[3] The town got its name after the Tagalog word Angat (A-ngat), meaning elevated or a high piece of land.

On September 13, 1977, Barangays Camachile and Pulong Sampaloc were ceded to the newly established municipality of Doña Remedios Trinidad, by virtue of Presidential Decree No.

The mountainous areas, and lands close to the river shore, some of which are privately owned is rich in mineral deposit of silica.

The vast area around Angat River is very high source of rocks and pebbles used for construction and garden landscaping.

Most areas have a very relaxing atmosphere of greenery seen in mountain heights and river shore lines where some fresh water fishes also multiplies.

Other religious groups include the Members Church of God International popularly known as Ang Dating Daan, Iglesia ni Cristo, and Jehovah's Witness, Methodists, Aglipayans, Adventists, Baptists, Mormons.

This dream was realized in 1983 through the initiative and leadership of the founding members of the first Board of Trustees of Santa Monica Catholic School, Inc.: Bishop Cirilio R. Almario, Jr., Rev.

Macario R. Manahan, Councilor Manuel C. De Guzman, Mrs. Angelita A. Cruz, Mr. Francisco C. Robles.

[18] As a predominantly Roman Catholic Christian community, every barangay has their own unique way of celebrating fiestas in honor of their respective patron saint.

In the town proper where the old beautiful church of Angat is located, the locals celebrate their fiesta every 4 May in honor of its patron St. Monica, mother of St. Augustine.