San Antonio, Texas
Why San Antonio drains clog the way they do
Edwards Aquifer water leaves mineral film inside pipes. That film grabs hair, soap, and cooking fat. Add the way many local houses were plumbed — long flat runs under a slab, then a tight turn to the stack — and a “slow bathroom” can become a floor-level backup after one shower.
Food culture does not help the kitchen line. Fajita grease, masa, and coffee grounds behave like wet concrete once they cool in a 2-inch branch. Chemical “openers” sit on top of that mass and etch the fixture finish more than they clear the stoppage.
Older galvanized in bungalows near downtown and clay laterals toward the missions corridor shrink the inner diameter year after year. A cable can punch a hole and leave a donut of grease that closes by dinner. That is the moment to talk about camera + jet, not a third bottle of lye.
What we clear, and what we will not pretend to clear
We clear lavatories, tubs, showers, kitchen sinks, laundry stands, and many floor drains. We will say no to a roof drain on a commercial building if it needs a different crew, and we will not promise to “fix the sewer” with a sink cable. If multiple fixtures are slow, the stoppage is likely on the sewer line, not in one trap.
A good drain visit starts at the fixture that failed first, then tests the others. If the tub gurgles when the toilet flushes, we stop treating it as a hair clog. If only the kitchen is dead and the dishwasher backfeeds, we pull the trap and look for a collapsed corrugated tailpiece before we feed a machine.
Rentals near the Pearl District and short-term houses around Alamo Plaza see weekend clogs because guests treat garbage disposals like trash cans. Tell us if the house is a rental so we can leave the line cleaner than a one-time punch-through.
- Stop using the disposal if it hums and the sink is standing full.
- Do not mix drain chemicals with a cable visit — the splash risk is real.
- If you already ran a store snake, say how far it traveled.
Methods: cable, camera, jet
A cable is the right first tool for a localized hair or paper clog. A camera is the right next tool when the clog returns in days or the cable chatters on a broken hub. Hydro jetting is the right tool when grease or scale coats the wall of the pipe. We explain which one we are using and why, because the price and the mess are different.
On slab homes, cleanouts may be in a closet, a flower bed, or missing entirely. Missing cleanouts are common. We will not smash a finished floor to invent one during a simple clog unless sewage is already in the house and there is no other access.
For commercial kitchens, grease interceptors and night dumps change the plan. Light commercial work is on the table; a full interceptor pump-out may need a separate hauler. We will not invent a grease-trap license on this page.
Prevention that actually fits this climate
Cold-water “grease down the sink with Dawn” is folklore. Scrape pans. Catch hair. Run hot water after soap, not as a substitute for a trap that is already half full of paste. Once a year, a preventive cable or jet on a problem kitchen is cheaper than a Saturday flood during Fiesta traffic.
If your street has large oaks or pecans, roots belong in the sewer conversation, not the bathroom sink conversation. See the sewer line page if yard cleanouts burp or the toilet has a wet ring after rain.
A San Antonio drain visit without the folklore
Boiling water on a PVC trap is how people warp a joint and then blame the plumber. Store gels sit on a grease plug and make the next cable splash. Baking soda theater is harmless and also not a method. We would rather you stop using the fixture and take a photo of the standing water than start a chemistry project.
If only the dishwasher backfeeds, we look at the air gap and the knockout on the disposal before we declare a main-line event. If the washing machine empties onto a laundry floor, we look at the standpipe height and the trap before we sell a sewer replacement. Small, local failures still happen in a city famous for slabs.
Write the first fixture that failed, how many days it has been slow, and whether a floor drain moved. That is enough to decide between a sink cable, a cleanout machine, or a camera. For official water and storm notices that might explain a neighborhood of backups, use sanantonio.gov.