What you're probably seeing right now
Water coming up through the floor drain in your basement, or bubbling out of the shower drain downstairs, usually shows up first after you run the washing machine or flush an upstairs toilet. Sometimes it's just a damp ring around the drain. Sometimes it's an inch of standing water with toilet paper in it. Either way, the timing matters. If the backup happens right after you use water elsewhere in the house, that's not a fixture problem. That's the main line telling you it can't move water out fast enough, or at all.
Why Springfield basements see this so often
A lot of the housing stock in Springfield and the surrounding Ozarks dates from the 1950s through the 1970s, and plenty of it still runs on clay or cast iron sewer laterals. Clay pipe cracks over decades, and tree roots from mature oaks and maples, common in neighborhoods like Rountree or around Phelps Grove, find those cracks and grow straight into them. Cast iron rusts from the inside and narrows like a clogged artery. Either way, you end up with a pipe that's handled forty or fifty years of flow and is finally losing the fight.
The region's clay-heavy soil adds its own pressure. It swells when wet and shrinks when dry, and Springfield gets both extremes: heavy spring rains in April and May, then dry stretches in late summer. That constant soil movement shifts pipes, opens joints, and stresses old repairs. A line that was fine for years can start failing the same season the ground finally moves the wrong way.
More on this from What A Backup In The Basement Is Telling You About The Main Line.
What a homeowner can actually check
Start simple. If only one drain is backing up, like just the basement shower, that's likely a local clog you can often clear yourself with a plunger or a hand auger. If multiple fixtures back up together, especially the lowest drain in the house, that points to the main line itself.
Go outside and check the cleanout, usually a capped pipe sticking up near the foundation or along the side yard. If you're comfortable, remove the cap slowly, since pressure can push water out. If water is already up near that cap or it starts seeping when you open it, that confirms a mainline blockage rather than a fixture issue.
Also think about recent weather. A backup that started during or right after a heavy rain suggests the line may be cracked and taking in groundwater or tree roots are pulling toward moisture. A backup that happens regardless of rain points more toward a straightforward clog or collapse.
Where this stops being a DIY job
A basic hand auger can clear a simple hair or grease clog a few feet into the line. It can't deal with a root mass, a bellied section of pipe, or a collapsed joint, and forcing it can make things worse by punching a hole in already weak pipe. If sewage is backing up through multiple drains, if the cleanout shows standing water, or if this has happened more than once in the past year, that's past the point of a bucket and a store-bought snake.
This is also where timing turns into an emergency rather than an inconvenience. A slow backup on a Tuesday afternoon is one thing. A full backup at 9pm with a house full of people and a toilet that won't stop filling is another. Raw sewage backing up into a basement isn't just unpleasant, it's a health hazard, and it can sit there soaking into drywall and subfloor the longer it's ignored overnight.
What to do while you wait for help
Stop using water in the house. No laundry, no dishwasher, no extra flushes. Every bit of water you send down the drain has nowhere to go but back up. If the backup is already in the basement, keep people and pets away from the area and don't try to mop it up with anything you plan to reuse, since contaminated water needs to be treated as such.
If you know where your main shutoff or sewer line cleanout is, having that information ready saves time once a plumber arrives, since camera inspection of the line is usually the next step to find out whether this is a clog, a root problem, or a section of pipe that needs to be replaced.