Novato, CA Noise Ordinances: Decibel Limits (2026)

Section 19.22.070 (Noise and Construction Hours) of the Novato Zoning Ordinance bars uses, activities and processes from generating or emitting noise or sound in excess of Table 3-5 beyond the property line of the parcel where they are located. Division 19.22 applies to all new and existing land uses in all zoning districts under section 19.22.020.

Table 3-5 (Allowable Exterior Noise Levels) has three land use rows. Residential is limited to 45 dBA from 10 p.m. to 6 a.m. and 60 dBA from 6 a.m. to 10 p.m. Commercial is limited to 60 dBA at night and 70 dBA from 6 a.m. to 10 p.m. Industrial or manufacturing carries one figure, 70 dBA at any time.

The table notes change how those numbers work. Note (1) reduces each limit by 5 dBA for impulse or simple tone noises, and if the ambient noise exceeds the resulting standard, the ambient is the standard. Note (2) says the maximum level cannot be exceeded for an aggregate period of more than three minutes within a one-hour time period, or by more than 20 dBA at any time. Note (3) applies the residential standards to sensitive receptors such as schools, hospitals, libraries, group care facilities and convalescent homes, and says those uses can require special mitigation. Note (4) applies the commercial standards to Mixed Use Districts.

Subsection C fixes the method. Exterior noise is measured at the property line of the noise source, with a sound level meter on the A weighted scale at slow meter response, and fast response only for an impulsive noise.

Subsection B exempts aerial warning devices required by law, emergency vehicle responses and equipment used in a declared state of emergency, airport and railroad operations, authorized construction and grading within set hours, routine maintenance, and other construction authorized in writing by the Community Development Director.