Precautionary Boil Water Notices
When there is a loss in water pressure, either due to a broken water pipe, loss or power and/or system pressure, or a scheduled outage for repairs, a Precautionary Boil Water Notice (PBWN) is issued.
When the number of affected customers is limited, each affected household or business is informed individually using a printed notice hung on the front door. Otherwise, the Tampa Water Department publishes Precautionary Boil Water Notices in these ways: media releases, RSS feeds, informational Alert Tampa emails, "The Pipeline" electronic newsletter, Twitter, Facebook, and via email blasts to registered Neighborhood Association contacts.
When the water main loses pressure, either due to a broken water main or a scheduled outage, it is possible that contaminants can seep into the pipes. This might allow pathogens (disease‐causing germs) into the water that can cause illness if one drinks it or prepares food or beverages with it.
As a precaution, it is important to disinfect tap water to kill any bacteria or viruses that may have entered the water. Under a PBWN, water used for consumption can be disinfected by any one of the following methods:
- Bringing the water to a rolling boil and holding it there for one minute.
- If you cannot boil water, such as during a power outage, use a disinfecting chemical. You should put eight drops of common household bleach which is about 1/8th teaspoon, into one gallon of tap water, then shake it, and allow it to stand for 30 minutes before drinking. Use food grade containers and common household bleach that has 5% to 6% active ingredients. Bleach that has perfume scents added should not be used.
- If the water is cloudy, use sixteen (16) drops, about ¼ teaspoon of bleach instead of 8, shake it, and let it stand for 30 minutes.There should be a slight chlorine odor.
- Using water purification tables or iodine that many sports and camping stores sell.
Water treated using one of the above methods can be used for drinking, cooking, making ice, brushing teeth. You also can buy commercial bottled water for consumption and food preparation.
Businesses and non‐residential sites should take steps, such as posting notices at, or disabling water fountains and ice machines, during the PBWN. If you provide water to visitors or employees, use a commercially produced bottled water for drinking or beverage preparation. Food service operations should contact their regulatory agency for any additional requirements.
After the water system is repaired and the pressure is restored in the pipes to your home or business, the precautionary boil water notice will remain in effect for several days while bacteria tests are conducted to assure the safety of the water. The notice will be lifted (rescinded) only after tests confirm the water is safe to drink.
When a small number of members are affected, the rescind notice will be delivered similar to delivery of the boil water notice. Otherwise, the rescind notice will be distributed via the same methods used for the initial distribution.
The employees of the Tampa Water Department take great care in assuring that your water is safe to drink. We appreciate your cooperation with the PBWN policy, which ensures public health during water outages.
Additional resources include:
- Recommendations for water use when a PBWN is in place;
- Recommendations for businesses, non-residential sites and service providers.
Call the Utility Services at (813) 274-8811, option #3, during business hours if you have questions or concerns about a PBWN issued.