Causes of Common Septic System Problems

Septic system issues often arise from a combination of poor maintenance, improper use, or natural wear and tear. Understanding the root causes of these problems can help homeowners take preventative steps to keep their system running smoothly.

Septic Inspections1. Clogs

Clogs are one of the most common issues faced by septic systems. These occur when solid waste or non-biodegradable materials build up in the pipes or tank, obstructing the flow of wastewater. Common causes of clogs include:

  • Flushing inappropriate items: Items like paper towels, feminine hygiene products, wipes, and diapers should never be flushed down the toilet. Even products labeled “flushable” can cause problems for septic systems.
  • Excessive use of water: Septic systems are designed to handle a certain volume of water. Overloading the system with too much water in a short period of time can cause clogs. This can happen from running multiple appliances simultaneously or taking long showers while doing laundry.
  • Grease and fats: Pouring grease or fats down the kitchen sink can lead to buildup in the pipes and cause clogs.

How to fix clogs:

  • Drain snake or auger: For minor clogs in the pipes leading to the septic tank, a drain snake or auger can help break up the blockage.
  • Septic-safe drain cleaner: If using chemicals, ensure they are septic-safe to avoid damaging the bacterial balance in the tank.
  • Professional pumping: If the clog is severe and inside the septic tank itself, the system may need to be pumped by a professional.

2. Leaks

Leaks in a septic system can occur in various areas, such as the tank, pipes, or drain field. Leaks are often difficult to detect until they lead to more significant problems like standing water or foul odors.

  • Cracked pipes or tanks: Over time, pipes and the septic tank itself can develop cracks due to shifting ground, tree root intrusion, or corrosion.
  • Improper installation: Septic systems that were not installed correctly may have pipes or tanks that are improperly sealed, leading to leaks.
  • Tree roots: Tree roots can grow into the septic system’s pipes or even the tank itself, causing damage and creating leaks.

How to fix leaks:

  • Pipe repair or replacement: Small leaks in pipes may be fixable with minor repairs or patching. In more severe cases, sections of the pipe may need to be replaced.
  • Tank repair: Cracks in the septic tank can sometimes be sealed, but in other cases, the tank may need to be replaced.
  • Root removal: If tree roots have infiltrated the system, the roots need to be removed and any damaged pipes or tanks should be repaired or replaced.

3. Overflowing Septic Tank

Septic tanks can overflow if they aren’t pumped regularly or if the drain field is malfunctioning. An overflowing tank can lead to sewage backups in the house or wastewater pooling in the yard.

  • Lack of pumping: Septic tanks must be pumped every 3-5 years to remove accumulated sludge. If the tank becomes too full, it will overflow.
  • Drain field failure: The drain field is responsible for filtering liquid waste from the septic system. If it becomes clogged or compacted, it can no longer absorb and treat wastewater, causing it to back up into the septic tank.

How to fix an overflowing septic tank:

  • Pump the tank: Regular pumping by a professional is the best way to prevent an overflow. If you notice signs of an overflowing tank, schedule a pump immediately.
  • Drain field repair: If the drain field is clogged or compacted, it may need to be repaired or replaced by a professional. This is a more significant issue and should be addressed immediately to prevent environmental contamination.

How to Prevent Septic System Failure

Prevention is the key to avoiding costly septic system repairs or replacements. With proper care and regular maintenance, most septic system problems can be avoided. Here are some steps you can take to keep your septic system in good working order.

1. Regular Pumping and Inspection

As mentioned, septic tanks should be pumped every 3-5 years, depending on the size of your tank and household water usage. Regular pumping prevents sludge buildup, which can clog pipes and cause the tank to overflow.

In addition to pumping, have your system inspected by a professional at least once a year. Inspections can catch small problems before they become major issues, like leaks or signs of drain field failure.

2. Be Mindful of What You Flush

One of the simplest ways to prevent septic system problems is to be careful about what goes down your drains. Only flush toilet paper and human waste. Avoid flushing items like wipes, sanitary products, paper towels, and diapers. These materials can cause blockages and lead to septic tank clogs.

In the kitchen, avoid pouring grease, fats, and oils down the drain, as these can solidify and block pipes. Compost food waste instead of using a garbage disposal, which can overwhelm your system with solids.

3. Monitor Water Usage

Overloading your septic system with water can cause it to fail. Spread out water usage by staggering laundry loads and limiting long showers. Use water-efficient fixtures and appliances to reduce the volume of water entering your system.

Fix leaky faucets and running toilets immediately, as even small leaks can overwhelm your septic tank over time.

4. Maintain the Drain Field

The drain field is a critical component of your septic system, responsible for filtering liquid waste. To maintain a healthy drain field:

  • Don’t park or drive on the drain field: Heavy vehicles can compact the soil, reducing its ability to absorb water.
  • Avoid planting trees near the drain field: Tree roots can infiltrate pipes and cause blockages or leaks.
  • Divert water away from the drain field: Ensure that stormwater, roof runoff, and irrigation systems are directed away from the drain field to prevent over-saturation.

When to Call a Professional for Septic Repair

While some septic system issues can be managed by homeowners, many problems require the expertise of a professional. If you encounter any of the following issues, it’s time to call a septic specialist.

1. Frequent Backups and Slow Drains

If you notice frequent backups or slow drains throughout your home, it could indicate a problem with your septic system. These symptoms may point to a full septic tank, clogged pipes, or a failing drain field. A professional can assess the situation and recommend the appropriate solution.

2. Foul Odors in Your Yard or Home

Foul smells coming from your drains or your yard near the septic tank or drain field are a sign of a serious problem. It could mean there’s a leak in the system or that the tank is overflowing. Call a septic professional immediately if you notice strong, persistent odors.

3. Standing Water in Your Yard

If you see standing water or wet spots in your yard, particularly near the septic tank or drain field, it’s a sign that your septic system is no longer able to handle wastewater. This could indicate a clogged or failing drain field, and it’s essential to have the system inspected right away to prevent further damage.

4. Unexplained Increase in Water Bills

If you notice an increase in your water bills that isn’t related to your water usage, it could be a sign of a leak in your septic system. Leaks can cause the system to malfunction and should be addressed by a professional.

5. Contaminated Well Water

If your home uses a well for drinking water, have the water tested regularly. If tests show high levels of nitrates, bacteria, or other contaminants, it could indicate that your septic system is leaking and contaminating the groundwater. This is a serious issue that requires immediate attention from a septic professional.


Septic systems are an essential part of many homes, but they require regular maintenance and care to function properly. Common septic problems, such as clogs, leaks, and overflows, can be avoided with proper use and routine servicing. Knowing the signs of septic system failure, such as frequent backups, foul odors, and standing water, can help you address issues early before they escalate.

While some minor septic problems can be handled by homeowners, many require the expertise of a professional. Regular pumping, inspections, and being mindful of what goes down your drains will help ensure the longevity of your septic system and prevent costly repairs. If you suspect a problem with your septic system, don’t hesitate to call a professional to assess and fix the issue before it becomes a bigger, more expensive problem.

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