D.T.O.S. Water has been a trusted name in the field of Water technology Ireland,
specializing in well drilling cork and water pump installation cork. Our expertise covers the entire southern region of Ireland.

Having accumulated over 48 years of experience, we have successfully drilled numerous wells and installed thousands of water pumps, earning a strong reputation for delivering dependable and hassle-free water supplies. Our commitment to customer satisfaction is reflected in our comprehensive range of services, starting from meticulous planning and design, all the way to efficient installation and commissioning. We also offer a dedicated 365-day, round-the-clock callout service to ensure prompt assistance whenever you need it.

About Us

Serving the water and dairy industries, and currently run by father and son, Denis T. and John O’Sullivan, the business originated as an agricultural machinery repair business. However, it later branched into water pump systems, water treatment and water filtration. An expanding market at the time, Dairymaster Milking Machines were slowly becoming increasingly popular throughout Ireland and as a result, the need for local agents grew.

Seeing this gap in the market, Denis became a local agent for Dairymaster, becoming the vital link between manufacturer and consumer, serving farmers in the South of Ireland. Soon after, Dairymaster became the market leader in Ireland, diversifying into several different markets such as scrapers, milk cooling, heat detection and feeding equipment.

Today, as a result of the removal of milk quotas, an increasing amount of Irish Dairy Farmers are expanding and investing in new technology, leading to an increase in the amount of new milking parlours, and wells being installed and fitted. Similarly, as a result of the introduction of water charges, more and more Irish consumers are seeking to install their own domestic, private, water source.

Site Visit & Valuation

The process of drilling for your own water well supply starts with an initial consultation to discuss your requirements and a site visit. Upon visiting, any queries you may have regarding well depth, well location, offsetting, pump size etc. will be answered and free quotation will also be provided.



Water Testing & Analysis

Occasionally private water supplies – water wells and springs, produce water of a quality that is inconsistent with the proposed use, whether this may be potable water supply, agricultural use, industrial use or other activity. D.T.O.S. Water provides the facility to test the water in your home or business. It is vital that water is safe for consumption and the intended use, we offer a full range of solutions to most water problems, including water softeners, pH correction, odour removal, bacteria removal, nitrates removal and sediment/colour filtration.

We cover every aspect of water testing, from supplying water testing kits, to on-site testing, including domestic, commercial, industrial and agricultural premises.

Working with market leading analytical laboratories D.T.O.S. Water can provide water analysis ranging from standard commonly occurring determinants for potable supply through to determinants that are associated with water bottling regulations. Water analysis reports are sourced through an independent lab, located in Cork, that complies with the EU Drinking

Upon receiving the lab report, the results are then interpreted and assessed for the client and a solution to the problem is provided.
Once the client specific treatment/filtration system has been designed and installed, the water is then tested once again to ensure that the problem has been eliminated and that a healthy and safe water supply has been restored.

Hear what our Customers have to say

Water Filtration & Treatment

Here at D.T.O.S. Water, every aspect of the water treatment service market is covered. This includes the supply and installation of new systems, repairs to existing systems, maintenance contracts and upgrades to existing water treatment systems or plants.
D.T.O.S. Water are a highly experienced and proven provider of water treatment solutions. These range from complex municipal and industrial water treatment systems (group water schemes, water treatment plants etc) to single domestic units (water softener, water filtration etc). Our clients range from homeowners to large multinational and municipal authorities.
D.T.O.S. Water has experience specifying, supplying, installing and commissioning suitable filtration and UV Water Treatment purifying equipment to correct the water to the clients requirements or human potable water standards. Private water supplies can be made suitable both chemically and bacteriologically.
Some of the water treatment services we provide:
Mineral Reduction:
Water contains various minerals some of which are iron, manganese, and aluminium. However, when certain minerals are in high concentrations, they can become problematic and may even be bad for our health, or for the health of livestock. Elevated iron, manganese and hardness (calcium and magnesium) are common in borehole water supplies, and can be easily remedied.
D.T.O.S. Water has over 40 years of experience in modern, cost-effective, treatment systems for minerals such as iron and manganese, treating for water hardness and making water softer. We also have a lot of experience of dealing with other minerals.


  • Treatment for iron and manganese
  • Water hardness treatment to prevent limescale build-up
  • Experience with a wide range of minerals
  • Treatment for taste and odour improvement
  • Cost effective solutions
  • Client specific water treatment solutions
  • Experience with different premium brands in the water treatment market
  • Maintenance contracts arranged
  • Liaison with regulatory bodies on the clients behalf