Concrete Work

It is illegal to allow anything other than rain water to be discharged to a storm drain.

Wash water should never be discharged to a street, gutter, parking lot, or storm drain. If discharged or disposed of improperly, materials such as concrete, stucco, and mortar washouts and slurries, and sealants can be harmful to water quality and creek habitats.

Individuals and businesses that improperly handle and dispose of non-stormwater materials down the storm drain are both subject to civil and criminal prosecution.

Best Practices:

  • Only schedule projects during dry weather.
  • Contain all water and materials used.
  • Only mix up as much concrete as you will need.
  • Cover and protect unused, left over, and stored bags.
  • Block storm drain inlets.
  • Sweep up dry materials.
  • Wash equipment and trucks only in designated wash-out areas.
  • Use a tarp under equipment for easier clean-up of spilled material.
  • Use as little water as possible when making saw cuts. Shovel or vacuum saw-cut slurry and remove from the site.
  • Promptly recycle or dispose of debris and wastes in accordance with federal, state, or local regulations.

Are You Ready to Respond to a Spill?

  • Have a written plan.
  • Train employees annually on storm water regulations, spill response, personal safety, and hazardous waste handling and disposal.
  • Have spill cleanup materials onsite.
  • Have Safety Data Sheets for all products used.

Report Spills Here

Cloverdale: (707) 894-2150
Cotati: (707) 665-3605
Healdsburg: (707) 431-7000
Rohnert Park: (707) 588-3300
Santa Rosa: (707) 543-3800,
After Hours: (707) 543-3805
Sebastopol: (707) 823-5331,
After Hours: (707) 829-4400
Ukiah: (707) 463-6288
Unincorporated County of Sonoma: (707) 565-1900
Unincorporated Mendocino County: (707) 234-6679
Windsor: (707) 838-1006,
After Hours: (707) 838-1000

Releasing pollutants into the storm drain system or a waterway is prohibited by local ordinance, state, and federal law.