Raw sewage rising through lowest fixtures is the worst sewage event a home can experience. Houston's combined sewer/storm system makes this common during heavy rain. Full PPE, IICRC S500 Cat 3 protocols, city subrogation documentation for municipal-cause backups.
Houston combined system overflow
Older Houston cracked clay laterals
Kitchen/lateral line accumulation
City-side equipment failure
Downstairs toilet/tub/shower
Garage, basement, utility room
Diagnostic for main line
Documentation for city claim
1950s-era combined storm/sewer system overwhelmed by modern rainfall.
~45% of callsLive oak / pecan roots crack older clay laterals, slow accumulation.
~25% of callsKitchen grease, flushed wipes, debris block laterals.
~20% of callsCity lift station failure, lateral collapse on city side.
~10% of callsDispatcher screens for active flowing sewage, advises evacuation of affected rooms, dispatches Cat 3 crew.
Cat 3 protocols, full Tyvek PPE, OSHA BBP. Confirm plumber has been called for source-side.
Truck-mount biohazard-rated extraction starts. Affected area mapped. Photos for both your carrier AND potential city subrogation.
Carpet, pad, baseboards, lower drywall, contaminated furnishings bagged for biohazard disposal.
Two-pass EPA-registered disinfectant application. Air scrubbing continues. Affected HVAC ducts cleaned.
Air movers + dehumidifiers. ATP testing confirms decon. Subrogation package compiled.
Major rain events guarantee main line backups across Houston. Bayou-adjacent neighborhoods, older laterals, and combined-system zones face repeat exposure.
Sewer/drain backup is typically NOT covered under standard Texas HO-3 â it requires a separate Backup of Sewer & Drain endorsement (sometimes called water/sewer backup coverage, $25K-$50K limits typical). Check your declarations page.
If the cause is a documented municipal failure (capacity overflow, lift station failure, lateral collapse on city side), Texas governmental immunity makes claims difficult but not impossible. We provide the documentation needed for subrogation.
We know each major Texas carrier's playbook for this loss type
Most projects bill direct to insurance. Out-of-pocket cost is typically your deductible only.
Free on-site Cat 3 contamination assessment. Coverage review included.
We bill carrier under your Backup of Sewer/Drain endorsement. Full Cat 3 scope covered.
Out-of-pocket main line backup cleanup ranges by water height and affected area.
"City sewer backed up during a storm and we had raw sewage in our downstairs bathroom and hallway. They had the containment up in 90 minutes, the demo done in two days, and the documentation supported a city subrogation claim that recovered our deductible."
"Slow lateral collapse over years finally caused a full backup. Plumber repaired the lateral; they handled the Cat 3 sanitization. Backup of Sewer endorsement we'd added 6 months earlier paid the full $14,000 scope."
"Half the neighborhood lost lift station service. Sewage backed into 11 homes. They coordinated mass response. Class-action subrogation against the city succeeded based partly on their documentation timeline."
Only if you have the Backup of Sewer & Drain endorsement specifically. Many policies don't include it by default â it's a separate $50-$200/year endorsement. Check your declarations page.
Texas governmental immunity (Texas Tort Claims Act) makes municipal claims difficult. Documented capacity failures, lateral collapses on the city side, or maintenance neglect have been successful with proper documentation.
Toilet overflow is usually contained to one fixture. Main line backup affects multiple drains simultaneously and brings much larger volumes of contaminated water.
No. Proper Cat 3 cleanup includes source materials removal AND odor treatment. Ozone or hydroxyl treatment after demo eliminates residual odor at the molecular level.
Cat 3 protocols take 7-14 days typically: source-side fix, PPE crew extraction, demo, disinfection, drying, ATP testing, reconstruction.
Rental property: landlord's master policy usually covers structural cleanup. Renter's HO-4 covers your contents and Alternative Living Expenses (ALE) if displaced.
Raw sewage Cat 3 cleanup, biohazard protocols, full PPE, EPA disinfectants, city subrogation documentation.