G Stow have been drilling and maintaining boreholes for over a century.

We have a wealth of experience maintaining our own fleet of drilling rigs and can respond to your water supply needs quickly and efficiently. With extensive industry knowledge covering all geological and site conditions, G Stow can cater for all your borehole requirements – from concept to completion.

Call us today to discuss your water, energy, geothermal or engineering service needs and see how we can help you 01491 834444 or e-mail us

Drilling Boreholes                          

We offer a complete service from feasibility, technical appraisal, pump and equipment selection, costing and drilling.

Planning and managing all health, safety, environmental and CDM requirements.
G Stow will ensure will ensure your project runs safely and efficiently.

We specialise in all aspects of borehole construction and management, provide a unique total M&E service, taking your project from conception to completion.

  • Feasibility
  • Technical appraisal and design
  • Hydrogeological surveys: to provide an indication of the underlying hydrogeology ahead of drilling 
  • Licence application 
  • Test drilling 
  • Costing
  • CDM planning
  • Health & Safety management
  • Environmental management
  • Borehole drilling
  • Restricted access drilling
  • Horizontal access drilling 
  • Mechanical, Electrical and ICA install 
  • Test pumping 
  • Commissioning 
  • Distribution

G Stow are Principal Contractor scheme members and employ CSCS accredited site staff.

We have a variety of drilling methods for various geological conditions:

  • Reverse circulation rotary – Used for large diameter water well drilling generally in soft and unconsolidated formations. This method also puts less pressure on the formation wall and therefore improves development of the well on completion. 
  • Direct flush rotary using mud, air, water and foam – Normally used in smaller diameter borehole drilling at depths down to 900m and in all formation desities from unconsolidated to hard rock drilling. 
  • Cable tool percussion drilling – appropriate where water for drilling is not available. In soft formation, this method of drilling is very efficient. 
  • Down the hole hammer rotary – for hard rock drilling
  • Rotary auger, continuous flight and bucket – used in soft formations for example, piling, soakaway, boreholes, drilling, top hole to start large diameter flooded reverse drilling 

Call us today to discuss your water, energy, geothermal or engineering service needs and see how we can help you 01491 834444 or e-mail us

Borehole maintenance

G Stow support to you does not end with the drilling of the borehole, We deliver a full maintenance service to our customers including the following.

  • Relining wells with market leading industry standard material
  • Borehole drilling
  • Borehole rehabilitation
  • Horizontal collector well construction (radial well collectors)
  • Restricted access drilling
  • CCTV and Geophysical logging
  • Geothermal / ground source heating systems
  • Environmental monitoring of boreholes and camera assessments of water boreholes
  • Pumps, parts and supplies
  • Water level data logging and test pumping reports
  • Test pumping
  • Adit surveys
  • Workshop facilities – mechanical servicing, welding and fabrication
  • M&E installations

These services ensure that your borehole remains in good condition, Regulatory and compliance needs are met, yields are maximised, power consumption costs are minimised, and the lifetime of your borehole is extended to its maximum potential.

Call us today to discuss your water, energy, geothermal or engineering service needs and see how we can help you 01491 834444 or e-mail us

Commercial water boreholes

Along with private customers, we have worked extensively with public water supply companies, farmers, hoteliers and companies requiring a private supply. We drill and maintain water boreholes for many of the UK’s water supply companies.

Call us today to discuss your water, energy, geothermal or engineering service needs and see how we can help you 01491 834444 or e-mail us

Borehole Test Pumping

G Stow is fully equipped to perform test pumping for all purposes and conditions with particular experience in:

  • Step drawdown testing (SDT)
  • Constant rate testing (CRT)
  • Multi borehole combined testing
  • Aquifer recharge testing
  • Packer testing
  • Sand testing
  • Sand testing equipment
  • Temporary borehole pumps 1-310 l/s
  • Temporary head works
  • Generators
  • Temporary VSD control panels
  • Flow meters
  • Temporary overland pipelines
  • Settlement tanks

Call us today to discuss your water, energy, geothermal or engineering service needs and see how we can help you 01491 834444 or e-mail us

Automatic Water Level Recorders

Data loggers gather and store water level fluctuations at pre-determined intervals which can then be downloaded and presented digitally or paper format. Adjustment for barometric pressure is standard. We also utilise the latest technology allowing data to be transferred in real-time directly from the pump back to our engineers for analysis.

Pump Performance Testing

G Stow have a brand new pump performance test facility at Wallingford suitable for testing pumps up to 220 KW

Pumps can be installed in the purpose built test tank, which comprises of a 20m borehole, flow is pumped through various pipework & flow meters then returned to the borehole via baffles within the tank.

Flow, head and power is recorded from the test control panel, which will provide information for a performance curve of the pump being tested to be produced.

The test curve will prove the full operating performance of each pump and provide the efficiency of the unit.

Decommissioning of boreholes

G Stow offer a full borehole and well decommissioning service that meets the Environment Agency’s recommendation for the decommissioning of wells and boreholes.

Call us today to discuss your water, energy, geothermal or engineering service needs and see how we can help you 01491 834444 or e-mail us