# Hard Water Dublin | Water Hardness Dublin by Area URL: https://dublincleaners.ie/guide/hard-water-dublin/ > Hard water in Dublin by area: which suburbs get Leixlip water at 150-300 mg/l, which get soft water at 50 mg/l, and how to tackle limescale. Call 01 230 8646. Comparison # Hard Water Dublin: Which Areas Get Limescale and What to Do ![Lana, founder of Dublin Cleaners](/img/lana-founder-dublin-cleaners-96.webp)By [Lana](/author/lana/), Founder of dublincleaners.ieUpdated 14 November 2026 Quick answer **Dublin's hard water comes mainly from the Leixlip plant**, which measures **150 to 300 mg/l** of calcium carbonate, according to South Dublin County Council. It supplies **Fingal and the north fringe of the city**, and Lucan gets a Leixlip blend. Water from **Ballymore Eustace, Ballyboden, Vartry and Stillorgan** is soft, at about **50 mg/l**. Key takeaways - South Dublin County Council reports total hardness of 150 to 300 mg/l of calcium carbonate leaving Leixlip, against 50 mg/l from Ballymore Eustace, Ballyboden, Roundwood and Stillorgan. - Leixlip supplies over 620,000 customers across Dublin, Kildare and Meath, about 33% of the Greater Dublin Area, according to Uisce Éireann. - Ballymore Eustace is Ireland's largest water treatment plant and supplies over 50% of the Greater Dublin Area's drinking water, according to Uisce Éireann. - Lucan is fed from Peamount Reservoir with blended Leixlip and Ballymore Eustace water, according to South Dublin County Council. - Dún Laoghaire-Rathdown County Council lists Vartry water at a total hardness of 50 mg/l of calcium carbonate. - Uisce Éireann says hard water is not harmful to health and that the law does not require it to be softened. - 150-300 mg/l Hardness of water leaving Leixlip (CaCO3) South Dublin County Council - 50 mg/l Hardness from Ballymore Eustace, Ballyboden, Vartry, Stillorgan South Dublin County Council - 620,000 Customers supplied from Leixlip Uisce Éireann - 50%+ Share of Greater Dublin Area water from Ballymore Eustace Uisce Éireann The hard water Dublin households complain about is a local story, not a citywide one. Whether your shower screen turns white in a week depends on which treatment plant fills your tap. Most of the hard water comes from one plant at Leixlip, while most of south Dublin drinks soft water from the mountains. ## Does Dublin have hard water? Parts of Dublin have hard water and parts have soft water. South Dublin County Council reports that water leaving the Leixlip plant measures 150 to 300 mg/l of calcium carbonate. Water leaving Ballymore Eustace, Ballyboden, Roundwood and Stillorgan measures about 50 mg/l. That is a three to six times difference. In the older English (Clarke) scale used in the same council reply, Leixlip is 15 to 30 degrees and the other plants are 5. The council figures date from November 2014 and describe water as it leaves each plant. Treatment and supply zones have changed since, so treat them as a guide to the pattern, not a reading for your street. The figures still explain why a [deep cleaning service](/deep-cleaning/) spends far longer descaling in some suburbs than others. ## Which Dublin areas get hard water from Leixlip? Leixlip water reaches Fingal, the north fringe of the city and Lucan. The Irish Times reported in 2002 that the expanded plant would supply “the Fingal area of north Dublin, the north fringe of the city, north-east Kildare and the east of Co Meath”. Uisce Éireann now puts Leixlip’s reach at over 620,000 customers, about 33% of the Greater Dublin Area. Area Main source Hardness leaving the plant What to expect Fingal: Blanchardstown, Castleknock, Swords Leixlip 150-300 mg/l Heavy limescale North fringe of Dublin city Leixlip 150-300 mg/l Heavy limescale Lucan and Adamstown Leixlip and Ballymore Eustace blend (Peamount Reservoir) Between the two Moderate to heavy South-west Dublin: Tallaght, Citywest Ballymore Eustace and Ballyboden about 50 mg/l Light Dún Laoghaire-Rathdown Vartry (Roundwood) and Stillorgan about 50 mg/l Light The council reply names plants, not streets, so the area column is our reading of each network; your Eircode check is the final word. Lucan is the mixed case. South Dublin County Council says Peamount Reservoir supplies the Lucan area with “blended Leixlip/Ballymore Eustace water”. Homes there see more scale than Tallaght but less than Blanchardstown. If you live in D15, our page on [cleaners in Blanchardstown](/service-areas/blanchardstown/) covers the local limescale work. ## Which Dublin areas have soft water? Most of south and south-east Dublin has soft water, at about 50 mg/l. Ballymore Eustace, in Co. Kildare, is Ireland’s largest water treatment plant and supplies over 50% of the Greater Dublin Area, according to Uisce Éireann. Its treated water travels by two pipelines to Saggart Reservoir. Dún Laoghaire-Rathdown County Council lists Vartry water from Roundwood at a total hardness of 50 mg/l, with calcium hardness of 40 to 45 mg/l. Homes on that supply rarely see the thick white crust common in Fingal. Soft water still leaves marks. Soap scum, water spots on glass and grime on shower trays build up anywhere, but they wipe off far more easily than hard scale. A good clean deals with both, adjusting the time spent on descaling to the supply. ## How do you check your own water hardness? The fastest way is Uisce Éireann’s hard water checker. Enter your Eircode or address and it shows how much calcium carbonate is in your water supply zone. The higher the level, the harder the water. Use it rather than a postcode guess, because city supplies are blended. A street near a zone boundary can switch source during works or high demand. Signs at home are a fair cross-check: a white crust inside the kettle, scale on the shower head and cloudy glassware all point to hard water. ## Is hard water in Dublin a health or cleaning problem? It is a cleaning and appliance problem, not a health one. Uisce Éireann says hard water “isn’t harmful to your health” and may even offer health benefits. It does not soften supplies, partly because the law does not require it. The cost shows up as limescale. Uisce Éireann explains that heated hard water forms a white calcium deposit inside kettles, appliances and heating systems. It also reduces how well detergents and soaps work, so you use more of them. In a home on Leixlip water, the bathroom takes most of the hit. Shower screens, taps, shower heads, tiles and toilet bowls all collect scale, and a thick layer takes real time to remove. That is why descaling takes up much of a deep clean in north and west Dublin. ## How do you deal with limescale at home? Prevent it where the water is heated, and remove it before it thickens. Uisce Éireann gives these steps for hot water appliances: 1. Use a stainless steel descaler or scale collector in the kettle, and do not leave boiled water sitting in it. 2. Descale the kettle regularly, following the manufacturer’s instructions. 3. Use the dishwasher’s built-in water softener, and water-softening products in the washing machine if needed. 4. Lower the temperature setting of your water heater, which helps reduce scale build-up. 5. Consider a domestic softening unit if hard water is a real problem; ask a plumber for advice. For bathrooms, little and often works best. Squeegee the shower screen after each use, wipe taps dry, and use a descaler made for the surface. Check the care guide for natural stone and plated taps before using any acid product. Never combine products. The Health and Safety Authority’s home chemicals guidance says: “Don’t mix chemicals.” That matters most with descalers and bleach, which people often use in the same bathroom. ## When is a professional clean worth it for limescale? A professional clean is worth it when scale has built up for months and wiping no longer shifts it. Thick deposits on glass and chrome need soaking time, the right descaler and care not to damage the finish. Homes on Leixlip or blended water reach that point fastest. Our page on [cleaners in Lucan](/service-areas/lucan/) covers the blended supply area in detail. North Fingal sits on Leixlip water, and our page on [cleaners in Swords](/service-areas/swords/) covers it. For prices by home size, our guide to [deep cleaning costs](/guide/deep-cleaning-cost-dublin/) explains how limescale affects a quote. Want a fixed price instead? Call 01 230 8646. Give us the bedrooms, bathrooms and area, and we will give you a price on the phone. [01 230 8646](tel:+35312308646)[Request quote](/contact/) ## Frequently asked questions Is Dublin water hard or soft? Both, depending on the supply. Water from Ballymore Eustace, Ballyboden, Vartry and Stillorgan is soft, at about 50 mg/l of calcium carbonate. Water from Leixlip is hard, at 150 to 300 mg/l. Leixlip mainly supplies Fingal and the north fringe of the city, so north and west Dublin see the most limescale. Is hard water in Dublin safe to drink? Yes. Uisce Éireann says hard water is not harmful to health and that its mineral content may offer health benefits. It does not soften supplies, because softening removes those minerals and the law does not require it. The issue is limescale on appliances and fittings, not safety. How do I check the hardness of my water? Use the hard water checker on the Uisce Éireann website. Enter your Eircode or address and it shows the calcium carbonate level in your water supply zone. The higher the figure, the harder the water. This is more reliable than a map, because supply zones can be blended or switched. Does Lucan have hard water? Lucan gets blended water. South Dublin County Council says Peamount Reservoir supplies the Lucan area with blended Leixlip and Ballymore Eustace water. When the supply was unblended from Leixlip, the council noted the pH rose. Expect more limescale than in Tallaght but less than on pure Leixlip water. Should I install a water softener in Dublin? Only if limescale is a real problem and you are on a hard supply. Uisce Éireann says a domestic softening unit is an option and suggests asking a plumber or hardware store, but it cannot recommend any particular unit. In soft water areas such as most of south Dublin, a softener adds little. ## Sources 1. [South Dublin County Council, reply on water hardness by treatment plant (Lucan Area Committee)](https://meetings.southdublin.ie/Home/ViewReply/45006) (2014-11-25) 2. [Uisce Éireann, Hard water](https://www.water.ie/help/water-quality/hard-water) (2026-11-14) 3. [Uisce Éireann, Crews begin next phase of Leixlip Water Treatment Plant upgrade](https://water.ie/news/crews-begin-next-phase-of) (2022-10-13) 4. [Uisce Éireann, Ballymore Eustace Water Treatment Plant upgrade](https://www.water.ie/projects/local-projects/ballymore-eustace-water-treatment-plant-upgrade) (2026-11-14) 5. [Uisce Éireann, Ballymore Eustace to Saggart Reservoir resilience project](https://www.water.ie/projects/local-projects/ballymore-eustace-water-treatment-plant-saggart-reservoir-resilience) (2026-11-14) 6. [Dún Laoghaire-Rathdown County Council, Vartry Works water quality guide values](https://dlrcoco.ie/sites/default/files/atoms/files/parameter_guide_values_vartry_2013.pdf) (2013) 7. [The Irish Times, Treatment plant to secure Dublin water supplies](https://www.irishtimes.com/news/treatment-plant-to-secure-dublin-water-supplies-1.412085) (2002-02-01) 8. [Health and Safety Authority, Use chemicals safely at home and in the garden](https://www.hsa.ie/media/1nfngryi/use-chemicals-safely-at-home-and-in-the-garden.pdf) (2026-11-14) ![Lana, founder of Dublin Cleaners](/img/lana-founder-dublin-cleaners-192.webp) About the author: [Lana](/author/lana/) Founder of dublincleaners.ie, Lana's company brings expertise in both residential and commercial cleaning services fostering a clean, healthy environment. Outside of work, you'll often find her hitting the gym or immersing herself in invigorating body balance classes.