Site drainage

Land drainage and sewer connection

Proper disposal of dirt and rainwater is a matter of course for many. However, responsibility is not limited to public wastewater disposal. Every single landowner is required here.

The wastewater of a building is fed via the so-called land drainage system (GEA) to the public sewer. The property owner is responsible for the construction and maintenance of this facility. The accumulating rainwater is to be seeped into the new development - as far as technically possible - on the property.

Info for builders and planners

The planning and production of the drainage system must be carried out in accordance with the currently valid EN and DIN standards as well as the generally recognized state-of-the-art rules.

A land drainage system consists of the underground pipes, inspection shafts and the sewer pipes. Work on these lines may only be carried out and checked by specialist companies. The "transfer" of the wastewater is usually at the property boundary.

Builders and planners get under information builders  additional suggestions and useful tips for the planning and production of the property connection and the land drainage system. This should help you to avoid any errors and later annoyance during operation by the landowner or at the acceptance by the public utilities.

Proof of freedom from defects
Please remember at an early stage that you promptly inform the public utilities for the final acceptance with the implementation of a water level test when rebuilding, expanding or reconstructing the site drainage system to check the tightness of the buried sewage pipes for rain, dirt and mixed sewers. As a rule, existing systems must be checked every 25 years.

The legal basis for the construction, operation and maintenance of the land drainage system is the Drainage Ordinance (EWS) of the City of Landshut. As property owner you are obliged to comply with the drainage statute.

Planung Entwässerungsanlage

Checking the canal house connection

The network of public canals in the city of Landshut must be regularly maintained and repaired in the event of damage like any other building. The municipal utilities regularly check the main and connecting canals in the public road area to see if they are tight.

Property owners must also have their own drainage pipes in the ground regularly checked for damage, for example via a camera inspection. Irrespective of the stipulated deadlines in the drainage statute of the city of Landshut, you should ensure in your own interest the lasting functioning of your drainage system. As with the car or the heater, it usually only gets really expensive if damage is detected too late or an emergency situation has occurred.

And: Functional lines serve both environmental and water protection as well as the value preservation of your property.

" Continue reading

In the ongoing monitoring of older property drainage systems, the property owner has to inspect the equipment to be maintained by him at intervals of 25 years from commissioning at his own expense by a technically suitable entrepreneur and to have the result confirmed by him. The landowner has to submit the confirmation to the city or the municipal utilities on request. According to § 23 EWS, a transitional period until 31.12.2022 applies.

At the latest, if Stadtwerke Landshut checks the public sewer main lines and property connections as part of the self-monitoring, you must expect that the Stadtwerke demand proof of the absence of defects in your property drainage system.

Our tip: Ask Stadtwerke Landshut if the municipal sewers in the connection area will be checked in the near future or if sewer or road construction measures are planned. You may receive a favorable offer for your own commission from the companies commissioned by Stadtwerke, which are already working on site anyway. You will find more tips in our guide to checking the canal house connection.

Öffentliche Kanäle

Frequently Asked Questions (FAQ) & Info

What belongs to the land drainage system and who is responsible for it?

Land drainage systems are structures in buildings and on land used to collect and treat soil and rainwater as needed. These include the sewers in the building and the so-called underground pipes, which are laid in the ground or under the house. Also inspection shafts as well as plants like backflow closures and waste water lifting plants belong to it. The property owner is responsible for the construction, operation, maintenance, repair and maintenance of the property drainage system on his private property up to the property boundary. The sewer network operator (Stadtwerke Landshut) is responsible for the connecting lines and collecting ducts on public roads.

Why does the property drainage system have to be tight?

Leaky pipes, which are above the groundwater level, lead to soil and groundwater contamination due to escaping sewage. In leaking pipes, which are below the groundwater level, groundwater penetrates into the sewers as so-called "extraneous water" and has the consequence that the sewers are polluted or overloaded by larger amounts of sewage, rainwater overflows more quickly, the sewage treatment works with lower efficiency and higher operating costs attack. Damage in pipes can also lead to flooding of cellars due to blockage.

How can I prove the absence of defects in the site drainage system?

The proof of freedom from defects usually includes a prior cleaning of the sewer pipes, then an optical inspection and / or a pressure test (leak test), as well as a documentation of the measures taken and the results obtained.

In the case of optical inspection, a channel camera is inserted into the pipes via the inspection shaft, an inspection opening in the house or from the public collection channel via the connection channel. Specially equipped cameras can also be advanced into other branches. The optical inspection is usually sufficient for checking the tightness ("optical tightness").

If an optical inspection can not be performed adequately (for example because of poor accessibility), a leak test with air or water pressure is required. Mostly a water pressure test is carried out. The line section to be tested is shut off and filled with water. During the test, the water loss is measured and the result compared with limits.

Before the test, the drainage plan of the property should be checked. If it is no longer up-to-date or important information is missing, it should be updated based on the camera experience. If the drainage plan is missing completely, a new one must be made.

By when do I have to prove the absence of defects in the site drainage system?

In the Drainage Ordinance (EWS) of the City of Landshut, the inspection is regulated in § 11 after the initial production of the land drainage plant and in § 12 the continuous monitoring of the land drainage plant.

In the case of new construction, extension or conversion of the site drainage system (according to a drainage plan according to § 10 EWS), Stadtwerke Landshut will immediately inspect the leakproofness of the sewer pipes for rainwater, sewage and mixed sewers installed in the ground a water level test.

In the ongoing monitoring of older property drainage systems, the property owner has to inspect the equipment to be maintained by him at intervals of 25 years from commissioning at his own expense by a technically suitable entrepreneur and to have the result confirmed by him. In water protection areas, shorter inspection intervals may apply (see provisions of the respective protected area ordinance).

The landowner must provide the city with the confirmation on request. According to § 23 EWS, a transitional period until 31.12.2022 applies.

At the latest, if Stadtwerke Landshut checks the public sewer main lines and property connections as part of the self-monitoring, you must expect that the Stadtwerke demand proof of the absence of defects in your property drainage system.

What should I do if, as the owner, I find damage to my management?

The property owners must organize and finance the rehabilitation of the land drainage system. You can choose either a refurbishment company, which also takes over the redevelopment planning or have the refurbishment measures planned and monitored by an independent specialist office, in order to select a technically meaningful and economical procedure with regard to the large number of refurbishment possibilities. The employees of Stadtwerke Landshut are happy to advise you on basic questions, but do not create any renovation concepts.

After completion of the remediation work, the rehabilitated sewer pipe must be checked again for leaks and the result documented. We also recommend that you agree on a warranty period of at least five years with the executing company and a new leak test before the deadline expires.

Which refurbishment types are there?

The rehabilitation of the damage found in the pipelines is carried out either in open construction by digging and renewal of the defective pipes or trenchless by pulling a so-called inliner (new plastic pipe) into an existing, defective pipe.

There is also the possibility of renewal in open construction or with lining, coating or sealing measures when reconditioning shafts.

The type of restoration that is best for your property drainage system depends on many factors, including the number and type of damage, the condition of the pipes and sleeves, the accessibility of the pipes and the number of branches. Sometimes it may be useful to reschedule the land drainage system and shut down lines that are no longer needed, consolidate pipelines or drain rainwater on the property.

What is the cost of leak testing and renovation?

The costs depend heavily on the respective conditions (line lengths, accessibility, type of damage and scope). As a rough guide to normal cases, you can expect between € 700 and € 1,000 for cleaning and inspection and € 1,000 to € 8,000 for refurbishment. Collective orders for multiple neighboring properties can often result in significant cost savings. These details are without guarantee.

How do I find a suitable specialist company?

With the following tips we would like to help you to find the right partner for your project:

  • Companies can be found in the local business directory (for example, "Yellow Pages") or Internet search engines under the keywords "Kanal Landshut" or "Kanalsanierung Landshut", etc.
  • We recommend that you obtain an offer from several companies.
  • For all work around the private sewers only specialist companies should be commissioned. Qualified professionals and companies can be identified, for example, by certificates and quality marks from DWA, ICT, TAH, VSB, RSV or RAL quality assurance.

Protection against backwater


Basements are threatened with a particular unwelcome form of moisture against which it has to be secured: a backwater from the public sewer system. This can happen, for example, during heavy rain or when the public sewer system becomes blocked. In the event of backwater, for example, wastewater can penetrate into basements via wash basins, washing machines, floor drains or toilets and cause damage.
Owners can protect themselves through a backwater protection. The drainage statute of the city of Landshut provides homeowners with such a safeguard in § 9 (6): "Against the backwater of the wastewater from the drainage device, each subscriber has to protect itself. Unless otherwise specified by the city for the individual case, the road level at the junction shall be assumed to be the backflow level. "

For example, a wastewater lifting plant can help. Lifting systems collect the wastewater that accumulates under the backflow level in appropriate storage containers and then pump it via the backflow loop into the sewer system. Easier backflow stops interrupt the flow in backflow-prone sewers through valves, gate valves or pinch valves.

Experts, who should always be consulted for the installation of such fuses, advise mostly to sewage lifting equipment. Because only with her the house drainage in the basement rooms remains fully operational. The backup against backwater is only effective if they are regularly maintained. Homeowners have to expect a backwater, even if it has not come to that. Sanitary installers are the right contact person and are happy to clarify.

Further information on this subject can be found in the flyer "Protection against backwater".

Introduction of groundwater

For construction projects in the groundwater area or for pumping tests on private land, it may be necessary to build up or discharge discharged groundwater into the public sewer system if there is no possibility of seepage (eg no suitable infiltration areas or contaminated groundwater prevails) or other diversion (eg, inflow into a body of water).

Eine Genehmigung zur Einleitung von Grundwasser in die öffentliche Kanalisation ist bei den Stadtwerken Landshut, Bereich Abwasser, zu beantragen. Bitte reichen Sie dazu per E-Mail an einen Lageplanauszug mit Darstellung der Lage der vorgesehenen Bauwasserhaltung bzw. den Brunnenbohrungen ein und geben Sie bitte die voraussichtliche Einleitungsmenge und den vorgesehenen Pumpenzeitraum zur Beurteilung an.

Vorbehaltlich einer wasserrechtlichen Erlaubnis gem. § 2 Abs. 1 Wasserhaushaltsgesetz erhalten Sie nach Prüfung der Unterlagen im Regelfall eine „Sondervereinbarung über ein Benutzungsverhältnis nach § 7 der Satzung für die öffentliche Entwässerungseinrichtung der Stadt Landshut“ in zweifacher Ausführung, die Sie unterzeichnet an die Stadtwerke Landshut, Abwasser, zurücksenden. Eine Ausfertigung erhalten Sie als Antragsteller nach Unterzeichnung durch die Stadtwerke Landshut wieder zurück.

" Continue reading

Die Einleitungsgebühr beträgt derzeit 0,96 € pro Kubikmeter. Alle entstehenden Kosten und Gebühren hat der Antragsteller zu tragen.

Wichtig, für Sie zu beachten:

  • The necessary measures in the public traffic area for securing the drain line and the discharge shaft must be initiated by you as the applicant. In addition, all other provisions of other relevant departments must be observed.
  • Der Beginn und das Ende der Wasserhaltung sowie alle Störungen und Unterbrechungen sind beim Bereich Abwasser der Stadtwerke Landshut zu melden.
  • The amount of water must be measured by a water meter or other suitable measuring device. In the case of a raiding unit, the raid heights are to be measured every two hours during the day and entered in a list that must be sent to the public utilities after completion.
  • Vor Einleitung in den Kanal ist das Wasser über eine Absetzvorrichtung zu entsanden. Ablagerungen im öffentlichen Kanal, die durch die Einleitung entstanden sind, werden auf Kosten des Antragstellers beseitigt.

If you have further questions about discharging groundwater, you can call 0871 1436 2502 or send an e-mail to turn.

Baumaßnahmen im Grundwasserbereich

Haben Sie Fragen zur Einleitung von Grundwasser?


Phone: 0871 1436-2502