Understanding Septic Tanks: Your Frequently Asked Questions Answered
- Mark Preston
- Dec 18, 2025
- 4 min read
Updated: Feb 19
Septic tank frequently asked questions are abundant because many people think a septic tank is a mysterious black box sitting underground, taking care of business. It's something thought about with relatively low frequency, except for those who've already had the misfortune of septic backup, the associated costly repairs, and the unforgettable stench!
A well-treated and functioning septic tank is the unsung hero. However, when left untreated, sooner or later, you'll experience a true nemesis requiring gargantuan efforts to defeat. If you are new to septic tanks or have never bothered to give it a thought, you may have some pressing questions needing answers. Here’s a summary of frequently asked septic questions and simple answers aimed at making your incursion into septic systems as easy as possible.
How Often Should You Pump a Septic Tank?
There's no standard answer; it varies based on the size of the tank, the household size, the type of waste thrown into it, and the preventive maintenance it receives. However, on average, a septic tank should be emptied every four years.
Signs Your Septic Tank is Full
The telltale signs that a septic tank is reaching full capacity are pretty consistent and easy to spot or smell:
Nauseating Odor: This is generally the first warning sign that something is wrong with your piping or septic tank. Clogged pipes can impede waste from reaching the septic tank, causing it to decompose closer to the drains and releasing unpleasant odors into your household. Alternatively, if your septic tank has been overloaded, it will release those familiar odors back into your home.
Slow Drains: Drains should let liquids down at the same speed they come in. If you experience slow drainage or a slow flushing toilet, it may be due to a clogged pipe. If a septic-friendly drain cleaner doesn't solve the issue, you might be facing a full septic system.
Sewer Backup: This sign usually follows untreated slow drains. Liquids start pooling at your home's lowest drains and eventually move to the higher drains.
Lawn Patches: The grass covering your septic system should look no different than the rest of your lawn. If the grass around that area is suspiciously healthier and the soil feels moister, trust your instincts and call specialists, as your septic tank may be full or leaking.
Pooling Water or Sludge: Once the septic tank is full, its contents will find a way out. Initially, cleaner water will exit into your lawn, but as the problem remains untreated, waste will clog your pipes, leading to decomposing waste polluting your lawn and household.
Does Shower Water Go Into the Septic Tank?
Yes, all water from the household, through the plumbing system powered by gravity, eventually finds its way into the septic tank.
How Does a Two-Tank Septic System Work?
The first tank filters out solids, which eventually decompose, while sewage makes its way into the smaller second tank for further treatment.
Consequences of Not Pumping Your Septic Tank
Septic tanks need to be emptied on average every four years, though the timing may vary. If a septic tank goes unemptied for too long, solids will start creeping into the pipe leading to the drain field, causing septic backup.
Can Too Much Rain Cause Septic Problems?
Yes, heavy rainfall can flood the ground around the drain field, reducing the speed at which water flows out of your septic system.
How Long Does It Take for Toilet Paper to Decompose in a Septic Tank?
Toilet paper usually breaks down quickly in water, with the process beginning within approximately 12 seconds. The decomposition process is further expedited with septic tank treatments containing chemical or live solutions.
What Should You NOT Put in a Septic Tank?
The list can be endless. Most septic systems are designed to cope with common household waste such as organic waste, oil, and soap. Avoid putting in elements such as (but not limited to): plastics, cigarettes, tampons, diapers, condoms, or any other non-biodegradable product.
What is the Best Septic Tank Treatment?
In our opinion, FLUSHTIME is the best septic tank treatment on the market. Watch this market benchmark video and judge for yourself: FLUSHTIME.
What Size Septic Tank Do I Need for My Home?
The size depends on the number of bedrooms and daily water usage. Most homes need between 1,000 and 2,000 gallons, but always check local regulations and site conditions.
Are Plastic Septic Tanks a Good Long-Term Solution?
They can be if installed correctly in stable soil. While they have a shorter lifespan than concrete, their ease of installation and corrosion resistance make them ideal for certain locations.
Do Weather or Climate Affect Septic Tank Performance?
Yes. Cold climates may favor plastic or prefabricated tanks that resist cracking, while hot climates can affect concrete tanks. High water tables require systems with secure anchoring.
Understanding the Impact of COVID-19 on Septic Tanks
Ever wonder how the COVID-19 pandemic affects septic tanks? Find out here!
We hope you found this post useful and that your questions were answered. If not, feel free to reach out at info@flushtime.co, and we'll do our best to answer your septic questions.
About FLUSHTIME
FLUSHTIME is a Nano-Tech based septic tank treatment capable of dealing with clogged pipes, backed-up septic systems, and the resulting bad odors. Over 50 billion natural beneficial bacteria are packed into a single capsule. When deployed into the septic system, they rapidly multiply by digesting fats, grease, oils, organic matter, and toilet paper, restoring your septic field to optimal condition.
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