The water supply to much of the Central Valley will be cut to a third over the weekend because the Instituto Costarricense de Electricidad is doing work on a hydroelectric plant in Cartago.
The water company, the Instituto Nacional de Acueductos y Alcantarillados also is involved.
The power company said that the job involves building a base for future construction at the Río Macho plant. A similar reduction in the flow of domestic water is expected Sept.1 and 2.
The power company said that the reduction would begin at 8 a.m. Saturday and continue until 8 p.m. Sunday. Affected are water customers in San José, Desamparados, Curridabat, Montes de Oca, Coronado, Goicoechea, Moravia, Tres Ríos and Cartago.
The water company said about 550,000 customers will be affected. The 59-year-old hydro plant provides about 4.52 percent of the electricity generated by the Instituto Costarricense de Electricidad, it said.
Both agencies urged responsible use of water. The construction work involved the point where water is taken into the plant from the river.