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A perforated or slotted pipe beneath a constructed soil bed that removes excess water from the bed.

Underground Detention

Usually consists of vaults or piping systems used to store stormwater to eventually infiltrate or be used for irrigation or domestic purposes. This is an alternative to storage aboveground such as in a retention pond. Underground detention is sometimes constructed beneath permeable pavement.

Unmetered Residential Property

Property used only for human residency, which is not metered residential property.


The occupant or owner of the property, or any person served by the System or discharging into the District’s system.

Also known as Customer.

User Charge

The major charges established by the District; wastewater user charge and stormwater service charge.