[1][2][3][4] The UATP was completed in June 2000, but on November 29, 2004, the tunnel and its facilities were severely damaged because of the effects of Typhoon Unding.

MWSS sought a permanent solution, and this resulted to the Umiray-Angat Transbasin Rehabilitation Project (UATRP).

[5][6] Studies for the UATRP began in 2013 and on December 28, 2015 the MWSS released the Notice of Award to A.M. Oreta Construction.

The P717 million contract was awarded by MWSS and Maynilad to Cavite Ideal International Construction and Development.

[7][5] The project has been beset with delays and a suspension because of a flash-flooding incident resulting to the deaths of six workers and surveyors in 2016.