Sewage is backing up into your home. This is not the time to Google solutions, compare prices, or wonder if it will fix itself. This is an emergency that requires immediate, specific action to protect your health, your family, and your property. Follow these six steps in order.
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Stop all water flow in the house immediately. Every drop of water that goes down a drain adds to the sewage that is backing up into your home. Locate your water main shut-off valve (usually near the water meter at the front of the house or in the basement/crawlspace) and turn it off completely. Do not flush toilets, run faucets, or use any water-using appliances. If you cannot locate the main shut-off, turn off individual supply valves at each fixture.
Raw sewage is a biohazard. It contains bacteria, viruses, parasites, and chemical contaminants that can cause serious illness. Keep children and pets completely away from the affected area. If you must enter the area, wear rubber boots, rubber gloves, eye protection, and an N95 mask at minimum. Do not eat, drink, or smoke in or near the affected area. Do not touch your face until you have washed thoroughly.
Open windows for ventilation if possible, but do not turn on HVAC systems that could spread contaminated air to other parts of the house. If sewage has contacted electrical outlets, appliances, or wiring, do not touch them—turn off the circuit breaker for the affected area from your electrical panel.
Before any cleanup begins, document everything for your insurance claim. Take photos and video of: the extent of sewage in the home (floors, walls, fixtures), the water level or sewage marks on walls, all personal property that has been damaged or contaminated, the exterior of the home near cleanouts showing any overflow, and any standing water or sewage in the yard. Date-stamp your photos and save them in multiple locations. This documentation is critical for your insurance claim and can mean the difference between a full payout and a denied claim.
Call a licensed plumber who offers 24/7 emergency sewer service. Describe the situation clearly: sewage is backing up, you have turned off the water, and you need emergency response. Most Boise plumbing companies with emergency capability can have a crew on site within 45 minutes to 2 hours. They will diagnose the blockage (usually with a camera), clear it, and restore flow. Get a verbal estimate before authorizing work, and ask for a written invoice when the job is complete.
Once the plumber has restored flow and confirmed the line is clear, cleanup must begin promptly. Standing sewage becomes more hazardous the longer it sits. For small-scale backups confined to a single drain or floor area, you may be able to handle cleanup yourself with proper protective equipment. Remove standing water with a wet-vac (not a regular vacuum), dispose of all contaminated porous materials (carpet, padding, cardboard, drywall that has absorbed sewage), and disinfect all hard surfaces with a bleach solution (one cup of bleach per gallon of water).
For large-scale backups affecting multiple rooms or any backup that involved more than a few inches of standing sewage, hire a professional biohazard remediation company. These specialists have commercial-grade equipment for water extraction, drying, disinfection, and mold prevention. The cost is significant ($2,000 to $10,000 or more depending on scope), but it is typically covered by homeowners insurance if you have proper documentation. Do not attempt to save and reuse sewage-contaminated soft furnishings, mattresses, or upholstered furniture—the health risk is not worth the savings.
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Get the Free Checklist →If your plumber determines that the blockage is in the city sewer main rather than your lateral, or if sewage is backing up from manholes or other city infrastructure, call the City of Boise Public Works emergency line at (208) 608-7200. The city is responsible for maintaining the sewer main and will dispatch a crew to address main-line blockages, breaks, and overflows. This call can also be appropriate if you suspect a problem at the connection point between your lateral and the city main.
Reporting the incident to the city is also important for documentation purposes, even if the problem turns out to be entirely on your side. City records can support your insurance claim and establish a timeline that demonstrates you acted promptly.
Yes. Raw sewage contains harmful bacteria, viruses, and parasites. Avoid direct contact, keep children and pets away, and wear protective equipment if you must enter the affected area.
Coverage varies by policy. Standard policies may cover sudden backup damage but not the sewer line repair itself. A service line endorsement and water backup endorsement significantly improve coverage. Document everything before cleanup.
A minor backup affecting a single fixture may be cleaned in a day. A major backup involving multiple rooms can require 3 to 7 days for professional water extraction, drying, disinfection, and restoration.
Call a plumber first to diagnose and clear the blockage. If the plumber determines the problem is in the city main, call the City of Boise at (208) 608-7200. If sewage is backing up from manholes or street-level infrastructure, call the city immediately.
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