Loss Type: Category 3 Water / Sewage Backup | Location: South Layton near Antelope Drive | Response Time: 39 minutes | Job Duration: 6 days | Insurance: Yes – USAA (sewer backup rider)

The Situation

A homeowner near Antelope Drive in Layton, UT called us at 11:22 PM after discovering sewage had backed up through a floor drain in their finished basement. The backup had occurred during a heavy rain event that overwhelmed the municipal lateral. The basement included finished drywall, a carpeted family room, a laundry area, and a half bath — all of which had been exposed to Category 3 sewage cleanup conditions involving fully contaminated water.

Our crew arrived in 39 minutes with full PPE and containment equipment.

The Problem

Category 3 water losses are the most serious classification under the IICRC S500 standard. All porous materials that came into contact with the sewage — carpet, pad, drywall, and framing within 12 inches of the floor line — are classified as unsalvageable and must be removed and disposed of as contaminated waste. This was a significant demolition scope in a fully finished basement.

Secondary concerns included an existing HVAC air handler located in the basement mechanical room that had been splashed during the event, requiring decontamination before it could be operated. The homeowner carried a USAA policy with a sewer backup endorsement that covered the full scope of the remediation work.

What We Did

We established a containment barrier at the basement stairwell and began sewage backup cleanup using truck-mounted extraction equipment. All contaminated materials were bagged, labeled, and removed in accordance with local health guidelines. Affected materials included:

• Approximately 600 square feet of flooring removal covering carpet and pad throughout the affected area
• Drywall removal and repair covering 18 linear feet cut to 12 inches above the flood line
• All baseboards and door casings in the affected area

Following demolition, all exposed framing and concrete surfaces were treated with an EPA List N disinfectant approved for biohazard decontamination of Category 3 biological contamination. The HVAC air handler was isolated, decontaminated externally, and cleared for operation. We then established a post-demolition structural drying system:

• Commercial dehumidifiers — 3 units running continuously throughout the drying phase
• 6 air movers directed at framing, concrete slab, and exposed wall cavities
• Twice-daily moisture readings logged for the insurance file

Clearance readings were taken by an independent industrial hygienist on day 6 before the job was signed off.

The Outcome

The basement structure was fully dried and cleared. The USAA claim covered the full remediation scope, confirming that the insurance claim process worked exactly as intended for this type of loss. A rebuild contractor was brought in to restore drywall, flooring, and trim. The homeowner also installed a backwater valve during the rebuild to prevent future lateral backups — a step we recommended during the initial assessment. Given the extent of the sewage intrusion in a finished basement, we also advised monitoring for secondary mold remediation needs during the drying period, which the clearance readings ultimately ruled out.

This job is one of several Category 3 sewage cases we have handled across Davis County. For additional context on how we approach this type of loss, see our documentation of a similar Category 3 sewage loss in South Weber and a sewage line backup in Clearfield — both of which involved comparable contamination scopes and insurance-covered remediation.

“I didn’t know what Category 3 meant when they explained it, but they were patient and walked me through exactly why everything had to go. They were professional, fast, and I never felt like they were trying to upsell me. USAA paid the whole thing.”

— D. Sorensen, Layton UT

Browse our case studies to see additional documented water, sewage, and mold jobs across the communities we serve.