California's SB 576 Extends TV Ad Volume Rules to Streaming

Starting July 1, 2026, California will require streaming platforms like Netflix and Hulu to keep commercials at the same loudness level as the shows and movies around them. Governor Newsom signed SB 576 in October 2025, formally extending a regulatory framework that broadcast and cable TV have operated under since 2010.

The rule applies a federal measurement standard called ATSC A/85, the same benchmark that the Commercial Advertisement Loudness Mitigation (CALM) Act imposed on broadcast television. For over a decade, CALM prevented the annoying jump in volume when a commercial came on — broadcasters could no longer compress audio to push ads to their loudest technical ceiling while leaving the surrounding program quieter.

Before CALM existed, this was a widespread nuisance. Advertisers exploited a gap: television standards allowed a certain peak loudness level, but most programs ran at a lower average level. That headroom meant advertisers could push commercials to the peak while the show stayed lower, creating the jarring volume spike viewers experienced when changing channels.

Streaming services grew up outside that regulatory requirement. When the internet emerged as a distribution channel, the CALM Act's scope stopped at broadcast and cable operators. As ad-supported streaming tiers became common — Netflix launched its ad tier in late 2022, followed by Disney+ and most other major platforms — that same loudness problem followed viewers to their connected devices.

SB 576 closes the gap in California by anchoring streaming platforms to the existing federal standard. Rather than create a new technical specification unique to streaming, the law reuses the measurement framework already in place. For a platform that operates both broadcast and streaming services and already maintains CALM compliance on the broadcast side, the engineering work is largely a matter of applying the same loudness normalization to the streaming ad stack.

The enforcement challenge, though, is substantially different from broadcast. Checking a broadcast signal is straightforward — regulators sample what comes out of a transmitter. Streaming is fragmented: audio normalization can happen on the server at the ad insertion point, on the viewer's device in the media player, or at various layers in between. Different devices, internet service providers, and user sessions may handle the audio differently, making consistent compliance across millions of concurrent streams a legitimate operational problem.

Here's where the broader context matters: California's market size has historically functioned as a de facto standard-setter, even for national behavior. The state's auto emissions rules are the classic example, and content regulation has followed similar patterns. If streaming platforms choose to adjust their ad delivery systems nationwide rather than maintain separate California-specific handling, the practical effect of SB 576 could extend far beyond state lines. How the platforms respond in the coming months will be worth watching.

The law's origin story is revealing. Reports indicate the bill was partly inspired by a case where an infant was startled awake by a sudden blast of advertisement audio — the kind of mundane irritation that tends to generate lasting legislative momentum. The CALM Act itself came from years of viewer complaints. Both laws emerged from a similar gap: viewers noticed a problem between regulated channels (broadcast) and unregulated ones (first cable, then streaming) long before regulators caught up.

For the engineering and ad operations teams at streaming platforms, the practical deadline arrived in October 2025 when the law was signed, and the compliance date is now imminent. The technical requirement is clear, the reference standard exists, and the effective date is four days away. What happens next — how California investigates complaints, what penalties violations carry, and whether the FCC or Congress eventually extends CALM Act jurisdiction to all streaming services federally — remains an open question. But those are secondary concerns compared to getting loudness normalization correctly implemented before the law takes effect.