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City of Phoenix official website

Structural Controls

Structural controls may be implemented to help minimize stormwater pollution from your property. Some examples of structural controls include: retention basins, drywells, berms and storm drain filtration systems. Structural controls should be cleaned and properly maintained on a regular basis.

​Improper Structural Controls

Improper Structural Controls example

Oily, dirty water leaving the property through fence line.  No berm.

​Proper Structural Controls

berm was constructed to prevent water from leaving site.

Area is clean and berm was constructed to prevent water from leaving site.

Clean and well maintained on-site retention basin.

Clean and well maintained on-site retention basin.