Stormwater - Cement and Masonry


Masonry activities create wastes are among the many common stormwater pollutants that can degrade water quality.  Cleaning masonry tools and equipment generate a variety of wastes.  Excess cement and rinse water are a couple of examples.  It is illegal to dispose of these wastes to the storm drain system!  Cement dumped into the storm drain system can cause blockages which can result in flooding.  Rinse water from cleaning tools and equipment is toxic to plants and aquatic life.

Your Regulatory Requirements - County of San Diego, Stormwater Ordinance

What can I do?
Use Best Management Practices (BMPs)!
BMPs are techniques or controls used to prevent or reduce the discharge of pollutants, such as cement rinse water, into the stormwater conveyance system also known as the storm drain system.

Helpful Information and Documents:
General Stormwater BMP Brochure
Cement & Masonry presentation
Pollutant Impacts on Water Quality
San Diego County Wastewater Agencies
CASQA BMP Handbooks

Tip: Use designated washout areas.

Back to Main Watersheds Topics and Activities Home Page

If you have questions or would like additional information, 
call the County Stormwater hotline at 1(888) 846-0800
or e-mail us at

Report a Stormwater Violation On-Line
Department of Public Works
Watershed Protection Program
5510 Overland Ave., Suite 410, MS O326
San Diego,  CA  92123,  USA
(858) 495-5318           Fax: (858) 495-5263