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Crowley, Main Street CorofinPhoto: The Banner · CC BY-SA 3.0
–Not graded
Flood & hazards in Corofin · EPA, GSI and OPW data

In Corofin, radon is the measure to watch: about 28% of homes are estimated over the reference level

Corofin has no Hazard risk Grade: Irish places under 1,000 residents aren’t graded. The figures below are still its own.

28%of homes over the radon level
In brief

What stands out about Corofin’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.

Flooding not measuredNo detailed ground heights cover Corofin, so how many of its homes stand low by big water isn’t measured.High radonAn estimated 28% of homes are above the radon reference level: a higher share than in 95% of Irish towns.Excellent bathing waterBallyallia Lake, Ennis, 10 km away, was rated excellent in 2025.
By hazard

What Corofin faces

Each hazard against its own yardstick; meters run from low to high on that yardstick.

Low-lying homes

Not measured
No detailed heights here
Check the official flood maps

Radon

28%of homes estimated over the reference level
more radon than in 95% of Irish towns
100% of homes in a High Radon Area

Landslides

0.6%of homes on high or moderately high ground
more homes on it than in 85% of Irish towns
Rated from the ground and its slope

Bathing water

excellentBallyallia Lake, Ennis, 10 km
1 bathing water within 15 km
Rated for the 2025 season

Ground heights

0%of homes on detailed ground heights
Too few to count flood (80% needed)
Of 360 homes counted
Not on this page: the OPW’s official flood maps and past floods (their licence doesn’t allow reuse here: see floodinfo.ie), groundwater and surface-water flooding, coastal erosion and industrial sites.
Hazard risk Grade

Corofin has no Hazard risk Grade

Radon (28%)Better than 5% of Irish towns
Landslide ground (0.6%)Better than 15% of Irish towns
Low-lying homesNot counted: not measured here

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 LiDAR here: the heights come from a 30 m satellite model, which reads roofs and trees as ground, so this town’s figure isn’t counted.

Low-lying homes

How many of Corofin’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 Corofin: no LiDAR survey covers its homes, and the measure needs 80% of them, 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 6.9% of homes low beside the River Fergus. That model reads roofs and trees as ground, so it misses low homes more often than it invents them.

Official flood maps and past floods: floodinfo.ie

River levels

The River Fergus at Corrofin peaked at 2.39 m in November 2009

Each winter’s highest level (October to September) at the OPW’s Corrofin gauge, in Corofin, since 1972, in metres above the gauge’s zero. Nine days in ten it runs between 0.21 m and 1.53 m.

Each winter’s highest level, metres
Winter 1972–73: highest 1.69 m · 11 days above the normal rangeWinter 1973–74: highest 1.80 m · 14 days above the normal rangeWinter 1974–75: highest 1.74 m · 11 days above the normal rangeWinter 1975–76: highest 1.67 m · 8 days above the normal rangeWinter 1976–77: highest 1.42 m · 0 days above the normal rangeWinter 1977–78: highest 1.79 m · 12 days above the normal rangeWinter 1978–79: highest 1.73 m · 12 days above the normal rangeWinter 1979–80: highest 1.76 m · 16 days above the normal rangeWinter 1980–81: highest 1.72 m · 16 days above the normal rangeWinter 1981–82: highest 1.65 m · 4 days above the normal rangeWinter 1982–83: highest 1.74 m · 22 days above the normal rangeWinter 1983–84: highest 1.86 m · 38 days above the normal rangeWinter 1984–85: highest 1.78 m · 18 days above the normal rangeWinter 1985–86: highest 1.68 m · 9 days above the normal rangeWinter 1986–87: highest 1.67 m · 15 days above the normal rangeWinter 1987–88: highest 1.70 m · 24 days above the normal rangeWinter 1988–89: highest 1.55 m · 2 days above the normal rangeWinter 1990–91: highest 1.73 m · 22 days above the normal rangeWinter 1991–92: highest 1.72 m · 8 days above the normal rangeWinter 1992–93: highest 1.63 m · 10 days above the normal rangeWinter 1993–94: highest 1.86 m · 46 days above the normal rangeWinter 1994–95: highest 2.04 m on 1 February 1995 · 53 days above the normal rangeWinter 1995–96: highest 1.56 m · 1 days above the normal rangeWinter 1996–97: highest 1.73 m · 11 days above the normal rangeWinter 1997–98: highest 1.67 m · 20 days above the normal rangeWinter 1998–99: highest 1.74 m · 38 days above the normal rangeWinter 1999–00: highest 1.97 m · 36 days above the normal rangeWinter 2003–04: highest 1.70 m · 10 days above the normal rangeWinter 2004–05: highest 1.80 m · 9 days above the normal rangeWinter 2005–06: highest 1.98 m on 22 September 2006 · 9 days above the normal rangeWinter 2006–07: highest 1.86 m · 22 days above the normal rangeWinter 2007–08: highest 1.87 m · 46 days above the normal rangeWinter 2008–09: highest 1.84 m · 39 days above the normal rangeWinter 2009–10: highest 2.39 m on 24 November 2009 · 45 days above the normal rangeWinter 2011–12: highest 1.71 m · 30 days above the normal rangeWinter 2012–13: highest 1.64 m · 9 days above the normal rangeWinter 2013–14: highest 1.88 m · 67 days above the normal rangeWinter 2014–15: highest 1.77 m · 15 days above the normal rangeWinter 2015–16: highest 2.15 m on 26 December 2015 · 79 days above the normal rangeWinter 2016–17: highest 1.74 m · 12 days above the normal rangeWinter 2018–19: highest 1.93 m · 27 days above the normal rangeWinter 2019–20: highest 2.10 m on 26 February 2020 · 46 days above the normal rangeWinter 2020–21: highest 1.78 m · 30 days above the normal rangeWinter 2021–22: highest 1.59 m · 5 days above the normal rangeWinter 2022–23: highest 1.77 m · 43 days above the normal rangeWinter 2023–24: highest 1.89 m · 26 days above the normal rangeWinter 2024–25: highest 1.80 m · 19 days above the normal rangeWinter 2025–26: highest 1.75 m · 25 days above the normal range’09–10’15–16’19–20Record 2.39 m, 2009Top of normal range
1972–732025–26
The highest days on record
  • 24 November 20092.39 m
  • 26 December 20152.15 m
  • 6 December 20152.14 m
  • 14 December 20152.11 m
  • 26 February 20202.10 m
  • 1 February 19952.04 m

Since 1972 the River Fergus has run above its usual top on 1,090 days, most of them in the winters of 2015–16 and 2013–14.

Measured by its highest day, last winter (2025–26) was the 24th-highest of the 48 on record here.

Source: OPW Hydro-Data (waterlevel.ie/hydro-data), Corrofin gauge (station 27003): 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.

Warnings

Weather and flood warnings for Corofin

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; Corofin is covered by County Clare’s.

WarningWhat Met Éireann means by it
YellowWeather that isn’t unusual but can be dangerous in places: be aware.
OrangeInfrequent, dangerous weather that can put people and property at risk: be prepared.
RedRare, 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 Corofin can’t be counted here.

Met Éireann warnings · OPW river levels (waterlevel.ie)

Flood scheme

No OPW flood relief scheme protects Corofin

The Office of Public Works’ completed flood relief schemes and the areas each one benefits (OPW open data, CC BY 4.0).

Schemes
0
protect homes in Corofin
Protected places in the county
1
Ennis
Nearest protected place
13 km
Ennis, as the crow flies
Low-lying homes
Not measured
the share a scheme would be built for

None of the OPW’s completed flood relief schemes has a benefiting area that takes in Corofin’s homes. The OPW builds schemes where the risk to homes is greatest, so most towns have none.

In County Clare, an OPW scheme also protects part of Ennis.

The protected places nearest here
TownSchemeDesigned forHomes behind itAway
Ennis ClareEnnis (Upper) Flood Relief Scheme1 in 1003.5%13 km
Gort GalwayGort River (Bridge Street) Drainage Scheme1 in 1000.9%21 km
Baile Chláir GalwayClare River (Claregalway) Flood Relief Scheme1 in 1007.9%45 km
Annacotty LimerickMulkear River (Ballymackeogh) Flood Relief Scheme1 in 101.1%47 km
Ballinasloe GalwayBallinasloe (Derrymullen) Flood Relief Scheme1 in 1003.2%70 km
Mallow CorkMallow South & West Flood Relief Scheme1 in 1002.6%95 km

Official flood maps and past floods: floodinfo.ie

Landslides

0.6% of Corofin’s homes stand 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

CorofinCounty Clare’s medianmedian of Irish towns
High or moderately high0.6%
0%5%

That is a higher share than in 85% of Irish towns; the median is 0% for County Clare’s towns and 0% for Irish towns.

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).

Radon

An estimated 28% of Corofin’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.

1% of homes estimated above the reference level · Under 1% of homesunder 0.1% of homes estimated above the reference level · Under 1% of homes12% of homes estimated above the reference level · 10–20% (High Radon Area)3.3% of homes estimated above the reference level · 1–5% of homes28% of homes estimated above the reference level · Over 20% (High Radon Area)42% of homes estimated above the reference level · Over 20% (High Radon Area)19% of homes estimated above the reference level · 10–20% (High Radon Area)28% of homes estimated above the reference level · Over 20% (High Radon Area)23% of homes estimated above the reference level · Over 20% (High Radon Area)26% of homes estimated above the reference level · Over 20% (High Radon Area)4.9% of homes estimated above the reference level · 1–5% of homes13% of homes estimated above the reference level · 10–20% (High Radon Area)5% of homes estimated above the reference level · 1–5% of homes© OpenStreetMap contributors · EPA
Under 1% of homes1–5% of homes10–20% (High Radon Area)Over 20% (High Radon Area)
Share of Irish towns in each band
Under 1% of homes17%
1–5% of homes38%
5–10% of homes26%
10–20% (High Radon Area)11%
Over 20% (High Radon Area) · Corofin9%

A square where 10% or more of homes are estimated above the reference level is a High Radon Area; 100% of Corofin’s homes are in one. The map is an estimate by area: two neighbouring houses can differ a lot.

100%
of homes in a High Radon Area
7.4%
County Clare’s median
4%
median of Irish towns

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).

Industrial sites

No EPA-licensed site within 5 km of Corofin: the nearest is 5.8 km away

Factories, farms, power plants and waste sites that hold an EPA licence for their emissions, in Corofin and around its centre.

0
licensed sites inside Corofin
0
licensed sites within 5 km of the centre
5.8 km
to the nearest: Clogrennane Lime Limited (Toonagh Quarry)
The nearest licensed site
SiteLicence and activityAway
Clogrennane Lime Limited (Toonagh Quarry)Industrial Emissions licence · cement and lime5.8 km

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.

Neighbours

Hazards in the places around Corofin

Low-lying homes, radon and landslide ground, town by town.

EnnisEnnistimonLehinchEnnisEnnistimonLehinchCorofin
TownLow-lyingRadonLandslides
Corofin–28%0.6%
Ennis
27,923 · 13 km		44%28%0%
Ennistimon
1,137 · 15 km		–under 0.1%3.1%
Lehinch
1,018 · 19 km		–under 0.1%0%

Of the places around Corofin, Ennis has the most homes standing low by big water (44%), 13 km away.

A dash under Low-lying: not measured there (too few homes with detailed ground heights), not none.

Be ready

Get ready for what Corofin faces

What to do, and what to ask before you move.

When the river rises
  • 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.
Met Éireann warnings · floodinfo.ie
Radon
  • 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.
radon.ie
When a storm is forecast
  • 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.
ESB Networks PowerCheck
Before you buy or rent in Corofin
  • 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.
How to read these numbers

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 Corofin

Does Corofin flood?

For a single address, the OPW’s official flood maps and past floods are on floodinfo.ie.

Is radon a problem in Corofin?

The EPA’s map estimates that about 28% of homes around Corofin are above the radon reference level of 200 Bq/m³: a higher share than in 95% 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 Corofin at risk of landslides?

0.6% of Corofin’s homes stand on ground rated high or moderately high for landslides. Most slides happen on steep slopes and peat after heavy rain.

How does Corofin compare with the places around it?

Radon estimates around Corofin run from under 0.1% in Ennistimon to 28% in Ennis; Corofin’s own is 28%. Among the places measured in detail, Ennis has the largest share of homes standing low (44%).

Where is the nearest bathing water to Corofin?

Ballyallia Lake, Ennis, 10 km away, was rated excellent for the 2025 season; it is the only identified bathing water within 15 km.

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. 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).