Safe Drinking Water

When power goes out, water purification systems may not be functioning fully. Safe water for drinking, cooking, and personal hygiene includes bottled, boiled, or treated water. Your state, local, or tribal health department can make specific recommendations for boiling or treating water in your area. Here are some general rules concerning water for drinking, cooking, and personal hygiene. Remember:

• Do not use contaminated water to wash dishes, brush your teeth, wash and prepare food, wash your hands, make ice, or make baby formula. If possible, use baby formula that does not need to have water added. You can use an alcohol-based hand sanitizer to wash your hands.
• If you use bottled water, be sure it came from a safe source. If you do not know that the water came from a safe source, you should boil or treat it before you use it. Use only bottled, boiled, or treated water until your supply is tested and found safe.
• Boiling water, when practical, is the preferred way to kill harmful bacteria and parasites. Bringing water to a rolling boil for 1 minute will kill most organisms.
• When boiling water is not practical, you can treat water with chlorine tablets, iodine tablets, or unscented household chlorine bleach (5.25% sodium hypochlorite):
  
  
  • If you use chlorine tablets or iodine tablets, follow the directions that come with the tablets.
  • If you use household chlorine bleach, add 1/8 teaspoon (~0.75 mL) of bleach per gallon of water if the water is clear. For cloudy water, add 1/4 teaspoon (~1.50 mL) of bleach per gallon. Mix the solution thoroughly and let it stand for about 30 minutes before using it.

Note: Treating water with chlorine tablets, iodine tablets, or liquid bleach will not kill parasitic organisms.

Use a bleach solution to rinse water containers before reusing them. Use water storage tanks and other types of containers with caution. For example, fire truck storage tanks and previously used cans or bottles may be contaminated with microbes or chemicals. Do not rely on untested devices for decontaminating water.

Extreme Cold

Cold

Hypothermia happens when a person’s core body temperature is lower than 35°C (95°F). Hypothermia has three levels: acute, subacute, or chronic.

• Acute hypothermia is caused by a rapid loss of body heat, usually from immersion in cold water.
• Subacute hypothermia often happens in cool outdoor weather (below 10°C or 50°F) when wind chill, wet or too little clothing, fatigue, and/or poor nutrition lower the body’s ability to cope with cold.
• Chronic hypothermia happens from ongoing exposure to cold indoor temperatures (below 16°C or 60°F). The poor, the elderly, people who have hypothyroidism, people who take sedative-hypnotics, and drug and alcohol abusers are prone to chronic hypothermia, and they typically:
  • misjudge cold
  • move slowly
  • have poor nutrition
  • wear too little clothing
  • have poor heating system

Causes of Hypothermia

• Cold temperatures
• Improper clothing, shelter, or heating
• Wetness
• Fatigue, exhaustion
• Poor fluid intake (dehydration)
• Poor food intake
• Alcohol intake

Preventing Hypothermia

• Everyone, especially the elderly and ill, should have adequate food, clothing, shelter, and sources of heat.
• Blankets can help, even in poorly heated rooms.
• Wear layers of clothing and a hat, which help to keep in body heat.
• Move around. Physical activity raises body temperature.

Water cooler than 75°F (24°C) removes body heat more rapidly than can be replaced. The result is hypothermia. To avoid hypothermia:

• Avoid swimming or wading in water if possible.
  • If entering water is necessary:
• Wear high rubber boots in water.
• Ensure clothing and boots have adequate insulation.
• Avoid working/playing alone.
• Take frequent breaks out of the water.
• Change into dry clothing when possible.

Helping Someone Who Is Hypothermic

As the body temperature decreases, the person will be less awake and aware and may be confused and disoriented. Because of this, even a mildly hypothermic person might not think to help himself/herself.

• Even someone who shows no signs of life should be brought quickly and carefully to a hospital or other medical facility.
• Do not rub or massage the skin.
• People who have severe hypothermia must be carefully rewarmed and their temperatures must be monitored.
  • Do not use direct heat or hot water to warm the person.
• Give the person warm beverages to drink.
• Do not give the person alcohol or cigarettes. Blood flow needs to be improved, and these slow blood flow.

Power Line Hazards and Cars

If a power line falls on a car, you should stay inside the vehicle. This is the safest place to stay. Warn people not to touch the car or the line. Call or ask someone to call the local utility company and emergency services.

The only circumstance in which you should consider leaving a car that is in contact with a downed power line is if the vehicle catches on fire. Open the door. Do not step out of the car. You may receive a shock. Instead, jump free of the car so that your body clears the vehicle before touching the ground. Once you clear the car, shuffle at least 50 feet away, with both feet on the ground.

As in all power line related emergencies, call for help immediately by dialing 911 or call your electric utility company's Service Center/Dispatch Office.

Do not try to help someone else from the car while you are standing on the ground.

 

Electrical Safety and Generators

Preventing Electrocutions Associated with Portable Generators Plugged Into Household Circuits

When power lines are down, residents can restore energy to their homes or other structures by using another power source such as a portable generator. If water has been present anywhere near electrical circuits and electrical equipment, turn off the power at the main breaker or fuse on the service panel. Do not turn the power back on until electrical equipment has been inspected by a qualified electrician.

If it is necessary to use a portable generator, manufacturer recommendations and specifications must be strictly followed. If there are any questions regarding the operation or installation of the portable generator, a qualified electrician should be immediately contacted to assist in installation and start-up activities. The generator should always be positioned outside the structure.

When using gasoline- and diesel-powered portable generators to supply power to a building, switch the main breaker or fuse on the service panel to the "off" position prior to starting the generator. This will prevent power lines from being inadvertently energized by backfeed electrical energy from the generators, and help protect utility line workers or other repair workers or people in neighboring buildings from possible electrocution. If the generator is plugged into a household circuit without turning the main breaker to the “off” position or removing the main fuse, the electrical current could reverse, go back through the circuit to the outside power grid, and energize power lines or electrical systems in other buildings to at or near their original voltage without the knowledge of utility or other workers.

Effects of Backfeed

The problem of backfeed in electrical energy is a potential risk for electrical energy workers. Electrocutions are the fifth leading cause of all reported occupational deaths. Following the safety guidelines below can reduce this risk.

Safeguards against Backfeed

• Extreme caution must be exercised by persons working on or in the vicinity of unverified de-energized power lines. All persons performing this work should treat all power lines as "hot" unless they positively know these lines are properly de-energized and grounded. Because of the possibility of a feedback circuit, the person performing the work should personally ground all lines on both sides of the work area and wear the proper required protective equipment.
  
• Linemen must be instructed to treat all power lines as energized unless they personally de-energize them by establishing a visible open point between the load and supply sides of the line to be repaired, by opening a fused disconnect, by opening a fused switch, or by removing a tap jumper if the load permits.
  
• Workers must verify that the power lines have been de-energized.
  
• Workers must provide proper grounding for the lines. Unless a power line is effectively grounded on both sides of a work area, it must be considered energized even though the line has been de-energized. Lines must be grounded to the system neutral. Grounds must be attached to the system neutral first and removed from the system neutral last. If work is being performed on a multiphase system, grounds must be placed on all lines. Lines should be grounded in sight of the working area and work should be performed between the grounds whenever possible. If work is to be performed out of sight of the point where the line has been de-energized, an additional ground should be placed on all lines on the source side of the work area.
  
• Persons working on or in the vicinity of power lines should be provided with appropriate safety and protective equipment and trained in procedures that address all magnitudes of voltages to which they may be exposed. Procedures should be established to perform a dual voltage check on the grounded load and supply sides of the open circuit. Once it has been determined that high voltage is not present, low voltage testing equipment, such as a glowing neon light or a light-emitting diode, should be used to determine if lower voltage is present.

Other Generator Hazards

Generator use is also a major cause of carbon monoxide (CO) poisoning. Generators should only be used in well ventilated areas. To learn more about preventing CO poisoning, see Carbon Monoxide Poisoning After a Disaster.