Today, one of the most serious problems in the world is water shortage (Brichieri-Colombi, 2008). The number of people suffering from lack of water is alarming: around a third of humanity does not have access to a water supply (Molden, 2010). It is therefore crucial to solve the problem of water scarcity. This essay will discuss and analyze solutions that could help avoid a future water crisis and to do so, the essay will make reference to Mexico where water scarcity is the national problem (Castro and Heller, 2009). The first solution that will be discussed is to reuse wastewater as fertilizer in agriculture; the second is to increase the prices of water supplies. But before discussing the solutions, the essay will describe the main problems related to water scarcity. Mexico is the country with the most serious water problem and it continues to deteriorate (UNESCO, 2006). Over the past two decades, as the country's population has experienced intensive growth, the demand for water has also increased significantly. The number of people suffering from water scarcity is around 11 million; almost 11% of the total population of Mexico (Castro and Heller, 2009). There are many problems related to lack of water. One of the main problems is that, faced with water scarcity, the government has decided to pump water from aquifers. For example, Mexico City is supplied with water by six aquifers (UNESCO, 2006). The consequences of pumping groundwater resources are quite negative: aquifers are overexploited and drying up, and the ground sinks by 40 cm each year (UNESCO, 2006). It is evident that water shortage is a serious problem and effective measures must be taken to prevent a water crisis. One of the most effective solutions to water scarcity is wastewater treatment. In Mexico, where wastewater pollution of watersheds is one of the causes of water scarcity, this type of treatment is very useful (Helmer and Spanish, 1997). This solution can be explained by the example of Mexico, where the government began to pay great attention to the regulation of sewer networks (Holiday and Marin, 2007). In this country, wastewater is used as fertilizer for crops (Helmer and Spanish, 1997). The process to obtain this type of fertilizer is very simple; wastewater is distributed to rural areas through different pipe systems and there it is treated by farmers.