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Soil disturbance during the rainy season (October 15 to April 15) is allowed only if:

Perimeter controls sufficient to prevent eroded materials in storm water from entering the waterway are in place.

Appropriate examples of perimeter control may include, but are not limited to:

  • Silt fencing
  • Straw wattles/ fiber rolls
  • Vegetated berms
  • Straw bale sediment barriers


  • Sufficient materials are available onsite to apply straw mulch at a rate of 2 tons per acre, wood chips at 5 to 6 tons per acre, or some other non-leaching material (use of pomace not permitted) at a rate protective of water quality over all disturbed soils within the setback. Mulch must be in place prior to any rain event forecast by NOAA/NWS: that is likely to produce runoff.

See Appendix C for examples of sufficient and correctly installed cover crop, straw mulch/wood chip application, and perimeter controls. 

Contact Information

Department of Agriculture / Weights & Measures
Business Hours
Monday – Friday
8:00 AM – 4:00 PM
Closed from noon to 1:00 PM for lunch.

Contact us by Phone
Main Office
133 Aviation Boulevard
Suite 110
Santa Rosa, CA 95403

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