News & Events

Hurricane Ida Rainfall and Storm Surge has impacts in Louisiana, Mississippi, and Alabama

September 10 2021

Envirosite Provides Environmental Data to Aid
in Hurricane Ida Cleanup Efforts.



Hurricane Ida made landfall on August 29 at 11:55 am CDT near Port Fourchon, Louisiana, as a Category 4 hurricane with winds around at 160 mph. In addition to high winds, the storm produced over 10 inches of rain in some areas of Louisiana and Mississippi. Power outages were significant and widespread in Louisiana. The National Hurricane Center published Hurricane Ida storm surge maps for the affected states. We combined the National Hurricane Center's Storm Surge data with Envirosite's comprehensive environmental and geospatial data sets to help aid public officials and environmental professionals.

Envirosite's Storm Surge impact analysis indicates the highest number of contaminated sites at risk of flooding in Louisiana are in Terrebonne and LaFourche Counties. For Mississippi, the highest number of contaminated sites at risk are in Harrison and Jackson Counties. For Alabama, the highest number of contaminated sites at risk are in Mobile County.

Figure 1: Map showing Contaminated Sites for the Hurricane Ida inundation areas


Figure 2: Map showing Potentially Contaminated Sites for the Hurricane Ida inundation areas


The affected area maps are available for Louisiana, Mississippi, and Alabama. The Envirosite contaminated and regulated sites data related to Hurricane Ida can be downloaded here.

Hurricane Ida Sites

Group/SubGroup Louisiana Counts Mississippi Counts Alabama Counts
    Superfund NPL, NPL-Related 188 38 33
    State Hazardous Waste sites 241 383 8
    Brownfields  103 36 6
    Spills, Other contaminated sites 1804 251 103
    RCRA Regulated sites 2162 115 132
    Above Ground Storage Tanks (bulk storage)    84 4 86
    Gas Stations and Underground Storage Tanks 3110 552 149
    Other potentially contaminated sites 124 22  39
State Totals 7816 1401 556

Hurricane Ida Inundation 

Here is the legend for the NHC Potential Storm Surge Flooding Map
1 = 0 to 1 foot above ground
2 = Greater than 1 foot above ground
3 = Greater than 3 feet above ground
4 = Greater than 6 feet above ground
5 = Greater than 9 feet above ground

Questions may be directed to Niem Tash, Data Initiatives Manager at