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The company began January 4, 1886, by the founding of the Springfield Water Company. The company changed its name to the Philadelphia Suburban Water Company (PSW). By 1925 the company provided water to 58 municipalities.
The company was incorporated in 1989.
The current CEO, Christopher H. Franklin, took his position in 2015.
In late 2014, the company committed to transitioning its Pennsylvania vehicle fleet to compressed natural gas (CNG) within five years.
In October 2025, American Water Works agreed to acquire the company in an all-stock merger, creating a combined company valued at $63 billion, including debt. Upon completion of the deal, expected in early 2027, American Water shareholders would own about 69% of the combined company, with Essential shareholders owning the remainder.