Flooding & Public Health: What You Need to Know

Flooding & Public Health: What You Need to Know 

Floodwater can carry sewage, chemicals, and other harmful contaminants. After flooding, it’s important to protect yourself, your family, and your home. Below are some trusted resources and simple steps you can take to stay safe. 

Why Floodwater Is Unsafe 

Floodwater often contain:
-Sewage and bacteria
-Chemicals and fuel
-Sharp debris
-Mold and mildew
-Contaminated soil and household waste

Avoid touching floodwater when possible. Keep children and pets away.
 

Learn more: 
WA DOH– Floodwater Safety: Floods | Washington State Department of Health 

Septic Systems During Floods 

Flooding can overwhelm septic systems, leading to sewage backups or contamination around your home.
 
If your yard or drainfield is flooded:
-Limit all water use (showers, laundry, sinks, toilets)
-Do not flush toilets until the system has drained and dried
-After flooding, have a licensed septic professional inspect the system

More information: 
WA DOH– Septic System Guidance for Floods: Floods and Septic Systems | Washington State Department of Health 

Well Water Safety 

Floods can contaminate private wells with sewage, chemicals, and harmful bacteria.
 
If your well has been flooded:
-Do not drink the water
-Use bottled or boiled water until your well has been tested. BFHD Water Laboratory offers testing for private wells.
-Have your well disinfected after flooding

Learn more: 
BFHD Water Lab and Drinking Water: Water Health & Lab Services - Benton Franklin Health District 

Mold After Flooding 

Mold growth can begin within 24–48 hours after flooding. Mold can trigger asthma, allergies, and other respiratory problems. 

To reduce mold risk:
-Dry out your home as quickly as possible
-Remove wet carpets, furniture, and porous materials
-Ventilate the area with fans and open window
-Wear protective gear when cleaning

Guidance: 
CDC – Mold Cleanup After Disasters: 8 Tips to Clean up Mold | Natural Disasters | CDC 
 

Preparing Before a Flood 

A few steps can help reduce health risks:
-Know if you live in a flood-prone area
-Prepare an emergency kit with water, food, medications, and supplies
-Protect important documents
-Know evacuation routes
-Have a family communication plan

More info: 
CDC – Preparing for Floods: Preparing for Floods | Floods | CDC 

If You Need Help 

Contact The Benton-Franklin Health District at (509) 460-4205 for:

-Septic system questions
-Well water testing
-Safe cleanup guidance
-Mold and indoor-air-quality concerns