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Water issues: Preliminary test results advisory


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Flood water precautions

The U.S. Environmental Protection Agency and the U.S. Department of Health and Human Services are cautioning the public and all responders about the potential hazards associated with flood waters.

Every effort should be made to limit contact with flood water due to potentially elevated levels of contamination associated with raw sewage and other hazardous substances.

More guidelines
Map of sample testing areas

EPA and CDC Report High Levels of Bacterial Contamination in Preliminary Floodwater Samples from New Orleans
September 8, 2005

Floodwaters from six locations across the New Orleans area were sampled by EPA and analyzed for chemicals and bacteria. These initial results represent the beginning of extensive sampling efforts and do not represent the condition of all flood waters throughout the area. Preliminary information indicates that bacteria counts for E. coli in sampled areas greatly exceed EPA’s recommended levels for contact. At these levels, human contact with water should be avoided as much as possible. Map of sampled areas.

Chemical sampling was performed for over one hundred priority pollutants such as volatile organic compounds (VOCs), semivolatile organic compounds (SVOCs), total metals, pesticides, herbicides, and polychlorinated biphenyls (PCBs). Results from these analyses were compared to various Agency for Toxic Substances and Disease Registry (ATSDR) and EPA health levels. Lead concentrations in flood water exceeded drinking water action levels. These measured levels are a concern if flood water were to be a child’s source of drinking water. For the other chemicals tested, we have yet to detect contaminant levels that would exceed the EPA and ATSDR health levels. Due to the priority of the search and rescue mission, EPA testing has occurred in several highly populated residential neighborhoods and not yet in heavily industrialized areas.

Given these preliminary results, emergency response personnel and the public should avoid direct contact with standing water when possible. In the event contact occurs, EPA and CDC strongly advise the use of soap and water to clean exposed areas if available. Flood water should not be swallowed and all mouth contact should be minimized and avoided where possible. People should immediately report any symptoms to health professionals. The most likely symptoms of ingestion of flood water contaminated with bacteria are stomach-ache, fever, vomiting and diarrhea. Also, people can become ill if they have an open cut, wound, or abrasion that comes into contact with water contaminated with certain organisms. One may experience fever, redness, and swelling at the site of the infection and should see a doctor right away if possible.

Additional information regarding health and safety issues for both the public and emergency responders can be found on the Center for Disease Control (CDC) website (http://www.bt.cdc.gov/disasters/hurricanes/index.asp) and the Occupational Safety and Health Administration's (OSHA) website (http://www.osha.gov/OshDoc/hurricaneRecovery.html).

Preliminary flood water testing data will be confirmed through additional EPA testing and data analyses to ensure high quality. EPA is implementing a scientific process to ensure that the flood waters of New Orleans are thoroughly sampled for multiple types of key contaminants as appropriate. EPA is actively coordinating all sampling activities and data analyses with federal, state, and local agencies.

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Flood water sampling map

View a high-resolution of this map (JPG 152K) (click "back" on your browser to return here)
More information about flood water.

Map showing the greater New Orleans dry and flooded areas and the Lake Ponchartrain shoreline.  Flood water sampling sites are marked as colored dots, spread mainly through the central and central-east areas of New Orleans.  Map title is Surface Water Sampling Sites 09/03/05, 09/04/05, 09/05/05, 09/06/05.

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