A second run of the show starring the 54-year-old "X-Files" actor has been ordered by the network, reported Deadline.
Duchovny stars as a Los Angeles police officer tracking down Charles Manson in the series.
The show's two-hour pilot premiered on NBC last month, drawing in an audience of 5.67 million; the rest of the season was then released via streaming video.
NBC Entertainment president Jennifer Salke said: "With its riveting drama and innovative release strategy, 'Aquarius' has excited the critics, hooked millions of viewers and energised our summer.
Duchovny is currently filming six new episodes of "The X-Files" with Gillian Anderson in Vancouver.