Well water treatment in Co. Galway

Private wells in Co. Galway

The 2022 Census counted 8,286 households in County Galway on a private well or other private supply, 12.2% of homes outside the city. Another 19,607, or 28.9%, are on a public or private group water scheme. Private supplies are most common around Loughrea (31.5% of homes), Gort and Kinvara (22.0%) and Conamara North (16.7%), while group schemes lead around Tuam (43.7%) and Ballinasloe (35.4%). In Galway City only 48 homes are on a private supply.

Nobody monitors a household well for you. It's classed as an exempted supply, so testing and treating it is down to the owner. Every system we fit in Galway starts with a lab report.

What's usually in a Galway well

Hard water on fast-moving karst

East Galway, from Athenry to Tuam, Monivea and Dunmore, sits on pure limestone that the Geological Survey of Ireland (GSI) classes as karst: rock dissolved into channels, swallow holes and caves. South Galway around Gort and Kinvara is almost all pure limestone too. GSI tracer tests in east Galway showed groundwater moving 100 to 450 metres an hour. In south Galway, hardness at Kinvara ranged from 168 to 372 mg/L and at Roo near Gort from 332 to 348 mg/L.

Bacteria

That speed is what makes karst wells vulnerable: whatever reaches the ground near a well, from a septic tank or a farmyard, can get into it quickly. Group schemes on the same ground have struggled. Ballinakill near Loughrea failed the E. coli standard in 2023, 2024 and 2025, and Monreagh/Tubber on the Clare border failed repeatedly. Galway's 2007 Cryptosporidium outbreak, which put about 90,000 people on a boil water notice, came from public supplies, not private wells. See bacteria in well water.

Iron and rotten-egg smell

Around Loughrea the rock is an impure limestone known as Calp. The water there is hard, 256 to 440 mg/L, iron runs from 0 to 0.9 mg/L, and the GSI says hydrogen sulphide, the rotten-egg smell, is frequently reported. On the sandstone towards the Slieve Aughty hills, small domestic wells tend to show raised iron and manganese.

Softer, acidic water in Connemara

From the south coast up to a line from Clifden to Maam Cross, Connemara is mostly granite, with acidic minerals, and the GSI warns that corrosion and leaching of iron and manganese may be a problem. It also says radon and uranium are associated with granite and present a risk to water quality. North of Clifden, wells measured 75 to 178 mg/L. See acidic water.

What we usually fit in Galway

East and south Galway wells usually need most of this line; Connemara wells start with pH correction and often skip the softener. In treatment order, with stages left out if the report doesn't call for them:

1. Sediment filter to protect everything after it.
2. pH correction where the water is acidic, as on the Connemara granite.
3. Iron and manganese filter, which also deals with the rotten-egg smell and protects the softener.
4. Water softener for the hard limestone water of the east and south.
5. UV disinfection if the report shows E. coli or coliforms, fitted last on the main line so the water reaching the lamp is clear.
6. Reverse osmosis at the kitchen tap for drinking water, if you want it.

On mains water and only bothered by limescale? See our water softener page for Co. Galway instead.

The well grant in Galway

Galway County Council's Rural Water section runs the individual well grant and names filtration and UV as examples of treatment. It wants three quotes for all works. You send your raw water test results and, if treatment is needed, three quotes for it. After approval and installation you send post-treatment results, then the council inspects and takes its own sample. We'll give you an itemised quote for the application.