The set also bows at No. 2 on Top Rock Albums & Alternative Albums.
Stone Sour launches atop Billboard's Hard Rock Albums chart for a second time, as Hydrograd debuts with 33,000 equivalent album units (30,000 in traditional sales) in the week ending July 6, according to Nielsen Music.
The band, led by Corey Taylor of Slipknot, previously ruled the chart (which began in 2007) with 2012's House of Gold & Bones: Part 1. Three other albums, beginning with 2010's Audio Secrecy, bowed, and peaked, at No. 2.
The new set, the band's sixth full-length, also starts at No. 2 on Top Rock Albums and Alternative Albums and No. 8 on the Billboard 200, where it's Stone Sour's fifth top 10, dating to the No. 4 debut of 2006's Come What(ever) May.
Concurrently, Hydrograd lead single "Song #3" spends a fourth week at No. 1 on the Mainstream Rock Songs airplay chart and logs a new high in overall rock radio audience (5.5 million audience impressions, up 5 percent).
From Stone Sour to Queens of the Stone Age: the latter rock act may have one of its biggest hits in years on its hands.
"The Way You Used to Do," the lead single from the band's album Villains (due Aug. 25), hits the top 20 on Mainstream Rock Songs (23-20), marking the group's first song to reach the region since "Little Sister" hit No. 13 in 2005. (The band's best-charting track on that airplay chart, "No One Knows," reached No. 5 in 2003.)
R.O.C.K. IN THE U.S.A.: Multiple America-themed anthems storm the Rock Digital Song Sales chart post-Fourth of July, led by Bruce Springsteen's "Born in the U.S.A." at No. 4. The song soared by 616 percent to 10,000 downloads sold in the week ending July 6.
Other such fireworks: Don McLean's "American Pie" (No. 6; 9,000, up 350 percent), Creedence Clearwater Revival's "Fortunate Son" (No. 18; 4,000, up 176 percent) and Lenny Kravitz's "American Woman" (No. 21; 4,000, up 695 percent).