What Is Black Water and How to Clean it Up

The toilet makes an unnerving gurgling sound, or a huge rainstorm brings flood water into your basement. Water damage is never something a homeowner wants to deal with, but contaminated or “black water” can turn ordinary water damage into a nightmare.  

What is black water, and, more importantly, will your home ever be the same after it pays you a visit? The good news is that you can get through this. However, black water carries real health risks, which is why cleanup is always a job for professionals.  

Key Takeaways

• Black water is contaminated water carrying bacteria, viruses, or chemicals that can make you sick. 
• Common sources include sewer backups, flooding, and toilet overflows. 
• Contact with black water can lead to skin infections, stomach illnesses, and other health problems. 
• Black water cleanup is never a DIY job. You need to bring in trained water damage restoration professionals with the right gear and equipment. 
• Mold can start growing in as little as 24 to 72 hours, so always act fast if you have black water in your home.  

What Is Black Water?

Black water is contaminated water that can carry pathogens, toxins, or other nasty stuff that can make you or your family sick. Think sewage, floodwater, or anything that’s come into contact with waste.  

The name is a little misleading, though. Black water isn’t always black. It can be murky, brown, or even clear. It’s not about the color that defines black water but what’s actually in it.  

The restoration industry uses a standard called the IICRC S500 to organize water into three water damage categories: 

• Category 1: Clean water. Water in this category comes from a sanitary source, like a faucet or supply line, and poses low health risks. 
• Category 2: Gray water. This water has some contamination. It can come from appliances, like a leaking washing machine or a broken dishwasher.  
• Category 3: Black water. This is the most serious category. Black water is highly contaminated and can cause health problems if you touch it, breathe it in, or swallow it. 

Unfortunately, black water is the most difficult and dangerous type of water damage to deal with, but that doesn’t mean your home is a lost cause.  

Common Sources of Black Water

Where does black water come from? By knowing the source of water damage in your home, you can figure out if you’re dealing with black water in the first place.  

Sewage Backups 

The toilet is the unsung hero of the home, moving waste away from your residence. However, even heroes can let you down. When your toilet or plumbing system gets clogged, wastewater can overflow into your bathroom. This water carries human waste, bacteria, and other pathogens, which makes it one of the most dangerous sources of black water. 

Floodwater and Storm Runoff

During a storm, hurricane, or flash flood, water can enter your home. Unfortunately, even relatively clean rainwater can pick up contaminants along the way, such as human and livestock waste, hazardous chemical waste, and other contaminants.  

Other Contaminated Water Sources

Black water can come from broken sump pumps—or from rivers, streams, and the ocean. Even clean water can grow bacteria and turn into black water if it sits around too long. If you’re unsure if water damage in your home is unsafe, treat it like black water until a professional water remediation specialist tells you otherwise.  

Why Is Black Water Dangerous?

Now that you know what black water is, you know it’s certainly not something to take lightly. According to the CDC, floodwater and sewage-contaminated water can carry harmful bacteria, viruses, and parasites, along with chemical waste and other contaminants that can lead to illness.  

Exposure to black water can cause: 

• Infections (especially if you have open wounds) 
• Skin rashes 
• Stomach illnesses 
• Tetanus 

The risks to your home from black water are just as serious. Black water can soak into carpet, drywall, and insulation. If that happens, you’ll need to throw out those materials and replace them entirely. Left untreated, anything soaked in black water can also invite mold growth within 24 to 72 hours. 

How to Handle Black Water Cleanup

If black water shows up in your home, don’t panic. What you do in the next few minutes will make a big difference in the outcome. A little caution now can prevent bigger problems and keep your family safe while you wait for a professional remediation team to arrive.  

1. Keep everyone away: The first and most important thing to do is to keep family members away from any area touched by black water. That includes your furry family members as well.  
2. Do not touch black water with your bare skin: Avoid walking through the water or wet areas if you can help it. 
3. Shut off power and water: If it’s safe, shut off the electricity to that part of the home at the breaker box. Stop using appliances that need water, like sinks or washing machines, until you’ve fixed the source of the black water leak. Don’t run your HVAC system, either. It can pull in airborne contaminants and spread them to other parts of your home. 
4. Don’t try to clean it up: As tempting as it might be to try and clean up the mess yourself, don’t. Even if you mean well, you could end up tracking contamination throughout your home, including to areas that were previously clean.  

Black water cleanup isn’t a job for household cleaners or a wet/dry vacuum. Instead, call restoration professionals. They have the training, protective gear, and equipment to remove the water and disinfect your home safely.  

What Does Professional Black Water Cleanup Involve?

Professional black water cleanup is a careful process designed to protect both your home and your health. Technicians will put on personal protective equipment, including gloves, boots, and respirators, before they set foot into the affected space. 

The first step will be containment. Technicians will seal off the affected area to stop the contamination from spreading. From there, they’ll use industrial extraction equipment to remove standing water. They’ll also remove and throw away anything that can’t be saved, like soaked carpets and drywall. 

Next, they’ll apply an antimicrobial treatment to kill bacteria and prevent mold from growing. Once that’s complete, they’ll use industrial drying equipment to evaporate the last of the moisture in the area. To wrap up the process, your water damage restoration team will perform final safety testing to make sure your home is clean and safe again.  

How to Prevent Black Water Incidents

You can’t control every storm or sewer issue, but you can take a few proactive steps to lower your risk of a black water nightmare in your home.  

• Schedule regular sewer line inspections, especially in older homes 
• Install a backwater valve to keep sewage from flowing back into your home 
• Keep gutters and downspouts clear so water drains away from your foundation 
• Avoid flushing grease, wipes, or other items that can clog your toilet 
• Test your sump pump before storm season hits 
• Take a look at our detailed water damage resources for more tips and tricks. 

Call SERVPRO for Black Water Cleanup

Now that you know what black water is, you also know that when it strikes, you’ve got both a health emergency and home emergency on your hands. When that happens, it’s time to call SERVPRO. Our crews respond 24/7 with the training, equipment, and protective protocols to handle Category 3 water safely. We can also help you navigate the insurance claims process.  

Find your local SERVPRO and get help fast.   

FAQs

Why Is My Water Black?

Water usually turns black due to contamination from sewage, floodwater, or waste. This contamination often comes from a sewer backup, storm runoff, or a plumbing failure that’s carried bacteria and debris into your home. The color signals a serious health risk, not just a stain.  

Can You Clean Up Black Water Yourself?

No. Black water cleanup is never a DIY project. This type of water can contain bacteria, viruses, and other pathogens that pose serious health risks to you and your family members. Professional restoration technicians have the training, protective gear, and equipment to clean and disinfect your home safely.  

What Is the Difference Between Black Water and Gray Water?

Gray water comes from sources like washing machines or dishwashers and carries moderate contamination. The definition of black water makes it far more dangerous. It’s sewage or flood water and can contain pathogens. While you need to handle gray water carefully, you should always call a professional to deal with black water.   

How Long Does Black Water Cleanup Take?

The cleanup time for black water depends on the extent of the damage, but most jobs take several days to complete. The process includes water extraction, removal of contaminated materials, disinfection, and structural drying.