In Ashbourne, 97% of recent property sales sit inside an OPW flood zone. In Dublin 2 it’s 95%. Everywhere else in the country, flood exposure is under 3%. That gap matters, because a viewing rarely tells you: you’ll walk a place on a dry Tuesday, the river down the road will look lovely, and it’ll never cross your mind that the same river was in someone’s sitting room three winters ago. So before you fall in love with a place, ask the three questions every buyer actually has and nobody answers straight: does it flood, is the water clean, and how far is a decent beach?
The answers are all sitting in public datasets — OPW flood maps, EPA water-quality monitoring, and the Blue Flag beach registry. The catch is they live on three separate government websites that don’t talk to each other. So we did the tedious bit for you: pulled all three together, spatially joined them to 60,522 recent Property Price Register sales, and built an Environmental Score for every Irish Eircode area with enough sales to rank. Here’s what the data actually says.
How the score works
Nothing proprietary here, nothing modelled up in a lab — just three public datasets, combined. For each Eircode routing key (basically your Eircode area) we work out the share of recent sales sitting inside an OPW flood zone, the EPA water-quality status of the nearest monitored river or lake, and the straight-line distance to the nearest Blue Flag beach. That’s it.
- Flood exposure (50 pts). Percentage of recent sales in the area that fall inside an OPW CFRAM flood zone (fluvial or coastal, 100-year return period). 0% → 50 pts; 1–3% → 40; 3–7% → 25; 7–15% → 10; 15%+ → 0.
- Water quality (30 pts). EPA status rating of the nearest monitored waterbody. High → 30; Good → 25; Moderate → 15; Poor → 5; Bad → 0.
- Blue Flag beach proximity (20 pts). Distance from the area centroid to the nearest Blue Flag or Green Coast beach. Within 3 km → 20; 3–10 km → 12; 10–25 km → 5; beyond 25 km → 0. This rewards coastal amenity; landlocked areas are capped at 80 on the composite, which is a deliberate trade-off.
The two that stopped us in our tracks
When we ran the flood numbers, two areas jumped out so far ahead of the rest that we double-checked the code. Have a look at these two:
| Area | Eircode | Recent sales | % in flood zone | Dominant flood type |
|---|---|---|---|---|
| Ashbourne & surrounds (Meath) | A84 | 314 | 97.1% | Fluvial (Broadmeadow River) |
| Dublin 2 (Trinity / Temple Bar / Docklands) | D02 | 418 | 95.5% | Fluvial + coastal (River Liffey estuary) |
For every other routing key in our 126-area sample, flood exposure is under 3%. Let that land for a second. These two areas aren’t at the top of the distribution — they are the distribution. Everything else is a rounding error by comparison.
And the reason is geography, plain and simple. Ashbourne sits on the Broadmeadow River floodplain — the town has documented surface-water and fluvial flood events, and the CFRAM 100-year model spreads across much of the residential grid. Dublin 2 sits on the lower Liffey, where the model combines a riverine flood with a coastal tidal surge. Much of the city centre — Temple Bar, the quays, the Docklands — falls inside that combined extent.
Now, before anyone panics: this does not mean every house in these areas is about to go under. A “100-year flood zone” means a 1% chance in any given year under the CFRAM model — a statistical risk, not a date in the diary. Plenty of these properties sit behind flood defences or above the predicted water depths. But the zone status still matters, and it matters in three ways that hit your pocket: insurance (pricing inside a zone versus outside is night and day), future risk as the climate shifts (the modelled envelope only grows), and resale (more and more buyers now check the OPW map themselves before they bid).
The next eight — and why they’re all river towns
After D02 and A84 the whole thing calms right down. The third-most-exposed area, Macroom, is at 2.7% — a world away from the top two.
| # | Area | Eircode | % in flood zone | Recent sales |
|---|---|---|---|---|
| 3 | Macroom / mid-Cork | P72 | 2.7% | 222 |
| 4 | Wexford town & north Wexford | Y14 | 2.2% | 461 |
| 5 | West Cork — Bandon | P81 | 1.8% | 283 |
| 6 | Ennis & east Clare | V42 | 1.6% | 193 |
| 7 | Clonmel & south Tipperary | E32 | 1.6% | 193 |
| 8 | Gorey & north Wexford | Y21 | 1.4% | 729 |
| 9 | Cahir & west Tipperary | E53 | 1.2% | 173 |
| 10 | Waterford city | E91 | 1.2% | 484 |
Look at that list and you’ll spot the pattern yourself: they’re nearly all river towns. Macroom on the Sullane, Clonmel on the Suir, Wexford on the Slaney, Ennis on the Fergus, Waterford on the Suir again. So here’s a rule of thumb worth keeping: if you’re buying in a town that’s named after or built beside a river, “check the OPW flood map” goes on your due-diligence list as a default, not an afterthought.
Water quality — a completely different map
Flood is one story. Clean water is another, and it draws a very different map of Ireland. The EPA monitors 4,840 waterbodies under the Water Framework Directive, tagging each one High, Good, Moderate, Poor or Bad. The nearest monitored waterbody to a house is a fair proxy for the background water quality around it — it won’t tell you about your drinking water (that’s treated before it reaches your tap), but it tells you about the stream at the end of the road and the river you might fancy a swim in.
Areas where the nearest monitored waterbody is rated “High status” — the very top EPA rung — are genuinely rare. In our sample, the areas with a nearest-High waterbody inside 5 km are all clustered in the south-west: West Cork (P75 around Bantry, P85 the Skibbereen/Clonakilty hinterland), south Kerry (F23), Connemara (F45), and a scattering of upland Wicklow and west Offaly. That’s the cleanest background water in the country, and there’s not much of it.
At the other end, the “Poor” areas cluster in the western midlands (R32 Portlaoise, R51 Kildare town, R35 Tullamore), parts of west Dublin (D10, D15, D22, D24, K78 Lucan), Cork city (T12), and H14 (Monaghan). Some of that is farming pressure on the catchment; some is urban stormwater. Either way, it’s a signal worth clocking — the river at the end of that road is not pristine.
The cleanest spots overall: two coastlines
Roll all three signals together and the top of the ranking is owned by two clusters. If you want the full clean sweep — no flood, good water, a beach nearby — this is where the data sends you.
The Dublin coast, north and south
K32 Balbriggan/Stamullen leads at 95 (0% flood, Good water within 1.3 km, Front Strand Beach within 900 m), with D18 Foxrock/Cabinteely (87 — Seapoint Blue Flag at 4.5 km), K45 Lusk (87 — Portrane Beach at 5.1 km), A98 Bray (87 — Bray South Promenade at 3.1 km), D13 Sutton/Baldoyle (85 — Burrow Beach at 1.9 km), and D04 Ballsbridge/Sandymount (85 — Sandymount Strand at 1.6 km) all scoring high. No great shock, really: these are places people have always chosen for the coast, and the environmental data just backs up the reputation.
The Cork coast and West Cork
P17 Kinsale ties for first at 95, with P24 Midleton / East Cork, P43 Carrigaline and the Cork south suburbs, P85 Skibbereen / Clonakilty, and F23 west Cork / south Kerryall landing in the high 80s. P85 and F23 do something special — they pair zero flood exposure with High-status water (not just Good), which in the Irish context is about as clean a profile as you’ll find.
If a beach isn’t your thing
Fair play if the sea leaves you cold — plenty of people would take a paddock over a promenade any day. The score does lean toward the coast on purpose, so it’s not built for you. The better question for an inland buyer is: which inland areas pair zero flood exposure with Good-or-better water? Here’s your shortlist:
- F12 Athlone / south Roscommon — Good water at 4.3 km
- F45 east Galway / Roscommon — Good water at 0.9 km
- H53 Carrick-on-Shannon — Good water at 1.2 km
- P12 Mallow / north Cork — Good water at 2.2 km
- P56 Fermoy / north Cork — Good water at 0.8 km
- P61 Macroom hinterland — Good water at 2.6 km
- C15 Maynooth / Leixlip (though only Moderate water)
Beyond those, inland Ireland mostly settles at Moderate water status — the familiar background hum of agricultural pressure on the midland rivers.
So what do you actually do with this?
Here’s the practical bit — the four moves worth making before you sign anything:
- Buying in Dublin 2 or Ashbourne? Pull the OPW flood map for the specific address before you bid. Area-wide 95%+ exposure doesn’t mean that exact house floods, but it shortens the odds meaningfully. And ask the seller straight out about their flood-insurance history — if there’s been a claim, it’ll follow you onto your premium.
- Buying in a river town? The name is your tell. Macroom, Clonmel, Ennis, Wexford, Waterford, Gorey — each has a real slice of its housing stock in a flood zone. Check the map by default, not as a favour to yourself.
- Chasing clean water? Anywhere west of Bantry or south of Skibbereen is effectively the premium tier for Irish background water quality. The price you pay is the commute to anywhere else.
- Weighing coastal against inland? Our score favours the coast, but that’s a preference, not a fact of life. If beaches genuinely don’t move you, just use the flood and water components — plenty of inland areas score perfectly on those two.
None of this replaces looking at the actual house you’re after. An area at 1% flood exposure can still hide the one property on the low corner that goes under, and an area at 95% can hide the one on the hill that never has. So use this to know the lie of the land — then check the specific address before you fall the whole way in love.