Photo: Jonathan Thacker · CC BY-SA 2.0An estimated 26% of Tralee’s homes have radon above the reference level
With 21% of its homes standing low beside the River Lee, Tralee grades D for hazard risk, #288 of 321 Irish towns; flood counts only against a town, and here it does.
What stands out about Tralee’s hazards
From the EPA’s radon map, Geological Survey Ireland’s landslide map, the OPW’s flood relief schemes and our estimate of low-lying homes, below.
What Tralee faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Low-lying homes
By the coast
Radon
Landslides
Bathing water
Ground heights
Hazard risk in Tralee: D
Radon, landslide ground and low-lying homes, each against Irish towns, then averaged.
Each figure is placed among Irish towns of 1,000 or more people; the grade averages the three, so a better place on each is a better grade.
Flood counts only against a town, and Tralee’s share of low-lying homes is high enough to lower its grade.
Its place: #288 of 321 Irish towns.
Less sure: The low-lying figure is our estimate from ground heights and the river map, not an official flood map. It can show a town is low-lying; it can’t show a town is safe.
21% of Tralee’s homes stand low beside the River Lee
Low-lying homes, a TownRatings estimate from OPW and Geological Survey Ireland LiDAR ground heights and the EPA’s river map: not an official flood map.
Share of each town’s homes standing low by big water, for the towns measured in detail. 43% have none; Tralee has more than 82% of them.
| # | Town | People | Low-lying | |
|---|---|---|---|---|
| 1 | Naas Kildare | 26,180 | 0% | |
| 2 | Blanchardstown Dublin | 24,613 | 0% | |
| 3 | Jobstown Dublin | 23,437 | 0% | |
| … | ||||
| 33 | Sligo Sligo | 20,608 | 14% | |
| 34 | Dooradoyle Limerick | 18,593 | 15% | |
| 35 | Tralee Kerry | 26,079 | 21% | |
| 36 | Clontarf East Dublin | 18,626 | 21% | |
| 37 | Athlone Westmeath | 22,869 | 22% | |
| … | ||||
| 39 | Ennis Clare | 27,923 | 44% | |
| 40 | Sandymount Dublin | 22,340 | 86% | |
The 40 Irish towns nearest its size that are measured in detail.
Low-lying homes across County Kerry’s towns · 4 towns measured in detail
Tralee ranks 2nd of County Kerry’s 4 towns measured in detail, counting from the most low-lying homes.
Homes: OpenStreetMap buildings of 30 m² or more, not tagged as non-residential, in the town’s Census 2022 Small Areas. Heights: GSI Open Topographic Data LiDAR (OPW, TII and GSI surveys). Water: EPA river network (rivers of Strahler order 5 or more), lakes, estuaries and coastal waters.
The River Lee at Ballymullen peaked at 3.23 m in December 2015
Each winter’s highest level (October to September) at the OPW’s Ballymullen gauge, in Tralee, since 2007, in metres above the gauge’s zero. Nine days in ten it runs between 0.41 m and 1.07 m.
- 5 December 20153.23 m
- 28 June 20173.13 m
- 19 November 20093.03 m
- 14 September 20152.76 m
- 3 February 20142.74 m
- 29 November 20112.73 m
Since 2007 the River Lee has run above its usual top on 2,755 days, most of them in the winters of 2015–16 and 2013–14.
Measured by its highest day, last winter (2025–26) was the 12th-highest of the 19 on record here.
Source: OPW Hydro-Data (waterlevel.ie/hydro-data), Ballymullen gauge (station 23012): daily maximum and mean levels, inspected and provisional data. The usual range is the 5th to 95th percentile of daily means, worked out by TownRatings. Live levels are on waterlevel.ie.
Weather and flood warnings for Tralee
Where to see the warnings in force, and what this page can’t count.
Met Éireann issues yellow, orange and red warnings for rain, wind and coastal flooding county by county; Tralee is covered by County Kerry’s.
| Warning | What Met Éireann means by it |
|---|---|
| Yellow | Weather that isn’t unusual but can be dangerous in places: be aware. |
| Orange | Infrequent, dangerous weather that can put people and property at risk: be prepared. |
| Red | Rare, extremely dangerous weather: take action to protect yourself and your property. |
Met Éireann doesn’t publish an open archive of past warnings, so how often warnings have covered Tralee can’t be counted here.
No OPW flood relief scheme protects Tralee
The Office of Public Works’ completed flood relief schemes and the areas each one benefits (OPW open data, CC BY 4.0).
None of the OPW’s completed flood relief schemes has a benefiting area that takes in Tralee’s homes. The OPW builds schemes where the risk to homes is greatest, so most towns have none.
No other place across County Kerry has an OPW flood relief scheme either.
| Town | Scheme | Designed for | Homes behind it | Away |
|---|---|---|---|---|
| Dunmanway Cork | Dunmanway Flood Relief Scheme | 1 in 100 | 14% | 73 km |
| Mallow Cork | Mallow South & West Flood Relief Scheme | 1 in 100 | 2.6% | 74 km |
| Ennis Clare | Ennis (Upper) Flood Relief Scheme | 1 in 100 | 3.5% | 80 km |
| Annacotty Limerick | Mulkear River (Ballymackeogh) Flood Relief Scheme | 1 in 10 | 1.1% | 90 km |
| Fermoy Cork | Fermoy South Flood Relief Scheme | 1 in 100 | 6.3% | 98 km |
| Gort Galway | Gort River (Bridge Street) Drainage Scheme | 1 in 100 | 0.9% | 106 km |
No home in Tralee stands on landslide-prone ground
Geological Survey Ireland’s landslide susceptibility map (1:50,000), read at every home.
Homes on ground rated high or moderately high
Tralee is among the 64% of Irish towns with no home on such ground.
GSI rates ground from low to high by its slope, soil and rock. Most Irish landslides are on steep upland slopes and peat after heavy rain; a town on flat ground has almost none.
High means the ground could slide under the right conditions, such as days of heavy rain on a steep, wet slope; it isn’t a forecast that it will.
GSI landslide susceptibility, high and moderately high classes, share of the town’s homes on mapped ground (CC BY 4.0).
An estimated 26% of Tralee’s homes are above the radon reference level
The EPA’s radon map: for each 10 km square, the estimated share of homes above the national reference level of 200 Bq/m³.
A square where 10% or more of homes are estimated above the reference level is a High Radon Area; 100% of Tralee’s homes are in one. The map is an estimate by area: two neighbouring houses can differ a lot.
A test is the only way to know a home’s level: two detectors, left for three months in a living room and a bedroom.
EPA radon map of Ireland (10 km grid), averaged over the town’s homes (CC BY 4.0).
2 EPA-licensed sites lie inside Tralee
Factories, farms, power plants and waste sites that hold an EPA licence for their emissions, in Tralee and around its centre.
| Site | Licence and activity | Away |
|---|---|---|
| Henry Denny & Sons Limited | IPC licence | inside |
| Sport Socks Co. (Ireland) Limited | IPC licence | inside |
Within 5 km: 2 under older IPC licences.
An EPA licence sets what a site may release to air, water and land; it doesn’t mark the site as an accident hazard.
Sites holding dangerous substances in bulk come under the COMAH (Seveso) rules, but the HSA’s list of them has no open licence, so upper- and lower-tier sites aren’t counted here.
Source: EPA registers of Industrial Emissions, IPC and waste licences, sites licensed on 31 October 2026; distances in a straight line from the town’s centre.
Hazards in the places around Tralee
Low-lying homes, radon and landslide ground, town by town.
| Town | Low-lying | Radon | Landslides |
|---|---|---|---|
| Tralee | 21% | 26% | 0% |
| Milltown 1,118 · 14 km | 0% | 5% | 0% |
| Castleisland 2,536 · 17 km | 0% | 9.2% | 0% |
Tralee has more of its homes standing low by big water than any measured place around it; the next is Milltown (0%).
A dash under Low-lying: not measured there (too few homes with detailed ground heights), not none.
Get ready for what Tralee faces
What to do, and what to ask before you move.
- Never walk or drive through floodwater: 30 cm of moving water can float a car.
- Move valuables, papers and medicines upstairs.
- Turn off gas, electricity and water if you’re told to.
- Test over three months, in a living room and a bedroom.
- Above 200 Bq/m³, a small sump and fan usually fixes it.
- The EPA sells radon test kits at radon.ie and lists registered contractors who fix high readings.
- Bring in or tie down bins, trampolines and anything the wind can lift.
- Keep away from coastal paths and piers while an orange or red warning is in force.
- Charge phones and keep a torch: fallen lines are the commonest storm damage.
- After the storm, report a fallen line to ESB Networks and keep well clear of it.
- Ask whether the home has ever flooded, and get a buildings insurance quote before you commit: flood cover isn’t always offered.
- Ask the seller or landlord for a radon test result, or test in your first months there.
- Check the address on floodinfo.ie: the OPW’s flood maps and its record of past floods.
What this data can and can’t tell you
- An estimate, not a flood map. Low-lying homes is a TownRatings modelling step: each home’s ground height from LiDAR, against the level of the nearest big river (Strahler order 5 or more), lake or estuary within 1 km, or the sea within 2 km. A home within 5 m of the water’s level, or below 4 m near the sea, counts.
- Flood counts only one way. A high share of low-lying homes lowers the Hazard risk Grade; a low share never raises it, because defences, small streams, culverts, groundwater and flash floods don’t show in ground heights. Below the national median a town scores as the median.
- Defences aren’t counted. Flood defences aren’t taken off: the OPW scheme that protects the most homes is shown instead, with its design standard.
- Measured where the heights are detailed. A town is measured, and counted, only where 80% of its homes stand on LiDAR heights. Elsewhere the page says flooding isn’t measured, never that the town is dry.
- Radon is an estimate by area. The EPA’s radon map gives the estimated share of homes above 200 Bq/m³ for each 10 km square, averaged here over the town’s homes. It says where to test, not what one house holds.
- The sea is measured by height. Homes count as low by the sea when their ground is under 4 m and within 2 km of coastal or estuary water; waves, surges and erosion aren’t modelled.
- Landslide ground is a map of where slides could start. GSI’s susceptibility map rates the ground itself; it doesn’t record past slides or say when one will happen.
- Bathing water is rated season by season. The EPA classes each identified bathing water from four seasons of samples; a rating says how clean the water has been, not how safe it is to swim.
- One town, many streets. Risk is street by street. Check a specific address on floodinfo.ie before you buy or rent.
Check any address against the OPW’s official flood maps on floodinfo.ie
Questions about flooding and hazards in Tralee
Does Tralee flood?
About 21% of Tralee’s homes stand low beside the River Lee: a higher share than in 82% of Irish towns. That is our estimate from ground heights, not an official flood map. For a single address, the OPW’s official flood maps and past floods are on floodinfo.ie.
Is radon a problem in Tralee?
The EPA’s map estimates that about 26% of homes around Tralee are above the radon reference level of 200 Bq/m³: a higher share than in 94% of Irish towns. 100% of its homes are in a High Radon Area. The only way to know a house is a three-month test.
Is Tralee at risk of landslides?
No home in Tralee stands on ground rated high or moderately high for landslides.
Is Tralee at risk from the sea?
About under 0.1% of Tralee’s homes stand below 4 m within 2 km of the sea, against 21% standing low by rivers, lakes and estuaries. Coastal floods come with storm surges and spring tides; the OPW’s coastal maps on floodinfo.ie show the official picture.
How does Tralee compare with the places around it?
Radon estimates around Tralee run from 5% in Milltown to 9.2% in Castleisland; Tralee’s own is 26%.
Where is the nearest bathing water to Tralee?
Fenit, 12 km away, was rated excellent for the 2025 season; 2 identified bathing waters lie within 15 km.
How is Tralee’s Hazard risk Grade worked out?
Tralee grades D: radon, landslide ground and low-lying homes are each placed among Irish towns, and the grade averages them.
Flood: TownRatings’ estimate from ground heights, not an official flood map. Contains Irish Public Sector Data (Geological Survey Ireland, the Office of Public Works and the EPA) licensed under CC BY 4.0; Copernicus DEM © DLR e.V. and © Airbus, provided under COPERNICUS by the EU and ESA; © OpenStreetMap contributors. Radon and bathing water: EPA (CC BY 4.0). Landslide susceptibility: Geological Survey Ireland (CC BY 4.0).
Sources: low-lying homes: TownRatings’ estimate from GSI and OPW LiDAR, Copernicus GLO-30 and the EPA river network · radon: EPA radon map · landslides: GSI landslide susceptibility · bathing water: EPA bathing water quality · river levels: OPW Hydro-Data (waterlevel.ie/hydro-data) · industrial sites: EPA licence registers · the grade: TownRatings, from these figures. Under Creative Commons Attribution 4.0 (CC BY 4.0).
Contains Central Statistics Office (CSO) data, Census 2022, and Tailte Éireann boundaries (CSO Urban Areas, Small Areas, local electoral areas, constituencies), under Creative Commons Attribution 4.0 (CC BY 4.0).