7 Warning Signs Your Sewer Line Is Failing
Your sewer line does its job out of sight and, ideally, out of mind. But when it starts to fail, it almost always gives warnings first—and homeowners who catch them early can often fix the problem for a fraction of what a full sewage backup or collapsed line costs.
O’Brien Plumbing has been diagnosing and repairing sewer lines in the San Bernardino Mountains for over 25 years, from Crestline and Lake Gregory to Lake Arrowhead and Green Valley Lake. These are the seven warning signs we tell every customer to watch for.
1. Multiple Slow Drains at Once
A single slow sink usually means a local clog in that fixture’s drain. But when your kitchen sink, shower, and toilets are all sluggish at the same time, the blockage is almost certainly downstream in the main sewer line, where everything comes together.
2. Gurgling Sounds From Toilets and Drains
Gurgling is trapped air escaping past a partial blockage. If your toilet bubbles when the washing machine drains, or you hear glugging in the tub after you flush, your sewer line is struggling to move water and air the way it should.
3. Sewage Odors In or Around the House
A healthy sewer system is sealed—you should never smell it. Sewer gas in the bathroom, basement, or crawl space, or a sulfur smell in the yard, means wastewater or gas is escaping somewhere it shouldn’t. In mountain homes with crawl spaces, this is often the first sign a homeowner notices.
4. Recurring Clogs That Keep Coming Back
If you’re reaching for the plunger every few weeks, or you’ve had the line snaked more than once in a year, something structural is going on—typically tree root intrusion, a sag in the line, or a partial collapse. Clearing the clog treats the symptom; a camera inspection finds the cause.
5. Soggy Spots or Extra-Green Grass in the Yard
A cracked or separated sewer lateral leaks wastewater into the surrounding soil. Look for patches of ground that stay wet without rain, sunken areas along the path between your house and the street, or a strip of grass that’s mysteriously greener than the rest of the yard.
6. Foundation Cracks or Sinkholes Near the Line
Long-term leaks wash away the soil supporting your foundation, walkways, and driveway. On sloped mountain lots in places like Twin Peaks and Valley of Enchantment, soil erosion from a leaking sewer line can become a serious structural issue, not just a plumbing one.
7. Pests and Rodents You Can’t Explain
Rats and insects can enter a home through surprisingly small breaks in a sewer line. If pest problems have appeared alongside any of the signs above, the sewer line deserves a look.
What to Do if You’re Seeing These Signs
Don’t guess—look. A video camera inspection shows exactly what’s happening inside your line: roots, cracks, sags, or buildup. From there, the fix might be as simple as sewer and drain cleaning, or as targeted as trenchless pipe lining to repair damaged sections without excavation.
Whether you’re in Crestline, Lake Arrowhead, Running Springs, or down the hill in San Bernardino or Highland, O’Brien Plumbing is available 24/7. Call (909) 337-3743 or schedule an appointment online before a warning sign becomes a backup.
Frequently Asked Questions About Failing Sewer Lines
It depends on the material. Clay and cast iron lines—common in older mountain cabins—typically last 50 to 60 years, while modern ABS and PVC lines can last much longer. Many homes in the Lake Arrowhead and Crestline area are reaching the age where original lines wear out.
A full blockage or sewage backup is—raw sewage in the home is a health hazard and needs immediate attention. Early warning signs like slow drains and gurgling aren’t emergencies yet, which is exactly why it pays to address them promptly.
Standard policies often exclude sewer lines unless you carry a service line endorsement. Check your policy—and either way, a camera inspection report from a licensed plumber is valuable documentation for any claim.