Which town has the softest water in Ireland?

South Dublin on Ballymore Eustace and Vartry water is about 50 mg/L, as is Cavan town on lake water. Connemara and most upland supplies are softer again.

At what point is a water softener worth it?

From about 200 mg/L up. Below that you are mostly paying for convenience. Above 300 the saving on immersion elements, shower heads, appliances and detergent is clear.

Readings from Uisce Éireann supply-zone data and regional estimates
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Updated October 2026

Ireland's hard water map 2026

Where is the hardest water in Ireland?

Every town we have a public-supply reading for, ranked from hardest to softest, on one map. Tap a dot or a row to see the reading, where that town's water comes from, and whether a softener is worth it there. We've mapped 40 places so far and add towns as we get readings.

Hardest on the map

Softest on the map

How much of Ireland is hard

mg/L of calcium carbonate (CaCO₃), the standard measure. Dots marked "est." in the table are regional estimates rather than an Uisce Éireann supply-zone figure. Private wells are not on this map: they vary house to house and need a lab test.

Every town, ranked

0 places shown, hardest first

#	Place	Hardness	mg/L	Band

Not on the list? Type your Eircode and we'll show your own area's reading.

What the numbers mean for your house

Hardness is dissolved calcium and magnesium, picked up as water runs over limestone. The higher the number, the faster scale builds in the kettle, the immersion, the shower and the boiler.

SoftUnder 100 mg/L

Lake and upland water, mostly. Kettles stay clean, soap lathers easily. A softener is a waste of money here. South Dublin, Cavan town and Connemara are the obvious examples.

Moderately hard100 to 199 mg/L

A light film in the kettle after a few months, some spotting on glass. Most people live with it. Galway city and the west Dublin blend sit here.

Hard200 to 299 mg/L

Scale on the shower screen within weeks, a crust on the immersion element inside two years, more detergent for the same wash. This is where a softener starts paying for itself.

Very hard300 mg/L and over

Meath, Louth, Kildare, the midlands and north Fingal. Elements fail early, combi boilers lose efficiency, taps and shower heads clog. A softener is the normal fix, not a luxury.

See the softeners we fit Work out your size On a well? Get it tested

Use this map

Journalists, bloggers, estate agents, county councils, teachers: the map and the table are free to use. All we ask is a credit and a link back to this page. Add the embed on the right and it stays up to date as we add towns, or download the map as an image.

Questions about the figures, or a reading for a town we haven't covered yet? Email info@ecofilter.ie. If you have a recent lab report for your supply we'll gladly add it.

Download the map image Ask about a reading

Embed code, with credit built in

<a href="https://ecofilter.ie/pages/hard-water-map" title="Ireland's Hard Water Map 2026 by EcoFilter Ireland"><img src="https://ecofilter.ie/cdn/shop/files/ireland-hard-water-map-2026.png" alt="Ireland's hard water map 2026: every town ranked by water hardness" style="max-width:100%;height:auto"></a>
<p>Source: <a href="https://ecofilter.ie/pages/hard-water-map">Ireland's Hard Water Map 2026</a> by EcoFilter Ireland</p>

Paste it into any page or article. The credit line is part of the licence.

How the map is made

Figures are total hardness as mg/L of calcium carbonate, the measure Uisce Éireann uses in its drinking water reports.
Where Uisce Éireann publishes a supply-zone figure for a town, that's the number on the map.
Where it doesn't, we use a regional estimate for the geology that supply sits on, and mark it "est." in the table. These are indicative, not a lab result for your tap.
Bands follow the usual Irish convention: under 100 soft, 100 to 199 moderately hard, 200 to 299 hard, 300 and over very hard.
Private wells and group water schemes are left out on purpose: two wells on the same road can differ by hundreds of mg/L.

Which town has the hardest water in Ireland?

On public supplies, the Boyne towns in Meath come out on top: Trim, Navan, Kells and Ashbourne all run around 355 mg/L, with readings up to 380 around Trim. Balbriggan and Skerries on Bog of the Ring groundwater are close behind at 336, then Naas and Newbridge on Kildare groundwater at 325.

Which town has the softest water?

South Dublin, on Ballymore Eustace and Vartry water, is about 50 mg/L, and so is Cavan town on lake water. Connemara and most upland supplies are softer again. If you live on one of these, you don't need a softener and nobody should sell you one.

Is Dublin water hard or soft?

Both. North and west of the Liffey, on Leixlip water, it's hard at around 200. The south side on Ballymore Eustace and Vartry water is soft at around 50. Dublin 10, 12, 20 and 22 get a blend at about 155. North Fingal around Balbriggan is very hard at 336. Your Eircode decides which, so check it on the Dublin page.

How do I check my own house?

Put your Eircode into our hardness checker and the supply-zone reading comes straight back. For a private well, order a lab test; the map can't tell you anything useful about a well.

At what point is a softener worth it?

From about 200 mg/L up, which is the orange and red dots. Below that you're mostly paying for convenience. Above 300 the maths is easy: immersion elements, shower heads and appliances last longer, and you use less detergent.

Can I use this map in an article or a report?

Yes. Credit "EcoFilter Ireland" and link to this page. The embed code above does both for you.

Softeners, town by town

Each page has the local reading, where that supply comes from, and what we fit there.

Red or orange dot over your house? Ask a plumber.

Send us your Eircode and a photo of where the mains comes in. We'll tell you the right size, the fitted price, and whether a softener is even the right answer for your water.

Get a quote 01 554 6266

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