Sacramento's S.U.R.G.E. emerged in 2021 with a sludge metal attack that feels distinctly Californian: sun-scorched, distorted, and lumbering under the weight of its own density. Their music channels the industrial edge of the Central Valley into slow-churning riffs and feedback-drenched sonic punishment.

Seven Sisters of Sleep is a sludge and doom metal band from Southern California, formed in mid-2009 from members of Tafkata and The Arm and Sword of a Bastard God. The band built their sound on a foundation of occult-themed, downtuned sludge drawing from doom, death metal, black metal, and d-beat, releasing records on A389 Recordings and Southern Lord, among others. They released multiple full-length albums before disbanding following legal troubles involving a former member, leaving behind a body of work regarded as important within the Southern California heavy underground.

San Diego blackened sludge metal band formed in 2023, fusing black metal's corrosive malice with sludge's thick, punishing low-end into a suffocating and visceral sound.

Los Angeles sludge and doom metal band formed in 2017, operating in the long shadow of the city's thriving heavy underground with dense, slow-moving riffs and the kind of suffocating atmosphere that characterizes the best of the West Coast doom scene. The "sixesdoom" Bandcamp tag underscores where their loyalties lie.

Skaven is an Oakland, California sludge metal and crust punk band formed in 2004, rooted in the Bay Area's long tradition of heavy, filthy music that draws equally from Neurosis and His Hero Is Gone. Their sound is oppressive and slow-burning, built on feedback-soaked riffs and punk urgency.

San Francisco's Skin Horse has been wading through thick sludge and crushing doom since 2016, drawing on the Bay Area's fertile heavy underground to craft slow, oppressive music with the weight of the Pacific behind it.

Corona, California's Skinslip work the intersection of sludge and doom, conjuring slow, weight-bearing riffs that reflect the smoggy, sun-bleached desolation of the Inland Empire since their formation in 2014.

Fresno's Skull Incision have been active since 2010, working in the ugly overlap between death metal, grindcore, and sludge — a combination that makes for short, punishing tracks coated in downtuned filth and California Central Valley grime.

Sacramento's Sky Pig have been combining stoner, sludge, and doom metal since 2018, trafficking in slow-grinding riffs soaked in fuzz and feedback that nod equally to Electric Wizard and Saint Vitus. The band occupies the fertile Central Valley heavy underground, where volume is treated as a virtue unto itself.