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Earthquake Tips

Any time an earthquake occurs in Southern California, discontinue all non-essential water use in the home until learning of the extent of the damage to the water supply. Ninety percent of San Diego County's water arrives here through pipelines that cross three major earthquake faults to the north. An earthquake occurring hundreds of miles from here could sever the imported water pipelines, leaving residents dependent on the limited local supply until the damage is repaired. Every household should plan to be self-sufficient for a minimum of 72 hours after a major earthquake. Here are some tips to take to ensure a household has enough water on hand following an earthquake.

  • Household earthquake kits should include: at least three gallons of water per family member (one gallon per day). The water should be in sealed, unbreakable containers and stored in a cool, dark place. If storing the water containers in a kit such as a trash can, place them in the middle of the can so they aren't crushed by the weight of other supplies. Date the containers and replace them every six months.
  • Water for pets.
  • A small container of unscented household chlorine beach and/or water purification tablets for purifying water as necessary.
  • A propane stove or charcoal grill to boil water. Have propane or charcoal on hand as appropriate, as well as matches.
  • Remember to include drinking water in the car earthquake kit. 
  • If the household water supply is damaged, shut it off at the main valve.
  • Besides bottled water, drinking water from the water heater, melted ice cubes or toilet tank (but only if no disinfectant cleaner is used) are more options.
  • Use pool or spa water only for non-drinking purposes because of its chemical content.
  • To ensuring pure water purify water by boiling it vigorously for one to three minutes. If gas and/or electric service is unavailable, use a propane or charcoal stove. Burn the stove outdoors to avoid carbon monoxide poisoning.
  • To disinfect water, first strain it through a clean cloth to remove solids.
  • If the water is clear, disinfect it by using eight drops of unscented household chlorine bleach per gallon. Double the amount if the water is cloudy.
  • Let the water stand for 30 minutes. When detecting a slight chlorine odor, the water is safe to use. Otherwise, repeat the process and let the water stand for another 15 minutes.
  • Disinfect water by using water purification tablets.

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