If you are working on Chennai Flooding on the streets, check out the information from OSHA – and quoting from OHSA

Tips to Remember

• Before working in flooded areas, be sure your tetanus shot is current (given within the last 10 years). Wounds that are associated with a flood should be evaluated for risk; a physician may recommend a tetanus immunization.
• Consider all water unsafe until local authorities announce that the public water supply is safe.
• Do not use contaminated water to wash and prepare food, brush your teeth, wash dishes, or make ice.
• Keep an adequate supply of safe water available for washing and potable water for drinking.
• Be alert for chemically contaminated floodwater at industrial sites.
• Use extreme caution with potential chemical and electric hazards, which have great potential for fires and explosions. Floods have the strength to move and/or bury hazardous waste and chemical containers far from their normal storage places, creating a risk for those who come into contact with them. Any chemical hazards, such as a propane tank, should be handled by the fire department or police.
• If the safety of a food or beverage is questionable, throw it out.
• Seek immediate medical care for all animal bites.