When the main sewer line clogs, everything will eventually force its way back up through the drains and into your house. In other words, it’s a recipe for a very messy and expensive disaster.

Be prepared to handle potentially serious clogs by looking out for these three signs of possible sewer line trouble:

1. Multiple drain issues

If your main line clogs, it affects all the connected drains in your sinks, showers, baths and toilets. When the water reaches a blockage, it has nowhere to go but back up. Therefore, you will notice that multiple drains and plumbing fixtures clog or back up at the same time. You may also hear loud gurgling sounds coming from the drains, which is caused by wastewater hitting air pockets as it pushes its way through the clog.

2. Strong sewer smell

If the less-than-ideal smell of sewer begins to waft into your home from the drains, it’s likely a telltale sign of a clogged line. It’s quite a strong and unpleasant scent, so this sign of sewer trouble is unmistakable.

3. Water overflows

Look out for unusual activity coming from your plumbing fixtures. If there’s water or sewage coming up through the bathtub, shower drain or toilet, your main sewer line is likely clogged. Overflowing water tends to go to the lowest points in the home first, so watch for plumbing fixtures in those areas to show initial signs.

When you’re unsure about the issues, you can try a few tricks to double check for overflowing water. In the bathroom, flush the toilet. If water immediately comes up through the bathtub or shower drain, you probably have an overflow issue. You can also run the water in the sink and watch to see if the water rises in the toilet. Another test is to run your washing machine and check the bathtub or shower drain for signs of water coming up.

What should you do if you think your sewer line is clogged?

If you notice these signs, don’t flush the toilet or run any water. Shut off the main water supply valve immediately, which should be in the garage or near your water heater. Turning off the water will prevent excess sewage from flooding the system until a professional can check out the problem. You can’t do much to clear the sewer line without expert help, so make an appointment with a professional plumber as soon as possible.

It’s always important that you spot plumbing problems early to minimize damage and expense.

Not sure if it’s a city sewer line backup? Check with neighbors – if they are experiencing the same issues then it’s likely a city sewer line. Remember that the city will only fix their line, and not the homeowner’s line.

Be prepared for potential issues with plans from Sewer Line Warranties of America as having plans can help you pay for covered water, sewer and other service line repairs.