Sewer backups in Indianapolis come down to six causes: tree roots in the lateral, grease buildup, wipes and non-flushable items, a cracked or sagging old lateral, heavy rain hitting a combined sewer, and sump pumps or downspouts illegally tied into the sanitary line. Roots and grease account for most of the calls we run.

The bad news is that the pipe from your house to the city main belongs to you, not Citizens Energy Group. The good news is that most backups give you weeks of warning before sewage hits the floor, and a camera inspection tells you exactly which of the six you are dealing with.

Key Takeaways

• The sewer lateral between your house and the city main is the homeowner’s responsibility to repair, not the utility’s
• Tree roots and grease cause the majority of residential backups, and both are recurring problems, not one time events
• The EPA estimates 23,000 to 75,000 sanitary sewer overflows happen across the country every year
• A backwater valve is the single best protection for a finished basement in an older Indianapolis neighborhood
• Gurgling toilets and multiple slow drains at once mean the main line, not a single fixture

What Are the Warning Signs of a Sewer Backup?

A single slow drain is a fixture problem. Several slow drains at once is a main line problem, and that is the one worth acting on fast.

The pattern matters more than the severity. Backups build gradually, so the early signs show up months before anything overflows.

Watch for these:

• Gurgling from the toilet when you run the washing machine or a sink
• Water rising in a shower or floor drain when a toilet is flushed
• Sewage smell in the basement, especially near a floor drain
• Slow drainage in the lowest fixtures in the house first
• A patch of lawn over the sewer line that is greener or soggier than the rest

If you already have sewage on the floor, stop running water in the house and call for emergency plumbing service. Every flush and every load of laundry adds to what comes back up.

Common Causes of Sewer Backup

Cause 1: Tree Roots in the Sewer Lateral

Roots are the most common cause we find on older Southside properties. They are drawn to the moisture and warmth escaping from a cracked joint, then grow into the pipe and keep growing.

Once inside, the root mass catches grease, paper, and debris until the line is effectively plugged. The EPA lists root intrusion among the leading causes of sanitary sewer overflows nationally.

Why This Hits Older Neighborhoods Hardest

Clay tile laterals installed before the 1980s have joints every few feet. Every one of those joints is a potential entry point.

Homes in Beech Grove, Southport, and the older parts of Franklin Township frequently still have the original line. Mature trees plus jointed clay pipe is the exact combination roots exploit.

How to Fix It

1. Get a camera inspection to confirm roots and locate the entry point
2. Have the line mechanically cleared to restore flow
3. Decide between a maintenance schedule or a permanent repair
4. Replace or line the damaged section if roots keep returning

Cutting roots buys you time, usually 12 to 24 months. It does not fix the crack that let them in, which is why the same line backs up again on the same schedule.

Cause 2: Grease Down the Kitchen Drain

Cooking grease goes down warm and liquid, then cools and hardens on the pipe wall. Each time it happens the passage narrows a little more.

Garbage disposals make it worse, not better. Ground food solids stick to grease that is already coating the pipe.

What actually causes grease blockages:

• Bacon fat, pan drippings, and fryer oil poured down the sink
• Butter, salad dressing, and dairy rinsed off plates
• Meat scraps sent through the disposal
• Running hot water after, which only moves the grease further down the line before it hardens

The fix is habit, not equipment. Pour cooled grease into a can and bin it, wipe greasy pans with a paper towel before washing, and keep meat scraps out of the disposal.

Cause 3: Wipes and Other Things That Do Not Break Down

Wipes labeled flushable clear the toilet, which is all that word promises. They do not break apart in water the way toilet paper does, so they snag on any rough spot in the line.

Once a wipe catches on a root or a grease ring, it becomes the anchor for everything that follows. We have pulled masses out of Southside laterals that were mostly wipes bound together with grease.

Never flush these, regardless of packaging:

• Flushable or baby wipes
• Paper towels and tissues
• Feminine hygiene products
• Dental floss and cotton swabs
• Cat litter, even the flushable kind
• Medications

Toilet paper and human waste. That is the whole list of what belongs in a toilet.

Cause 4: An Old Clay or Cast Iron Lateral That Has Cracked or Sagged

Pipe material tells you a lot about your risk. Clay tile cracks and lets roots in. Cast iron corrodes from the inside until the pipe wall goes rough and scaly, which catches debris.

Both can also develop a belly, a low spot where the ground has settled underneath. Waste pools in the sag instead of flowing through, and solids build up in that pocket until the line plugs.

Pipe Material	Typical Era	Main Failure Mode
Clay tile	Pre-1980s	Cracked joints, root intrusion
Cast iron	1930s to 1970s	Internal corrosion, scaling
Orangeburg	1940s to 1970s	Collapse and deformation
Modern PVC	1980s onward	Bellies from soil settling

A camera inspection is the only way to know which you have and what condition it is in. If the line is failing along its length rather than at one spot, replacement or lining is the honest answer, and it is the same conversation we have with homeowners who need whole house repiping on the supply side.

Cause 5: Heavy Rain and Indianapolis Combined Sewers

Older parts of Indianapolis run on combined sewers, which carry stormwater and sewage in the same pipe. When rain overwhelms the system, the pressure has to go somewhere, and basements are the low point.

Citizens Energy Group’s DigIndy tunnel system, a 28 mile network built 250 feet below the city, was designed to capture the overflow that used to reach local waterways. It handles the main line problem.

What DigIndy Did Not Fix

The tunnel system does not touch your lateral. That pipe running from your foundation to the city main is still original in a lot of older homes, and it is still yours to maintain.

So a heavy rain can still push water back through a degraded lateral even in neighborhoods where the main line issue is now solved.

Your protection in a combined sewer area:

• Install a backwater valve on the lowest drain line
• Keep the lateral clear so it can handle peak flow
• Make sure floor drains are not blocked by storage or shelving
• Know where your cleanout is before you need it

Cause 6: Sump Pumps and Downspouts Tied Into the Sanitary Sewer

This one is common in older homes and it is illegal in most jurisdictions. A sump pump or downspout plumbed into the sanitary sewer dumps hundreds of gallons of clean stormwater into a pipe sized for household waste.

During a storm that extra volume overloads your own lateral and the neighborhood main at the same moment. It also drags silt and leaf debris into a line that was never meant to carry it.

How to check and correct it:

• Trace where your sump discharge line actually goes
• Confirm downspouts run to the yard or a storm drain, not into a pipe entering the foundation
• Reroute any sanitary connections to daylight or a storm system
• Add a battery backup so the pump keeps working when the power drops during the same storm

One Beech Grove homeowner with a finished basement had us out for a routine inspection, and the 11 year old sump pump was running but cycling oddly. We replaced it and added a battery backup before spring. The basement stayed dry through the wettest stretch of the year, including a power outage that would have flooded the space. Correct sump pump installation and correct discharge routing are two halves of the same job.

What Should You Do the Moment Sewage Backs Up?

Stop using water immediately. Every fixture you run adds volume to a line that already cannot drain.

Keep people and pets out of the affected area. Raw sewage carries bacteria and viruses, and the EPA notes that exposure can cause illness ranging from stomach upset to far more serious infections.

In order:

1. Shut off water use throughout the house
2. Cut power to the affected area at the breaker if water is near outlets or appliances
3. Call a licensed plumber to locate the blockage
4. Call Citizens Energy Group if neighbors are backing up too, which points at the main rather than your lateral
5. Photograph everything before cleanup for your insurance claim

Standard homeowners policies often exclude sewer backup damage. It is usually an inexpensive rider, and worth adding before you need it rather than after.

How Do You Prevent It From Happening Again?

Prevention on a sewer line is mostly about knowing its condition. A camera inspection every few years costs a fraction of a single backup cleanup.

If you have a finished basement in an older neighborhood, a backwater valve is the strongest single protection available. It lets waste out and stops it coming back in.

A realistic maintenance rhythm:

• Camera inspection every three to five years, sooner on a clay lateral with big trees
• Root treatment or clearing on schedule if roots are confirmed
• Grease and wipes kept out of the drains, permanently
• Backwater valve installed if the basement is finished or the neighborhood floods
• A plumbing inspection before you buy any home built before 1980

Get Your Sewer Line Checked Before the Next Heavy Rain

Most sewer backups are predictable. Roots, grease, and an aging lateral all announce themselves through gurgling drains and slow fixtures long before anything reaches the floor.

If your drains have been slow, if a toilet gurgles when the washer runs, or if you have already had one backup and nobody told you why, get a camera in the line. Knowing whether you are looking at a clearing, a spot repair, or a full replacement is worth more than any guess.

Call Parkhurst Family Plumbing at (317) 517-9348. We serve Franklin Township, Southport, Beech Grove, and homeowners searching for a plumber in Greenwood. Larry will show you what the camera sees and price the honest option before any work starts.