How Do I Know If My Main Sewer Line Is Clogged?

You can tell your main sewer line is clogged, and not just one drain, when more than one fixture backs up at the same time, when using one fixture makes another gurgle or overflow, and when the lowest drain in the house, usually a shower or a floor drain, is the first to fill with dirty water. One slow sink is a branch line problem. Every drain acting up together is the main. This post is about recognizing that difference fast. For the bigger picture on Phoenix sewer issues, roots, and repair options, see our earlier post on sewer problems in Phoenix homes.

The Five Signs of a Main Sewer Line Clog

Three generations of our family have been pulling clogs in Phoenix, and these are the signs that tell us it is the main line before we even get out of the truck:

• Multiple drains backing up at once, especially on the ground floor.
• A toilet that gurgles or bubbles when the washing machine drains or the shower runs.
• Water coming up in the shower or tub when you flush the toilet.
• A sewage smell in the yard, near the cleanout, or from floor drains.
• A wet, spongy or unusually green patch of yard along the path from the house to the street.

If you have two or more of these, stop running water. Every gallon you send down is going to come back up somewhere.

Why Main Sewer Line Clogs Are So Common in Phoenix

Our hard water, at 16 to 20 grains per gallon, leaves scale inside older cast iron and clay sewer lines, which narrows the pipe and gives grease and paper something to grab. Tree roots chase the moisture in that pipe, and in the older central Phoenix neighborhoods with clay tile sewers the roots get in at every joint. Then monsoon season arrives. A heavy storm can overload the city sewer, push water back toward homes, and turn a partial clog into a full backup in a single afternoon. Homes built in the 1950s through 1970s, and homes with big trees between the house and the street, are the ones we see most.

What We Do When You Call

First we find your cleanout, the capped pipe usually near the foundation or in the front yard, and open it. If sewage is standing in the cleanout, the clog is between there and the street. If it is dry, the clog is inside the house. That one check tells us where to work.

Then we run a cable through the line to break up the blockage and get you draining. For grease and scale buildup, drain cleaning and clog removal with a hydro jet scours the pipe walls clean. Finally, we run a camera down the line. The camera is what separates a one-time clog from a cracked, bellied or root-filled pipe that is going to clog again next month. You see the footage with us, and you see the price before we lift a wrench.

A Main Line Call From Last Monsoon Season

A family in central Phoenix called our dispatcher on a Saturday evening in August. The hall bathroom shower had filled with gray water while nobody was using it, and the kitchen sink was gurgling. They had already poured two bottles of chemical drain cleaner down the shower, which did nothing except make the standing water unsafe to touch.

Our tech opened the cleanout and it was full. He cabled the line and pulled back a fistful of roots from the old clay pipe about 40 feet out, near a big mesquite. Camera showed the joint was offset where the root had entered. We got them draining that night through our emergency plumbing service, then came back the next week to do a spot repair on the bad joint so it would not keep happening.

The Honest Part: When Clearing Is Not Enough

Cabling a clog is the cheaper path, and for grease or a wad of wipes it is the whole fix. But if the camera shows a collapsed section, a belly where water pools, or roots at every joint, clearing it is just renting time. You will be calling again in a few months. In those cases we talk about sewer line repair and replacement, including trenchless options that avoid tearing up the yard. We show you the footage so the decision is yours, made on evidence, not on a salesman's word.

Call Phoenix Plumbing Co. for a Main Sewer Line Clog

If your drains are backing up together, that main sewer line is not going to fix itself. Phoenix Plumbing Co. is family owned since 2012, with a live Phoenix dispatcher, trucks stocked to finish most jobs on the first visit, upfront flat-rate pricing and a written workmanship warranty. Call 602-834-1208 and we will find the clog, show you the camera, and give you options.