What are the common causes of a sewer line backup?

The most common causes of a sewer line backup are tree roots, hardened grease, and years of debris buildup in aging pipes. Roots slip into tiny cracks and expand, while cooled kitchen grease coats the pipe interior until the passage narrows and flow stalls; older lines in cold climates can also crack from freeze–thaw cycles, and a failing sewage ejector pump can back wastewater up from lower levels. We see these issues often around Hopedale and in other New England homes with older piping.

Watch for these early warning signs:

• Multiple slow drains across the home
• Foul sewer odors indoors or near the yard
• Actual wastewater backing up at a low drain If sewage is present, treat it as urgent and avoid using fixtures until the line is cleared and, if needed, camera-inspected.

Updated: 2026-05-14

Need help in Hopedale, MA? Call (508) 571-6488 or book online. “Although it was a difficult blockage, they were able to clear the line and all is well.” — Steve N.