A failing septic system doesn’t always give you obvious warning signs. Sometimes, you’ll notice the slow drains or sewage smells around your property. Other times, the first indication of a problem comes when a professional pumps your tank and discovers cracks, damaged components, or signs of deterioration.
Knowing what to watch for can help you catch problems early, potentially saving you from expensive repairs or a complete septic system replacement. This is especially important for older systems that have been in service for 30 to 50 years or longer.
Ace Septic & Excavation provides septic inspections, repairs, and installations throughout Weld County, Larimer County, Boulder County, Jefferson County, and throughout Northern Colorado. Here are some of the warning signs we come across that homeowners should know—and what to do if they notice them.
1. Slow Drains in Multiple Fixtures Throughout the House
One slow sink could be a localized clog, but multiple slow draining fixtures (tubs, sinks, toilets) can point to a septic issue.
If you notice slow draining fixtures across your home, your septic system may be struggling to accept or move wastewater. A full tank, clogged effluent filter, blocked outlet pipe, or saturated leach field can all be the cause of that restricted wastewater flow. When wastewater can’t leave the tank or leach field fast enough, that’s when you’ll see it back up into the plumbing, affecting multiple drains.
2. Gurgling Sounds in the Plumbing
Gurgling from toilets, sinks, or drains can indicate that air is being displaced as wastewater struggles to move through your plumbing.
An overloaded system, clogged effluent filter, or blocked septic outlet can interfere with normal wastewater flow, causing air to move through the pipes, which creates that bubbling or gurgling sound you may be hearing.
If this symptom happens alongside symptom #1 or symptom #4 below, have your septic system inspected!
3. Sewage Backing into the Lowest Drains (Floor Drains or Basement)
Sewage backing up into floor drains, showers, or your basement can be an indicator that your system is failing and your wastewater has nowhere to go.
In a failing septic system, the tank may be too full, an outlet or filter may be blocked, or the leach field may no longer absorb wastewater effectively. Then, as wastewater accumulates, it backs up through your plumbing—appearing first at the lowest drains in the house.
A sewage backup requires a quick response. Stop using as much water as possible, avoid contact with the sewage, and call a septic professional to identify the cause.
4. Sewage Smells Inside the House or Outside Near the System
Persistent sewage smells can indicate that wastewater gases are escaping where they shouldn’t.
A damaged tank, leaking pipe, faulty connection, or failing leach field can all allow wastewater to escape into the surrounding soil. If the leach field is overloaded or saturated, inadequately treated wastewater will rise to the surface and produce those odors you’re noticing.
Look especially for smells near the septic tank or leach field, especially alongside wet ground. These will warrant an inspection.
5. Soggy Ground or Standing Water Over the Leach Field—Especially When It Hasn’t Rained
Your leach field is designed to distribute wastewater into the soil, where it receives further treatment. If the soil can’t absorb the wastewater quickly enough, excess liquid can collect underground and eventually rise to the surface.
This happens when the leach field is overloaded, distribution pipes are damaged or blocked, or solids from a failing tank have entered and clogged the field.
Standing water, or persistently soggy ground above the leach field, particularly during dry weather, is a warning sign. Reduce your water use and schedule an inspection.
6. Noticeably Greener or Faster Growing Grass Over the Leach Field
In a similar way, if the grass over your leach field is noticeably greener or grows faster than the surrounding lawn, wastewater may be supplying it with extra moisture and nutrients.
A failing or overloaded leach field allows wastewater to accumulate closer to the soil surface. The moisture and nutrients in that wastewater can stimulate grass growth, even when the rest of the yard is relatively dry.
When coupled with sewage odors and soggy ground/standing water, this symptom can point to a failure in your leach field’s ability to treat and disperse wastewater properly.
7. High-Water Alarm Going Off
If your septic system uses a pump, your high-water alarm can warn you that wastewater has risen above its normal operating level.
This may happen when a septic system is failing to move wastewater to the leach field fast enough. If the pump fails, wastewater continues accumulating instead of being discharged. A failing or overloaded leach field can also prevent wastewater from draining away at the expected rate, causing the water level in the system to rise.
When the alarm goes off, reduce your water use and contact a septic professional. If the problem continues for too long, wastewater can back up into your house or overflow your system.
8. Algae Blooms or High Nitrate/Bacteria in Nearby Pond, Stream, or Well
A failing septic system can release inadequately treated wastewater into the surrounding soil, allowing contaminants to reach nearby groundwater, wells, ponds, or streams.
When a tank leaks or a leach field can no longer properly treat wastewater, bacteria and nitrates can move through the soil and contaminate groundwater. Excess nutrients entering nearby ponds and streams can contribute to algae blooms.
These signs can indicate that the septic system is no longer containing and treating wastewater properly. If you notice unusual algae growth near your property or receive water test results showing elevated nitrate or bacteria levels, have your septic system inspected and address potential contamination promptly.
Septic Tank Problems That May Not Show Warning Signs
Not every septic system problem causes slow drains, smells, or wet spots in the yard. Some of the most crucial issues develop inside the tank and remain hidden until the tank is pumped or inspected.
Pumping provides an opportunity for a professional to examine the tank’s interior and identify damage that may otherwise go unnoticed!
During pumping, a septic professional may find:
- Cracks in the walls, lid, or floor of your septic tank that can compromise it and allow wastewater to escape or allow groundwater to enter.
- Damaged baffles or tees that can allow solids to move into the leach field and contribute to premature failure.
- Deteriorating concrete or rusted steel that compromise the tank’s integrity.
- Tree roots entering the tank that damage it and create pathways for leaks.
- Unusually low liquid levels, which can indicate a leak.
- A damaged or clogged effluent filter that restricts water flow and contributes to backups if it’s not addressed.
This is a big reason why regular septic system pumping matters. Not only does it remove the accumulated solids, but it’s a chance for a professional to catch a tank problem before it turns into sewage in the yard or a ruined leach field.
If your septic tank has failed but the leach field and other system components are still in good condition, replacing the tank alone may be possible. Reach out to us for an inspection.
What Actually Causes a Septic System to Fail + Prevention Tips
Some septic system problems develop because of age and “normal” deterioration. Others result from lack of maintenance or everyday household habits. Some causes include:
Not Pumping the Tank Enough
Septic tanks need periodic pumping to remove accumulated solids. If the solids build up too much, they move into the leach field and clog the soil or distribution components. Your pumping schedule isn’t one size fits all either—depending on your tank size, household size, and water usage.
Excessive Water Use
Your septic is designed to handle a certain volume of wastewater. Sending too much water into the system in a short period can overload the tank and leach field. Repair your leaking fixtures. Spread out your laundry schedule. Direct sump pump discharge and water softener discharge strategically.
Flushing Items That Don’t Break Down
Septic systems rely on natural processes to separate solids and treat wastewater. Items that don’t break down will accumulate, clog components, and interfere with treatment. Avoid flushing wipes (even labeled as flushable), feminine products, grease, harsh chemicals, and medications.
Driving or Building Over the Septic System
Vehicles and heavy equipment can compact the soil or damage your buried septic components. Building structures over the tank or leach field also restricts access for maintenance and repairs. Keep vehicles and permanent structures off of your septic system.
Tree and Shrub Roots
Roots naturally seek moisture, and can enter septic pipes or tanks through existing cracks and joints. Over time, root intrusion will restrict wastewater flow and cause damage. Keep trees and large shrubs at a suitable distance from your septic components.
Age and Deterioration
Even a well-maintained septic system eventually wears out. Concrete deteriorates, steel corrodes, pipes and fittings break down, and leach fields can lose their ability to absorb wastewater. Older systems (30 to 50+ years old) need special attention as their components reach end of life.
How Long Does a Septic System Last?
Most septic systems can last around 40 years, although that lifespan varies considerably depending on the system’s design, water usage, and maintenance history.
As an estimation,
- 50 years or older: Some well-maintained systems remain in service this long, but older tanks may have deteriorating concrete, corroded components, or other age-related problems.
- Around 40 years: Most well-maintained systems approach this age with only certain components that may need repair or replacement.
- 20 to 30 years: Irregular pumping and maintenance can shorten a septic system’s lifespan by up to 20 years.
If your septic system is 30 to 50 years old or older, pay close attention to changes in performance and keep up with routine inspections and pumping. Identifying a deteriorating tank early may allow you to replace that component without replacing the entire system.
What Should You Do if Your Septic System Shows Signs of Failure?
If you suspect a problem, acting early can help limit damage and narrow down your repair options.
- Reduce water use immediately. Avoid unnecessary laundry, long showers, and other high-water activities. This is extra important if sewage is backing up or wastewater is surfacing in the yard.
- Don’t ignore it or wait. Small problems like a clogged filter or broken baffle are much cheaper to fix early than a full leach field replacement.
- Contact a licensed septic professional. A septic professional like Ace Septic & Excavation can figure out whether it’s a maintenance fix, a repair, or time for replacement. We offer free estimates, a two-year warranty, and we handle all the county permitting. Schedule an Inspection.
Need Septic System Repairs or Replacement in Northern Colorado?
If you’ve noticed these signs, don’t wait for the problem to get worse and potentially more expensive.
Ace Septic & Excavation provides septic inspections, repairs, tank replacements, and complete system installations throughout Weld County, Northern Colorado, and the Front Range foothills. We can evaluate your system, identify the likely cause of the problem, and help determine whether a repair can buy you more time or if a replacement is needed.
Call Ace Septic & Excavation at (970) 342-0214 or email sales@aceexcavationco.com to discuss your septic system concerns.