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City of Davis Pool, Spa and Fountain Program

Pollution prevention starts with your help.

Maintaining Pools,Spas and Fountains

  • For best results, consistently clean and maintain your filtration and circulation systems and pool.
  • Manage pH and water hardness to minimize corrosion of copper pipes.
  • Resolve persistent algae problems without copper algaecides. For more information about non-copper algae prevention, consult your pool chemical supplier.

Filter cleaning

  • Never clean a filter in the street or near a storm drain! Instead rinse cartridge filters onto a dirt area, and spade filter residue into soil.
  • If there is not a suitable dirt area, call City of Davis Public Works at (530) 757-5686 for instructions on discharging filter backwash or rinse water to the sanitary sewer.
  • Backwash diatomaceous ear th filters onto dirt. Dispose used diatomaceous earth in the garbage.

Draining pools or spas

  • Do not discharge chlorinated pool, spa or fountain water to the street or storm drain. This water eventually flows to the Sacramento River.
  • It is almost always possible to discharge chlorinated water to an on-site sanitary sewer cleanout.
  • When draining a pool to the sanitary sewer, prevent backflow by maintaining an “air gap” between your discharge line and the sewer line (i.e., do not seal the connection between hose and sewer line. )
  • De-chlorinated water can be discharged to the storm drain.

Did you know...

Water treatment devices shall be under a separate permit.

Chlorine levels higher than 0.01 ppm (parts per million) can be harmful to aquatic organisms and exceed levels allowed by the State Department of Fish and Game. The typical chlorine level maintained in a pool is 2-4 ppm!

The installation of an automatic fill device for a pool requires the addition of a backflow device in order to protect the potable water supply of the City of Davis water system. Contact the Building Division at (530)757-5610 for any questions concerning this.

When it’s time to drain a pool, spa, or fountain, please call City of Davis Public Works at (530) 757-5686 for further guidance on flow rate restrictions, backflow prevention, and handling special cleaning waste (such as acid wash). Discharge flows should be kept to the low levels typically possible through a garden hose. Higher flow can cause overflows and flooding.

For more pollution prevention solutions contact City of Davis Public Works Department at (530) 757-5686, or visit the City of Davis web site

Where Does the Water Go?

What happens to water from rain, lawn watering, or car washing? This water, called stormwater or urban runoff, flows in to the City’s storm drainage system through over 2500 curbside catch basins – the openings located along street gutters. The water moves through the storm drain piping below our streets to our rivers, creeks, wetlands, sloughs, the delta, the bay, and eventually the Pacific Ocean.

Initially, much of this water fills the City’s detention and wildlife ponds which support an array of wildlife species. Other water flows through drainage ditches towards the northern and eastern edges of the City.

A portion of the stormwater that is collected in the City is conveyed to the Davis Wetlands where it is used to support this constructed wetlands system and all its wild inhabitants. Tours of the Davis Wetlands are offered the first Saturday of the month. For more information contact the Yolo Basin Foundation: (530) 757-4828.

Protect Our Wetlands

Our local watershed is comprised of a delicately balanced ecosystem. Creeks, ponds and wetlands are home to numerous species of plants and animals. These species rely on the abundance of smaller organisms that support the food web. These organisms can be harmed by discharges of material and wastes from an array of urban activities.

To remind everyone about the importance of preventing pollution of our stormwater, be it from concrete and mortar activities, or other sources, the City of Davis has installed these storm drain inlet markers near each drain:

storm-drain-markerThese markers are easy to install. So if you, your group, or organization would like to participate in this pollution awareness program, please contact City of Davis Public Works at (530) 757-5686.

Please keep our watershed clean!



Stormwater pollution can be extremely harmful to the health of the plants and animals with which we share this planet.

Help us to protect your water resources for current and future generations.

If you see anyone dumping questionable materials, please call City of Davis Public Works at (530) 757-5686. If it is an emergency, call 911.

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