St. Louis County, MO Noise from Specific Sources: Low-Frequency Bass Limits (2026)
Key Facts
- Standard
- Vibration above "perception threshold" at property line
- Numeric trigger
- Over 0.5 in/sec RMS vertical velocity
- Exception
- Blasting under county Explosives Code, Ch. 711
- Enforcing agency
- Dept. of Community Health and Medical Care Director
- Penalty
- Up to $1,000 fine or 1 year jail
- Correction notice
- Up to 60 days to abate before charges
Summary
St. Louis County's Noise Control Code bans vibration, not just audible sound, from crossing onto a neighbor's property. Section 625.060 makes it unlawful to cause any operation or activity that generates vibration above the human perception threshold at the property line, a standard the Department of Community Health and Medical Care applies to bass-heavy stereo systems, subwoofers and mechanical equipment alike.
Perception threshold: The minimum vibrational motion necessary to cause awareness of the existence of the vibration by direct means, including but not limited to, sensation by touch or visual observations. Any vibration which produces more than five-tenths (0.5) inch/second root mean square vertical velocity shall be deemed sufficient to cause the awareness of the existence of the vibration by direct means. ... No person shall cause or allow any operation nor engage in any activity causing vibrations to be generated which are greater than the perception threshold at any point outside of the boundary of the property where the source of the vibrations is located; provided, however, vibrations caused by blasting operations conducted in accordance with the requirements of Chapter 711, SLCRO 1974, as amended, The Explosives Code, shall not be subject to the provisions of this section.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 85 | Traffic: Supplement 80).
Full Breakdown
Chapter 625, the county's Noise Control Code, treats vibration as a distinct pollutant from ordinary sound and regulates it under a strict standard rather than the decibel tables used for airborne noise. 060 prohibits any operation or activity that generates vibrations greater than the perception threshold at any point outside the boundary of the property where the source is located. 5) inch per second root mean square vertical velocity is deemed sufficient to cause that awareness. 050. 060 covers blasting operations conducted under the county's Explosives Code, Chapter 711.
170; if entry is refused, the Director asks the County Counselor to obtain a search warrant. 080 specifying a correction deadline of up to sixty days before the county pursues formal charges.
Violations & Fines
A conviction under the Noise Control Code, including a vibration violation of Section 625.060, carries a fine of up to $1,000, up to one year in the County Jail, or both, under Section 625.180. Each day the vibration continues is a separate offense, and the County Counselor can also sue in circuit court for an order compelling compliance.
Frequently Asked Questions
Can my neighbor's subwoofer violate St. Louis County's noise code even if it isn't loud?
Does the vibration rule apply to construction equipment or blasting?
Who enforces the vibration standard and what happens after a complaint?
What is the penalty for a vibration violation?
Sources & Official References
Other rules in St. Louis County
Compare St. Louis County to another location·View the Missouri noise from specific sources overview
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