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Wet Weather Preparedness

Each year, LA Sanitation (LASAN) prepares Los Angeles residents and businesses for the rainy season.

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Fast Facts

  • Rainy season in Los Angeles is from October to February.
  • There are 6,700 miles of sewer pipes in Los Angeles, and LASAN conducts proactive maintenance year-round to prevent clogs, flooding and pests.
  • There are 67 pumping stations to move sewage through the pipes to the plants.
  • The City of Los Angeles has four water reclamation plants. The largest plant can treat up to 600 million gallons per day, enough to fill 909 Olympic-sized swimming pools.
  • Streets are designed for water to flow to the edges of the streets in heavy rains; this can cause flooding on sidewalks, so be aware and watch where you walk.
  • Catch basins will automatically open when it rains: during dry periods, the screens are there to catch trash and other debris.

How does LASAN prepare for wet weather? 

  • LASAN cleans all 40,000 catch basins to remove debris that can cause clogs.
  • LASAN cleans all 70 debris basins, many of which get cleaned multiple times during the wet season to remove debris and keep stormwater flowing.
  • LASAN clears drainage channels to allow stormwater to flow properly.
  • LASAN remains in close communication with other City and County departments to coordinate preparation and response efforts, and to push out collaborative messages as needed.
  • LASAN dispatches emergency crews throughout the City during severe weather to respond to any flooding.
  • The LASAN Customer Care Center is open 24/7 to receive customer requests. During heavy rains, please limit calls to critical and rain-related issues.

What can residents and businesses do to prepare?

  • Check your catch basins to make sure they are clear of debris. Call us at 311 or 1-800-773-2489 for assistance with debris removal.
  • Ensure your building drainage is clear of debris, including rain gutters.
  • Secure any loose palm fronds, tarps, loose items that may be carried away by rain or be blown away by wind.
  • Cover steep slopes on your property that are not vegetated, which may become unstable when saturated by rain.
  • Use sand bags to protect properties in low lying areas. Contact your neighborhood fire station for sandbags.
  • Have alternate evacuation routes out of your neighborhood.
  • If you have sprinklers, turn them off before, during and after rain.
  • Install rain barrels to capture rain. LAWDP provides rebates for up to four rain barrels per property.
  • Please reduce water consumption during rain to reduce flows in our sewers.
  • Create an emergency kit.

What should residents and businesses do during the rain?

  • Monitor radio and TV news for information about weather conditions, flooding in your area and safety precautions being advised.
  • Be aware of notifications of suspended trash service in your area. Don't leave trash containers out during those conditions as they may tip over and clog storm drains and catch basins.
  • Be prepared to leave immediately if an evacuation is ordered.
  • Stay away from flood channels and flowing rivers. You can be knocked off your feet in as little as six inches of water.
  • Don't try to cross flooded areas and never enter moving water.
  • If your home has been flooded, protect your family's health by cleaning up right away. Throw away food and medications that may have been contaminated.
  • Stay away from steep slopes that may become unstable when saturated by rain.
  • Never touch a downed power line, which can cause serious injury or death. Call 9-1-1 to report it.
  • Look out for tilted trees, telephone poles, fences or walls, and for new holes or bare spots on hillsides.
  • If trapped in your vehicle, stay with it. If possible, relocate to the hood if water continues to rise.
  • Be alert when driving. Roads may become blocked or closed due to hazards.
  • Report small problems as soon as they occur, before the turn into bigger problems.