Stormwater Management

Stormwater is naturally occurring precipitation, and while some stormwater soaks into the ground, much of it turns into runoff and can pick up pollutants like chemicals, automotive fluids, sediment, and litter as it flows over various surfaces. Runoff is channeled into the Town of Paradise Valley’s Municipal Separate Storm Sewer System (MS4). The MS4 has many parts, including washes, catch basins, storm drains, curbs, inlets, scuppers, streets, gutters, retention basins, and any other Town-owned structure that conveys stormwater to waters of the US.

It is important to understand that the MS4 is separate from the sanitary sewer system. The sanitary sewer transfers waste water from residences and businesses directly to the Water Reclaimation Facility for treatment.

In contrast, the MS4 has no treatment process and empties its unfiltered contents directly into basins, drainages, and bodies of water, where it eventually infiltrates into the groundwater. This is why preventing stormwater pollution is so important. Stormwater remains unfiltered as it makes its way through the MS4, so whatever goes down the storm drain can eventually end up in our water supply.

Typical pollutants found in stormwater include trash, fertilizers, household detergents, pool water, pet waste, sediment, gasoline and petroleum products, and hazardous chemicals.

Storm Drainage Design Manual Update

The town is currently in the process of updating its Storm Drainage Design Manual, originally written in 1987.  A proposed draft of the updated document can be downloaded by clicking on the link below.  The updated document seeks to provide the development community the most comprehensive source for storm drainage design, including requirements for Drainage Reports, SWPPP's, storm water facility design guidelines, retention requirements, first flush requirements, etc. for projects within the Town of Paradise Valley. The town will be holding a public meeting on March 21st at 6 PM in the Community Room at Town Hall (6401 E Lincoln Dr) to receive public comments on the document.  If you would like to provide comments prior to the meeting or in writing, please e-mail them to Jeremy Knapp at

Storm Drainage Design Manual - DRAFT

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