Photo: Darrin Antrobus · CC BY-SA 2.0Drumsna has low radon and steady ground, but its flood exposure isn’t measured
Drumsna has no Hazard risk Grade: Irish places under 1,000 residents aren’t graded. The figures below are still its own.
What stands out about Drumsna’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 Drumsna faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Low-lying homes
Radon
Landslides
Ground heights
Drumsna has no Hazard risk Grade
Each figure is placed among Irish towns as the grade would place it, without a letter.
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. No full LiDAR here (57% of homes): the rest of the heights come from a 30 m satellite model, which reads roofs and trees as ground, so this town’s figure isn’t counted. A small place (171 homes): a few houses move the figure a lot.
How many of Drumsna’s homes stand low isn’t measured
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.
Flooding isn’t measured in Drumsna: only 57% of its homes stand on LiDAR ground heights, and the measure needs 80%, so flood isn’t counted for or against it. That doesn’t mean it doesn’t flood.
A rougher estimate, mostly from a 30 m satellite model, puts about 9.9% of homes low beside the River Shannon. That model reads roofs and trees as ground, so it misses low homes more often than it invents them.
The River Shannon at Jamestown peaked at 3.67 m in December 2015
Each winter’s highest level (October to September) at the OPW’s Jamestown gauge, 1.3 km from Drumsna on the same river, since 2005, in metres above the gauge’s zero. Nine days in ten it runs between 1.77 m and 2.67 m.
- 13 December 20153.67 m
- 4 January 20163.54 m
- 21 December 20153.36 m
- 1 March 20203.29 m
- 12 January 20163.28 m
- 5 December 20153.18 m
Since 2005 the River Shannon has run above its usual top on 320 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 15 on record here.
Source: OPW Hydro-Data (waterlevel.ie/hydro-data), Jamestown gauge (station 26085): 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 Drumsna
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; Drumsna is covered by County Leitrim’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 Drumsna can’t be counted here.
No OPW flood relief scheme protects Drumsna
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 Drumsna’s homes. The OPW builds schemes where the risk to homes is greatest, so most towns have none.
No other place across County Leitrim has an OPW flood relief scheme either.
| Town | Scheme | Designed for | Homes behind it | Away |
|---|---|---|---|---|
| Mullingar Westmeath | Mullingar Flood Relief Scheme | 1 in 100 | 0.2% | 63 km |
| Ballinasloe Galway | Ballinasloe (Derrymullen) Flood Relief Scheme | 1 in 100 | 3.2% | 68 km |
| Tullamore Offaly | Tullamore Flood Relief Scheme | 1 in 100 | 2.4% | 80 km |
| Baile Chláir Galway | Clare River (Claregalway) Flood Relief Scheme | 1 in 100 | 7.9% | 90 km |
| Duleek Meath | Duleek Flood Relief Scheme | 1 in 100 | 12% | 108 km |
| Gort Galway | Gort River (Bridge Street) Drainage Scheme | 1 in 100 | 0.9% | 110 km |
No home in Drumsna 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
Drumsna 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).
Drumsna is in the lowest radon band
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; 0% of Drumsna’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).
One EPA-licensed site within 5 km of Drumsna’s centre, none inside it
Factories, farms, power plants and waste sites that hold an EPA licence for their emissions, in Drumsna and around its centre.
| Site | Licence and activity | Away |
|---|---|---|
| Masonite Ireland | IPC licence | 2.0 km |
| Carrick On Shannon Landfill | Waste licence | 6.0 km |
| Mohill Landfill | Waste licence | 9.4 km |
| Activity | Sites |
|---|---|
| Waste | 2 |
| Not classed in the register | 1 |
Within 5 km: one under an older IPC licence.
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 Drumsna
Low-lying homes, radon and landslide ground, town by town.
| Town | Low-lying | Radon | Landslides |
|---|---|---|---|
| Drumsna | – | 0% | 0% |
| Carrick-On-Shannon 4,743 · 5.7 km | 23% | under 0.1% | 0% |
| Mohill 1,027 · 9.3 km | 0% | under 0.1% | 0% |
| Drumshanbo 1,240 · 13 km | 2.6% | 0.1% | 1.5% |
| Ballinamore 1,112 · 19 km | 0% | 3.3% | 0.2% |
Of the places around Drumsna, Carrick-On-Shannon has the most homes standing low by big water (23%), 5.7 km away.
A dash under Low-lying: not measured there (too few homes with detailed ground heights), not none.
Get ready for what Drumsna 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 Drumsna
Does Drumsna flood?
For a single address, the OPW’s official flood maps and past floods are on floodinfo.ie.
Is radon a problem in Drumsna?
The EPA’s map estimates that about 0% of homes around Drumsna are above the radon reference level of 200 Bq/m³: a lower share than in 97% of Irish towns. 0% of its homes are in a High Radon Area. The only way to know a house is a three-month test.
Is Drumsna at risk of landslides?
No home in Drumsna stands on ground rated high or moderately high for landslides.
How does Drumsna compare with the places around it?
Radon estimates around Drumsna run from under 0.1% in Mohill to 3.3% in Ballinamore; Drumsna’s own is 0%. Among the places measured in detail, Carrick-On-Shannon has the largest share of homes standing low (23%).
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 · river levels: OPW Hydro-Data (waterlevel.ie/hydro-data) · industrial sites: EPA licence registers. 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).