Septic tank for a summer residence with a high level of groundwater

septic tank for a summer residence with a high level of groundwaterefbfbcefbfbc Blog

Many owners of country houses are faced with the problem of choosing and installing a septic tank. One important point influencing the choice of a septic tank, its model and method of installation, is the location of the site itself. In many regions of Russia, groundwater passes very low, which interferes with the installation of factory septic tanks and causes an increase in the cost of revision.

Septic tank for a house with a high groundwater level

In this article, we will talk about how to install a septic tank in areas with a high level of groundwater, show suitable models of septic tanks and point out the nuances.

If you decide to install a septic tank in your home, the first thing to do is check the groundwater level in your area.

What indicator should make you think about which septic tank to choose and the method of its installation? If the waters are located below 1.5 meters from the surface, then do not worry, and if higher, then this article is for you.

In some territories of Russia, this mark may be less than 30 cm. With such indicators, it becomes clear that it will be difficult, but possible, to install a septic tank in such a territory to the required depth.


It is recommended to use several methods, which will give a higher accuracy of determination. In autumn or spring, during rains or floods, it is best to check the water level in the soil. In most cases, exploration is carried out at the design stage for building a house, but this can also be done after the house is built. Several methods are known:

The easiest way is to look into the well, if there is one. The distance to the water from the ground is the required depth.


The next indicator: these are the plants on the site. If there are a lot of plants on the site, such as Labaznik, Kaluzhnitsa, Buzulnik, etc. – This is a sign that groundwater is close to the surface.


Another folk method that does not require additional costs is digging a small hole. If after a while it fills with water, then groundwater is close.

The ideal way is to drill two or three wells, at least 140-170 cm deep.

You can also ask your neighbors, they usually have already experienced this.

Neighbors in the country

Septic tank and its purpose

In short, a septic tank is an underground structure for the treatment and disposal of domestic wastewater from the sewerage of a country house or cottage. A septic tank is used in the absence of a central sewerage system. The septic tank consists of two main parts: a special receiving-overflow tank, divided into several compartments with bioenzymatic preparations (bacteria), and a drainage filter field of the soil natural and forced purification method.

The danger of improper installation of a septic tank

When installing a septic tank in an area with a high level of groundwater, there are two main dangers:

  1. If the structure is broken and ceases to be airtight, then the soil is polluted. This is very dangerous, as the filling of the septic tank will fall into the groundwater and can cause disease.
  2. The next danger is the emergence of a septic tank. The septic tank is made of lightweight, airtight materials such as: fiberglass, polyethylene, polypropylene. During spring floods, such structures can easily emerge. It is also possible to squeeze the septic tank out of the soil during its freezing.A septic tank has surfacedFloating septic tank

During the installation of a septic tank, it is recommended to strengthen it with a concrete foundation and slabs along the edges of the septic tank. The use of external backfilling with sand, with the addition of dry cement, has proven itself well. Next, the backfill must be tamped, thereby ensuring the reliability of the septic tank.

What is the best septic tank?

The main parameter when choosing a septic tank is its tightness. This design will help to avoid most of the problems associated with its operation.

When choosing a septic tank, an important factor is its cost. We do not recommend saving and installing concrete rings instead of a septic tank. Such a design cannot provide maximum tightness and guarantee that there will be no leakage of sewage into the ground or displacement of the rings, which will entail a large number of problems.


To install such equipment, an additional budget will be required to maximize the strengthening of the septic tank in the ground.

What material to choose for a septic tank?

The most common and at the same time the most unreliable material is concrete rings. It is extremely difficult to make a concrete wastewater tank airtight. Over time, such a design will leak and wastewater will still fall into groundwater, and this, as we know, is not safe for health and others.

Septic tank made of concrete rings
Septic tank made of concrete rings

The next material, which is also popular, but also not reliable, is brick. First, such a design will be expensive. Secondly, this structure has all the disadvantages of concrete rings.

Brick septic tank
Brick septic tank

There is another option to use old containers. Many summer residents use used barrels or tanks that are not intended for direct use. This design, as a rule, has a small volume and unreliable fastening in the ground.

boo barrel

The best and safest option is to use professional septic tanks. With proper installation, as a rule, these are free works when selling a factory septic tank, it will last a long time and will not bring additional worries in operation. When buying a septic tank, you can choose the required size, weight and volume. Septic tanks are also provided with high-quality sealed hatches and are made of materials with low thermal conductivity.

septic tank

Proper installation of a septic tank

When installing a septic tank in soil with a high level of groundwater, it is recommended to install a concrete foundation (pillow) at the bottom of the pit. You can also put a ready-made concrete slab, weighing more than 50% of the weight of the septic tank. If your septic tank weighs 200 kg, then the weight of the plate must be at least 100 kg. This will allow you to protect the septic tank from surfacing in the spring, during floods.

Steps to install a septic tank:

  • Dig a pit
  • Fill the bottom with sand and tamp
  • Installation of a concrete slab with fasteners (loops), or pouring the foundation
  • Immersion of the septic tank in the pit
  • Fixing the structure with hinges in the foundation
  • Sewer pipe connection
  • Checking the system with a control run of the sewer
  • Backfilling the pit with sand (sand filling).

Proper operation of the septic tank

So, the septic tank is installed and put into operation. In order for it to serve for a long time, it is necessary to take precautions during the operation of the sewer. There are a number of basic rules, subject to which the septic tank will serve you for a very long time.

Do not throw in the toilet
Basic rules for the safe use of sewers:
  • Do not flush large objects down the toilet
  • The septic tank and drain must be well insulated
  • Regularly pump out accumulated liquid


Choosing a septic tank for a site with a high level of groundwater
Septic Topas

The work of the Topas septic tank consists in biologically active cleaning and aeration process. Domestic wastewater undergoes oxidation and decomposition into components. The main working element of this installation is special bacteria that organically activate the decomposition process. Groundwater has virtually no effect on this septic tank.

Septic Topas

Topas septic tanks include two varieties: Cyclone and Astra. They are distinguished by the presence of various programs in the management module.

The Astra system has two options:

The level of filling is shown by the sensor in the form of a float

There is a gauge that shows the pressure.

The cyclone also has two types, which differ in the placement of the control unit. In the first version, it is located directly inside, and in the second, in a separate room maintaining the optimum temperature.

Unilos Mega

There is another model for small settlements called Unilos Mega, whose productivity is more than 30 cubic meters per day.

  • Perfectly cleans drains, so water can be diverted into a pond or ditch
  • Increased strength of materials for the manufacture of the system
  • Suitable for occasional use
  • Year-round operation regardless of temperature

Disadvantages of this septic tank:

  • The need for power
  • Pumping out sludge at regular intervals
  • Small assortment
  • High price
Septic Tank

A good decision regarding the price = quality ratio. However, the savings in this case is imaginary. Since the installation of additional equipment will be required, which will practically equalize the price with a similar model from the Topas series.

Septic Tank
  • No need for electricity
  • Ground resistant plastic housing
  • low price
  • Good range

To summarize: the decision when choosing a septic tank always remains with the owner of the house, the main thing is to take into account all the nuances of the site, the placement of the house, the high level of groundwater. The latter will not become a problem if you know where they pass and, based on this information, install a septic tank.

We wish you a pleasant stay in a comfortable home!

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