• Nationalization resulted in significant improvements in both sanitation access and water quality.
• Privatization had little to no impact on these outcomes.
• Water quality improvements were measured through microbiological and inorganic tests, with a negative coefficient indicating a decrease in abnormal levels.
• Sanitation access increased, especially among low-income households.
• The results suggest that nationalization led to better service delivery than privatization, but the paper cautions against overinterpreting these findings, as the control group is not a direct comparison of public vs. private performance.

Conclusion

The study concludes that nationalization of water services in Uruguay improved access and quality, particularly for lower-income households. It highlights that privatization did not deliver the expected benefits in terms of service quality and network coverage. However, the authors emphasize that their results do not conclusively prove that the public sector is superior to the private sector, as the control group consists of consistently public-owned cities, and health outcomes are influenced by many other factors.

References to Supporting Literature

• Barrera-Osorio, Olivera, and Ospino (2009): Found that privatization in Colombia increased water access and quality in urban areas but had negative effects in rural areas.
• Galiani, Gertler, and Schargrodsky (2005): Showed that privatization in Argentina led to a decline in child mortality from water-related diseases, suggesting improved water quality.
• Wallsten and Kosec (2005): Analyzed water quality in the U.S. and found no significant difference in compliance with water safety regulations between public and private providers.

Limitations and Considerations

• Child mortality is not used as a dependent variable due to limited data on water quality before privatization.
• Cherry-picking by governments during privatization may have influenced the results.
• Robustness checks were conducted to ensure the validity of findings.
• Standard errors were clustered at the city level to account for serial correlation in panel data.