Spanish Abstract: En Mexico se han aplicado ciertos procedimientos para valorar la cantidad de agua que se pierde por fugas en la red de abastecimiento dentro de un sector hidrometrico, como la aplicacion de la auditoria de fugas de corta duracion, el indice de caudal minimo nocturno y la prueba del caudal minimo sin consumo. Sin embargo, como la auditoria de fugas de corta duracion exige la detencion del servicio de agua a los usuarios, el indice de caudal minimo nocturno resulta muy aproximado al no considerar las variaciones de presion en la red, y en el proceso de caudal minimo sin consumo se necesita que todas las acometidas domiciliarias tengan instalada una llave de paso hacia el predio, se ha decidido evaluar los niveles de fugas en los sectores hidrometricos, empleando el metodo establecido por la International Water Association, IWA, para cuantificar el nivel de fugas en un sector hidrometrico, que se basa en los registros de la medicion continua y simultanea de la presion hidraulica y del caudal suministrado a su red durante un dia. Este metodo ha sido aplicado a varios sectores hidrometricos de la red de la ciudad de Mexico que se han construido y puesto en operacion recientemente. En este articulo se incluyen los resultados del proceso de evaluacion de los niveles de fugas de varios sectores hidrometricos piloto, que se implementaron recientemente en la red de agua potable de la ciudad de Mexico. El procedimiento consistio en identificar el caudal minimo nocturno de cada uno de ellos y obtener una curva de variacion de este caudal a lo largo del dia, en funcion del efecto de la variacion de la presion en la red. El volumen de fugas se calculo integrando esta curva en el tiempo. Como complemento al resultado del volumen de fugas, se calcularon varios indicadores de gestion de fugas, para ser comparados con valores estandar y definir asi el estado fisico probable de la red. English Abstract: In Mexico, certain procedures have been applied to assess the amount of water lost through leaks in the supply network within a hydrometric sector, such as the application of the short-term leakage audit, the minimum overnight flow rate and the test of the minimum flow without consumption. However, since the audit of short-term leaks requires the detention of the water service to the users, the minimum night flow rate is very approximate when not considering the variations of pressure in the network, and in the process of minimum flow without consumption it is necessary that all household connections have installed a stopcock to the property, it has been decided to assess the leakage levels in the hydrometric sectors, using the method established by the International Water Association, IWA, to quantify the level of leakage in a hydrometric sector, which is based on records of continuous and simultaneous measurement of the hydraulic pressure and the flow rate supplied to its network for one day. This method has been applied to several hydrometric sectors of the network of the city of Mexico that have been constructed and put into operation recently. This paper includes the results of the process of evaluation of leakage levels of several pilot hydrometric sectors, which were recently implemented in the drinking water network of Mexico City. The procedure consisted in identifying the minimum night flow of each of them and obtaining a curve of variation of this flow throughout the day, depending on the effect of the variation of the pressure in the network. The leak volume was calculated by integrating this curve over time. As a complement to the result of the leak volume, several leakage management indicators were calculated to be compared with standard values and thus to define the probable physical state of the network.