Ground Water Seepage

Ground Water Drainage Wellington

Groundwater seepage can make lawns or basement rooms unusable due to water soaking carpets and basement walls. When water is ponding on lawns that ground unusable. Water collecting in lawns, and in front of basement banks is often caused by groundwater seepage. It makes the land muddy and wet. It is often found under buildings where there bank in basements and internal inhabited areas are lower than the rear basement surrounding area. This water needs to be collected and drained away.

Water entering basements can cause considerable damage to wall linings, and structural walls can start to rot and mould.

By installing a groundwater drainage system, considerable value can be added to the property.

If the water does not flow on its own via gravity, a pump can be installed to take groundwater seepage to the drains.


Causes of Ground Water Seepage

Causes of Ground Water Seepage Groundwater seepage is common in basements and lawns. Some causes are:

  • Blocked stormwater drains
  • Broken stormwater drains
  • Incorrectly laid stormwater drains
  • Overflowing spouting
  • Spouting downpipes are discharging on to the ground instead of going to drains
  • Installed soak pits without checking on the ability of the ground to drain it away
  • The neighbour had an issue with their land so diverted water to your property
  • Excavation without provision for taking the collected water away
  • Underground spring changes course
  • Neighbour has overwatered their garden
  • Neighbour has an enormous catchment area, e.g., driveway with no provision for the collected water
  • Incorrectly laid paved areas are not draining correctly.

Seepage can have multiple causes, e.g., overflowing spouting, condensation from heat pumps or water heaters, neighbours leaking drains or water supplies, neighbours run off, neighbours sumps overflowing, new construction not having spouting or discharging water onto the ground due to no spouting on roof areas. All roof areas over 10 sq, need spouting going to stormwater drains.

Costs Involved

To inspect a domestic groundwater drainage problem in Wellington and write a report, it can be $461.18. Give us a call to discuss more about your specific requirements.

Prices start at $3500 for groundwater solutions.


Steps to Organize Seepage Collection


  • Arrange site visit
  • Identify the problem and safety issues – The problem can be leaking water supply pipes so pressure testing may be required
  • Dye testing may be needed
  • A visit on a rainy day may be needed to see the problem
  • A hose test cannot generate the volume rainfall does
  • Locate the drainage plan if available
  • Design solution
  • Price solution.

Install Ground Water Seepage System

The work is labour intensive and involves digging trenches below the room floor in the basement and removing that soil from the building often into bins for removal and then transporting in drainage metal and laying drains.

  • Arrange Building Consent if required, most systems do not require oneground water drainage wellington profile of drain in ground
  • Begin digging
  • Install drainage
  • Test and arrange inspection if required
  • Backfill.

Typical Ground Water Seepage Profile Basements

Boggy Lawns

  • Boggy lawns can be caused by a high water table, or the house is built on an old stream bed.
  • Broken drains either yours or your neighbours can be a cause.
  • Broken underground water pipes, or under the building can also be a cause.
  • Runoff from the neighbours due to faulty drainage or irrigation overuse.

Building Consent Requirements

Building Consent Groundwater seepage Wellington

A building consent may be required where an additional drain branch is installed. We can alternatively install a sump where there is an existing downpipe from the roof going into the existing stormwater drainage system, and any new ground water can be connected. In this instance a Building consent would not be needed.

  • Site Visit
  • Visit Territorial Authority (TA) for a copy of their plans
  • Draw plans and specifications of the job outlining the scope of works. Methods of installation, and any information the TA may require
  • Fill out the application form, and pay the TA fee
  • Obtain the consent and start work.
  • Book inspections and arrange a test.
  • Obtain Code Compliance Certificate after drawing any as-built plans.

We have experience of more than 35 years. We are Certified Drainlayers with many years of repairing leaking basements. Call Southern Plumbing now for detecting groundwater seepage in Wellington. We offer emergency drainage services on a 24-hour basis. In addition to plumbing and drainage services, we also offer electrical, roofing. Call us on \.