On September 13, 1977, Philippine President Ferdinand Marcos issued Presidential Decree No. 1196 creating the municipality of Doña Remedios Trinidad. The largest in Bulacan, it is partially embracing two major portions of the Angat Watershed reservation. Bulacan forest reserve, Biak-na-Bato National Park and 327.3 km² of alienable and disposable public land.
The municipality covers seven barangays, originally part of Angat, Norzagaray, and San Miguel. These are Pulong Sampaloc and Camachile of Angat; Bayabas and Kabayunan of Norzagaray; Talbac, Camachin and Kalawakan of San Miguel.
Bulacan P 11-billion bulk water supply project
On December 12, 2007, Bulacan and the Metropolitan Waterworks and Sewerage System (MWSS) signed an agreement for the development of an P11-billion bulk water supply project. Ayala-owned Manila Water Co. Inc. will implement the project. MWSS and Manila Water will provide a financial package of an infrastructure grant, a P10-million development assistance and a P10-million royalty fee to the towns of Norzagaray and Doña Remedios Trinidad, which will host the water supply project.