Protecting Public Health and the Environment.

Flood Information

Some  parts of  Idaho can experience  severe  flooding  as  a result of spring rains, heavy thunderstorms, rapid winter snowmelt, or the impact of wildfires in the state’s watersheds. This page provides information on how to prepare before, during, and after a flood.

Drinking Water

Drinking water quality can be compromised during extensive flooding. Regardless of whether you have your own water supply, get water from a public water system, or operate a public water utility, you might have to take special steps to ensure that your drinking water is safe if your well, public water system, or water treatment plant has been flooded. General guidelines are listed below.

Private Wells

Public Water Systems

Septic Systems

If flooding has occurred, homes may have a damaged or failing onsite sewage system. Check the  system after heavy rainfall or flooding since the  wastewater leaving  the septic tank may not be able to seep into the already saturated soil.

Underground Storage Tanks

During floods, underground storage tank (UST) systems can become submerged or displaced by flood waters, leading to damaged UST systems or releases of regulated substances into the environment.

Hazardous Materials

One of the most common problems after a flood is displacement of drums, tanks, and other containers that hold hazardous materials.

Other Resources


Regional Office Contact Information

DEQ Boise Regional Office
1445 N. Orchard St.
Boise, ID 83706
ph: (208) 373-0550
fx: (208) 373-0287
toll-free: (888) 800-3480

DEQ Coeur d'Alene Regional Office
2110 Ironwood Parkway
Coeur d'Alene, ID 83814
ph: (208) 769-1422
fx: (208) 769-1404
toll-free: (877) 370-0017

DEQ Idaho Falls Regional Office
900 N. Skyline Drive, Suite B
Idaho Falls, ID 83402
ph: (208) 528-2650
fx: (208) 528-2695
toll-free: (800) 232-4635

DEQ Lewiston Regional Office
1118 "F" St.
Lewiston, ID 83501
ph: (208) 799-4370
fx: (208) 799-3451
toll-free: (877) 541-3304

DEQ Pocatello Regional Office
444 Hospital Way, #300
Pocatello, ID 83201
ph: (208) 236-6160
fx: (208) 236-6168
toll-free: (888) 655-6160

DEQ Twin Falls Regional Office
650 Addison Avenue West, Suite 110
Twin Falls, ID 83301
ph: (208) 736-2190
fx: (208) 736-2194
toll-free: (800) 270-1663