How To Tell if Your Septic Tank is Full

STERLING SEPTIC & PLUMBING LLC STERLING SEPTIC & PLUMBING LLC • August 7, 2025
Technician inspecting outdoor septic tank for signs of being full — Sterling Septic & Plumbing

How do you know when your septic tank is full? The easiest way to know if your septic tank is over capacity is to invest in a professional septic inspection. Septic inspections and other septic services from Sterling Septic & Plumbing ensure your system stays healthy. Contact us today to avoid the frustration and potential health dangers of backups from a full septic tank. 

Monitoring Your Septic Tank is Essential

Having your septic tank regularly monitored and pumped is the best way to take a proactive approach to septic maintenance. Inspections reveal existing and potential problems that could lead to clogs, backups, and further damage. Once your septic tank has been checked, your technician will recommend any repairs or replacements needed. Here's why monitoring your system and having your septic tank pumped often enough is essential.


  • Prevents Backups
    Monitoring a septic system helps identify and correct problems that could lead to sewage backups on your property. 
  • Maintains Efficiency
    Keeping an eye on water levels and sludge accumulation ensures your septic system is working at optimal levels.
  • Prevents Contamination
    Having your septic tank inspected periodically reduces the risk of wastewater contaminating the surrounding groundwater.
  • Increases Longevity
    Regular tank pumping and monitoring services can help extend the lifespan of your septic tank and system.
  • Catches Problems Early
    Professional septic inspection services can identify signs of a full septic tank before there is further damage or overflowing.


When you compare the cost to empty a septic tank to the cost to install a new tank, drain field, or main line, the math is easy. And, yes, your technician will be happy to tell you how often to empty your septic tank!


How to Tell If Your Septic Tank is Full

Part of learning how to tell if a septic tank is full is knowing the basics of how a septic tank works. The solids enter the tank and build up inside the tank while the liquids pass through to the drain field. If the tank accumulates too much waste, it can damage the drain field, create clogs, and cause backups. If you have a full septic tank, you'll likely encounter issues like these:


  • Slow Drains
    If your drains are draining more slowly than usual, it often means the septic tank is full or there are clogs in the septic lines.
  • Gurgling Pipes
    Clogs, line damage, and a backed-up septic system can cause gurgling sounds from indoor pipes. 
  • Sewage Backups
    Sewage backup in your drains is an undeniable sign you have a septic issue, like a full tank or significant obstruction. 
  • Foul Odors
    Unpleasant odors around your home or near the septic system are one of the most common signs of a full septic tank.
  • Pooling Water
    An overflowing septic tank usually causes water to pool around the septic tank or drain field. 


Understanding the signs of a full septic tank helps property owners avoid potentially expensive repairs and replacements. 

What to Do if You Suspect You Have a Full Septic Tank

If you experience any of the signs of a full septic tank, your first step is to call Sterling Septic & Plumbing for a septic inspection. A professional inspection helps determine if your septic tank is full and if the issue is due to lack of maintenance, damage, or other factors. Here are other steps you can take to minimize the impact of an overflow:


  • Stop Using Water
    Stop using appliances like toilets, washers, and showers that create wastewater to help take the strain off your septic system.
  • Stay Away From the Drainfield
    When a septic tank overflows, it's critical to avoid the drain field area to prevent making the problem worse. 
  • Decontaminate Your Property
    Clean any sewage backup on your property to minimize health hazards. Wear protective gear and use hot water and a cleaning solution to clean up the mess, then disinfect the area. 

Why Choose Sterling Septic & Plumbing 

Choosing the best septic and plumbing service in Pierce and King Counties is simple when you partner with Sterling Septic & Plumbing. Our family-owned business has built a reputation for exceptional service, quality results, and hometown customer care. Here are a few reasons to consider us.   


  • Stellar online reviews
  • Better Business Bureau A+ rating
  • All required insurance and licenses
  • Years of proven field experience
  • Expert septic and plumbing services
  • Competitive rates and flexible options
  • Reliability and timeliness


Whether you need septic repairs or a home sale septic inspection, you'll discover that fast response times and clear communication are standard features. If your inspector determines your tank is full, you can relax. Our septic pumping services in Washington will have you fixed with an empty septic tank in no time.

Frequently Asked Questions

  • How often should my septic tank be pumped?

    A typical septic tank should be inspected every 1 to 3 years and pumped at least every 5 years. The ideal frequency for your septic tank depends on the tank size, water use, and other factors. If you don't know the size of your tank or how often to empty your septic tank, a septic inspector is an excellent resource.

  • Do you offer emergency septic services?

    A full septic tank can quickly create all sorts of issues both outside and inside your home or business. Some of those issues, like sewage backup, can damage your property and health and require immediate attention. When you team up with Sterling Septic & Plumbing, you'll get the on-demand services you need at no extra cost.  

  • How long does it take to pump a septic tank?

    An average septic tank can be pumped in as little as 30 minutes, while a larger tank can take up to an hour or more. How long it takes to pump your septic tank also depends on the tank's accessibility and the equipment used.

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