If you own one of the classic pre-war homes lining the streets near Somerville’s historic downtown or the tree-shaded blocks of Raritan Borough along the river, there’s a good chance your sewer lateral is older than you are. Many homes in this part of Somerset County were built between the 1900s and 1950s, when clay and cast-iron pipe were the standard. Decades later, those same pipes are often the reason for the mysterious slow drains, gurgling toilets, and soggy patches of lawn that homeowners in Somerville and Raritan call us about every week.
Below are nine warning signs that your sewer line may be failing, plus what to do about it before a slow drain turns into a backed-up basement.
A single slow sink is usually a local clog. But when your kitchen sink, bathtub, and toilet are all draining sluggishly at the same time, the problem is likely downstream in the main sewer line, not in any one fixture. This is one of the most common calls we get from homeowners near Somerville’s Division Street and Raritan’s Anderson Street corridor, where original clay laterals are still in service.
Air trapped by a partial blockage has to go somewhere, and it often escapes as a gurgle when you run water elsewhere in the house. If your toilet burps back at you every time you run the washing machine, that’s your sewer line asking for a camera inspection.
A cracked or offset sewer line lets gas escape into the soil and into your basement through foundation cracks. In older Raritan homes near the Raritan River, where soil stays damp much of the year, this smell is often the first sign homeowners notice.
It sounds counterintuitive, but a suspiciously green strip of grass — especially one that follows the path from your house to the street — can mean your sewer line is leaking nutrient-rich wastewater into the soil. This is a classic sign in older Somerville lots with mature landscaping.
When a sewer line fails underground, the surrounding soil can shift or wash away, taking some of your foundation’s support with it. New or worsening cracks near where the sewer line enters the home warrant a closer look.
Somerville and Raritan are known for their mature street trees, which is part of their charm — and part of the challenge for underground pipes. Roots seek out the moisture and nutrients inside sewer lines, especially at pipe joints, and can eventually choke off flow entirely. We cover this in more detail in our post on tree roots and sewer lines.
A void forms underground when wastewater escapes a broken pipe and erodes the surrounding soil. Eventually the ground above it can sink or feel spongy underfoot.
If you’re plunging the same toilet every month or snaking the kitchen line every quarter, the recurring nature of the problem points to a structural issue in the line itself rather than a one-time clog.
In homes with basements, the floor drain is typically the lowest point in the plumbing system. When the main sewer line is blocked, that’s usually where wastewater backs up first — often the clearest sign that professional attention is needed immediately.
Because so many homes in this part of Somerset County still have their original clay or cast-iron laterals, we always recommend starting with a sewer line camera inspection rather than guessing at the problem. A waterproof camera lets our team see exactly where a crack, offset, or root intrusion is located without tearing up your yard or basement floor.
From there, many blockages can be cleared with hydro jetting, a high-pressure water method that scours the inside of the pipe clean without the need for digging. If the inspection reveals a structural problem like a collapsed section or significant root intrusion, our team will walk you through sewer line repair options, including trenchless methods that minimize disruption to your landscaping.
Somerville and Raritan’s older housing stock is part of what makes these neighborhoods special, but it also means underground infrastructure deserves a little extra attention. If you’re noticing any of the signs above, don’t wait for a full backup. Check out our FAQ page for more on what to expect from an inspection, or schedule an appointment with TruFlow today. You can also browse more local tips on our blog.
TruFlow proudly serves Somerville, Raritan Borough, and the surrounding Somerset County communities. Call (908) 530-9516 or visit truflownj.com to schedule your sewer line inspection.
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