At that time, the leaks in Wawarsing would be repaired and the bypass tunnel would be connected to the existing tunnel. The shut down work would begin in 2022 and take between five to eight months. According to the results of the OECD Survey on Water Governance for Future Cities, several Mexican cities (e.g. Hermosillo, Veracruz, Toluca and Chihuahua) show lower shares of wastewater treated (Figure 2.5).