Aircraft modification engineer Robert W. Lillibridge and Northrop test pilot Errol Williams purchased the vacant acreage for the airport.

The costs of subsequent improvements were financed by millionaire businessman Jim Annin.

1404-(5) was granted by the Regional Planning Commission of Los Angeles County.

In the 1990s, local residents fought an attempt by Los Angeles County to buy the airpark and convert it to a regional airport.

Agua Dulce Airpark covers an area of 108 acres (44 ha) which contains one asphalt paved runway (4/22) measuring 4,600 x 50 ft (1,402 x 15 m).