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Subtitle

SEPTIC TANKS  WATER TREATMENT SYSTEMS

HOW SEPTIC TANKS WORK:

  1. All water runs out of your house from one main drainage pipe into a septic tank.
  • The septic tank is a buried, water-tight container usually made of concrete, fiberglass, or polyethylene. Its job is to hold the wastewater long enough to allow solids to settle down to the bottom forming sludge, while the oil and grease floats to the top as scum.
  • Compartments and a T-shaped outlet prevent the sludge and scum from leaving the tank and traveling into the drainfield area.
  1. The liquid wastewater (effluent) then exits the tank into the drainfield.
  • The drainfield is a shallow, covered, excavation made in unsaturated soil. Pretreated wastewater is discharged through piping onto porous surfaces that allow wastewater to filter though the soil. The soil accepts, treats, and disperses wastewater as it percolates through the soil, ultimately discharging to groundwater.
  • If the drainfield is overloaded with too much liquid, it can flood, causing sewage to flow to the ground surface or create backups in toilets and sinks.
  1. Finally, the wastewater percolates into the soil, naturally removing harmful coliform bacteria, viruses and nutrients. Coliform bacteria is a group of bacteria predominantly inhabiting the intestines of humans or other warm-blooded animals. It is an indicator of human fecal contamination.

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How much will a Septic Tank cost?

Click 'Get A Quote' and we'll tell you

VIDEO: Watch this video for a quick rundown on the workings of a standard septic tank system

A septic tank, or sewage treatment plant, is installed for any property where there is no access to a main sewer system. The septic system is a critical part of your infrastructure, it is essential that it is built & installed correctly to ensure trouble free long-term use and operation.


1. Septic System Design

With any project, it is always important to have a basic design to work from. This means when you start work on site you have a clear plan of action. A septic system comprises two main elements. The tank and the percolation area or discharge area.

2. Choosing the right septic tank

Choosing the right septic tank or sewage treatment plant is a crucial step in the process. At this stage, you will already have decided whether you will be installing a soak-a-way or percolation area, or having a direct discharge.

3. Installation

When installing your septic tank, or wastewater treatment system, there are two options. The first is to complete the full or part installation works yourself. If you are any way unsure about doing a septic tank upgrade or new system installation yourself, then you should talk to us.

4. Ventilation

Good ventilation is often something that is overlooked when installing a septic tank, or sewage treatment plant. Bad ventilation can lead to odour issues onsite. It is very important that the ends of percolation trenches are vented, and there is either a vent on the wastewater treatment plant or that there is a soil vent stack at the house.

5. Maintenance & Operation Access

When installing your sewage treatment plant, consideration should be given to future maintenance. Any lids on the tank should not be covered over with soil. Access will be needed in the future for septic tank emptying and for inspection and checks that the system is running properly. 
The tank should be within 30m of a roadway, as septic tank emptying trucks generally only have 30m long hoses for emptying tanks. If a tank is over 30m from a driveway your septic tank emptying costs may increase.

How much does a Septic Tank System Installation cost?

It’s a common question…


…and it’s not an easy question to answer. It depends on a number of variables specific to each property/project and customer needs.  One size does not fit all.


The variables can include: The size of the property? The type & size of septic tank?  The location and type of leach field, the ground conditions at your property etc etc.


Here is an example to give you an idea of cost.  This example is based on:


  • 2 bedroom property - 4 person usage
  • Basic septic tank & filtration system
  • Standard leach field design/lay-out
  • Supplied & Fitted within 7 days

Septic Tank Systems from just 2,995.00лв + VAT


Full Project: We take care of everything from start to finish. Including supplying the septic tank, machinery, labour and materials required to complete a full system installation.   To date (September 2021) we have installed over 250 systems!

NOTE: Septic tank installations must be registered under Environmental Protection Regulations.  We take care of this for you too.  We provide you with all the required registration  documentation confirming your installation complies with all the current regulations.  Unregistered septic systems are illegal and carry substantial fines.

HOW TO: Know if your Septic System is failing

Many buildings and homes have on-site wastewater management systems, commonly called septic systems. Because septic systems are buried, it is easy to forget about them as they quietly, elegantly and efficiently maintain human and environmental health. Septic systems are the norm in rural areas, but they can be quite common in urban areas as well. It is important to know if your building is on a septic system.

These are signs of a failing system:


  • Sinks and toilets drain slowly
  • Backed-up plumbing
  • Gurgling sounds coming from the plumbing
  • Sewage odors in the house or yard
  • Wet or mushy soil in the yard
  • Standing water that is greyish in color
  • Grass growing faster and greener in one particular area of the yard
  • Bacteria in well water

The laws, regulations and legislation relating to the treatment of raw sewage in Bulgaria will be changing soon.  These changes will impact every household not currently served by a mains sewage system.


If you currently dispose of your raw sewage and waste water via either a cesspit or any other system that does not treat sewage - you will be effected by the new regulations .


Don't worry!  We'll have you covered.  Watch this space for details of the upcoming launch of www.septictanks.bg installed by diggers4hire.com

HOW TO: Calculate the size of Septic Tank you need

The most important calculation you need to know is the size of septic tank you need specific to your expected household water usage.


  •  This video example is based on a 2 bedroom property
  • 5 person usage of the system
  • Average water usage per person, per day

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