IICRC S500 Water Categories Shape Duluth Restoration and Insurance Coverage Post-Isaias
Duluth, United States - November 15, 2026 / Peachtree Mitigation /
DULUTH, Ga. – The source of the water inside a storm-damaged Duluth home sets both the cleanup protocol and the path of the insurance claim, according to Peachtree Mitigation's Duluth restoration team, which handles water damage restoration across Gwinnett County.
The remnants of Hurricane Isaias crossed north Georgia on Oct. 10, a day after the storm made landfall in Florida as a Category 2 hurricane. The National Weather Service issued a flash flood warning that morning for Gwinnett, DeKalb, Fulton, Clayton, Henry and Rockdale counties, and thousands of Gwinnett County customers lost power, according to PowerOutage.us.
The water damage standard published by the Institute of Inspection, Cleaning and Restoration Certification (IICRC), known as S500, classifies water by contamination. A Peachtree Mitigation guide on Category 1 and Category 3 water in Duluth homes lists sewer lines overloaded by heavy rain, which can push sewage back through basement floor drains and toilets, as a Category 3 source. Surface runoff that carries lawn fertilizers and animal waste into basements falls in the same category. Sump pump failures fall under Category 2.
"A clean supply-line leak is one job. Water that came up a floor drain, ran across a yard or blew in during a storm is a different job entirely," said Joe Preston, owner of Peachtree Mitigation. "Once it's Category 3, the carpet pad and the bottom of the drywall come out, the area gets contained, and everything left gets treated before drying starts."
The company's Category 3 protocol calls for negative-pressure containment, followed by removal of saturated drywall up to 24 inches above the water line along with padding and insulation. Remaining surfaces are treated with Environmental Protection Agency-registered antimicrobials, and low-grain refrigerant (LGR) dehumidifiers run with daily moisture readings until materials reach dry standards.
Time can also change the classification: clean water can degrade, often within about 48 hours in warm, humid conditions, the guide notes. The company dispatches emergency crews around the clock from its Duluth base.
Insurance coverage often follows the water's source as well, though terms vary by policy, according to the guide. Sudden and accidental discharges are generally covered, water backing up through sewers or drains usually requires a separate water backup endorsement, and overland flooding requires flood insurance such as the National Flood Insurance Program.
"People are standing in a wet basement wondering if it's safe and whether they're covered," Preston said. "The first thing we sort out for them is where the water came from. Sometimes it's a small clean-water job, and we tell people that straight."
About Peachtree Mitigation
Peachtree Mitigation is a locally owned and operated disaster restoration company headquartered at 2180 Satellite Blvd., Suite 400, in Duluth, Georgia. Its trained and certified technicians provide 24/7 water damage restoration, structural drying, mold testing and remediation, crawlspace encapsulation, and fire and smoke damage restoration for residential and commercial properties across Gwinnett, Fulton and Forsyth counties. Owner Joe Preston has more than 10 years of field experience in north Georgia.
Contact Information:
Peachtree Mitigation
2180 Satellite Blvd NW Ste 400
Duluth, Georgia 30097
United States
Joe Preston
+1-404-480-9525
https://www.peachtreemitigation.com
