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‘It’s dying in front of our eyes’: how the UK’s largest lake became an ecological disaster

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Sunday, September 14, 2025

The bright, cheery signs dot the shoreline like epistles from another era, a time before the calamity.“Ballyronan marina is a picturesque boating and tourist facility on the shores of Lough Neagh,” says one. “Contours of its historical past embrace the virginal shoreline.”Another sign boasts that the “rich ecological diversity and abundance of salmon and eels” has sustained communities there for thousands of years, since the stone age.A roadside billboard declares the Lough Neagh Fishermen’s Cooperative Society to be Europe’s biggest producer of wild eels. Yet another sign tells visitors that this majestic landscape of water and sky inspired Seamus Heaney’s Nobel-winning poetry.People feed ducks and sea gulls on the algae-covered shores of the lake. Photograph: Paul Faith/AFP/Getty ImagesBeauty, ecology, heritage, tourism, fishing – the UK’s biggest lake, sitting in the heart of Northern Ireland, had bragging rights to fill a hundred signs. But now they line the shoreline as testaments to hubris because of an environmental disaster.The 400 sq km (150 sq mile) freshwater lough is choking on recurring toxic algal blooms that coat the surface, kill wildlife, unleash stenches and make the lake all but unusable. Eel fishing has been suspended and tourists have fled.The lough and surrounding watercourses are on course to record their worst year, with at least 171 detections of cyanobacteria (blue-green algae) growths, according to a government pollution tracker. The algae’s return was a “distressing but timely reminder of the need to urgently turn the tide on the ecological crisis”, Northern Ireland’s environment minister, Andrew Muir, said in a statement.The algae on Lough Neagh forms patterns and swirls said to be reminiscent of works by Gustav Klimt. Photograph: Paul Faith/AFP/Getty ImagesThe main cause is an overload of phosphorus and nitrogen from agriculture, including farm runoff, fertilisers and animal waste. Inadequate wastewater treatment facilities and septic tank leakage aggravate the problems. Additional factors are sand extraction, warming water and proliferating zebra mussels, an invasive species.The Stormont executive agreed a rescue plan last year but has balked at reining in polluters, prompting condemnation from Claire Hanna, leader of the Social Democratic and Labour party: “Lough Neagh is dying in front of our eyes. Images of fish and eels gasping for life on the surface are not just shocking – they are a stark warning of total ecological collapse.”This week an activist, Bea Shrewsbury, attempted to present a “Lough Neagh smoothie”, drawn from the lake, to assembly members at Stormont. Police escorted her away.The lough supplies 40% of Northern Ireland’s drinking water, which is treated and said to be safe. Not everyone is convinced. “I’ve not drunk from the tap in a year,” said Brigid Laverty, 67, who lives by the lake. This week the Food Standards Agency said toxins have been found in the flesh of some fish for the first time but that commercially harvested fish remained safe to eat.A sign by Lough Neagh extols the lake’s history and ecology. Photograph: Rory Carroll/The GuardianThe water should be light brown but has turned green, said Peter Harper, an environmental officer with the Lough Neagh Partnership, a nonprofit group. In some places the sludge – so widespread it is visible from space – forms mosaic-type patterns and swirls redolent of Gustav Klimt, said Harper. “It can be weirdly beautiful.”The impact on wildlife is incalculable, making the tourism-themed shoreline signs a grim joke. “What lies beneath?” says one. “A world of ancient history and astounding myths is waiting just below the surface. What unique creatures have made the lough their home?”skip past newsletter promotionThe planet's most important stories. Get all the week's environment news - the good, the bad and the essentialPrivacy Notice: Newsletters may contain information about charities, online ads, and content funded by outside parties. If you do not have an account, we will create a guest account for you on theguardian.com to send you this newsletter. You can complete full registration at any time. For more information about how we use your data see our Privacy Policy. We use Google reCaptcha to protect our website and the Google Privacy Policy and Terms of Service apply.after newsletter promotionAnother sign exhorts visitors: “This special place deserves respect … please keep dogs on leads.” It urges swimmers to be careful because conditions can change fast. But there are no swimmers, and virtually no boats, because there is no demand and algae clogs engines.A buildup of algae at Toome lock at the north end of Lough Neagh. Photograph: Rory Carroll/The GuardianA more recent sign, tacked to a lamp-post at Ballyronan marina, is more up to date: “Spotted a dead wild bird? Use the DAERA dead wild bird reporting tool service if you find dead gulls, waders, ducks or swans.”DAERA is the department of agriculture, environment and rural affairs – a bureaucracy that critics say prioritised the farms and agrifood companies that expanded pig, chicken and cattle numbers in the past decade and overloaded the soil’s ability to absorb nutrients. They did so with official blessing in a “going for growth” strategy.“It was not thought through,” said Gerry Darby, the manager of the Lough Neagh Partnership. “I’ll put it another way. The guy who did the calculations about nutrient levels knew fuck all about fuck all.”Gerry Darby of the Lough Neagh Partnership. He said the lake could die unless action is taken to clean it up. Photograph: Rory Carroll/The GuardianMuir, of the Alliance party, said his department had completed or made good progress on most of the 37 points in an action plan agreed last year, but said Stormont faced “difficult decisions” over key measures. Sinn Féin and the Democratic Unionist party, who dominate the executive, appear to have stalled the nutrients action programme over fears of a farmer backlash.Darby said there was no magical solution, only trade-offs, but still expressed confidence that politicians would take the necessary measures. “The lake is not dead,” he said. “It could be dead if things continue as they are.”

Signs tout a natural paradise, but pollution from over-farming has left Northern Ireland’s Lough Neagh choked by toxic algaeThe bright, cheery signs dot the shoreline like epistles from another era, a time before the calamity.“Ballyronan marina is a picturesque boating and tourist facility on the shores of Lough Neagh,” says one. “Contours of its historical past embrace the virginal shoreline.” Continue reading...

The bright, cheery signs dot the shoreline like epistles from another era, a time before the calamity.

“Ballyronan marina is a picturesque boating and tourist facility on the shores of Lough Neagh,” says one. “Contours of its historical past embrace the virginal shoreline.”

Another sign boasts that the “rich ecological diversity and abundance of salmon and eels” has sustained communities there for thousands of years, since the stone age.

A roadside billboard declares the Lough Neagh Fishermen’s Cooperative Society to be Europe’s biggest producer of wild eels. Yet another sign tells visitors that this majestic landscape of water and sky inspired Seamus Heaney’s Nobel-winning poetry.

People feed ducks and sea gulls on the algae-covered shores of the lake. Photograph: Paul Faith/AFP/Getty Images

Beauty, ecology, heritage, tourism, fishing – the UK’s biggest lake, sitting in the heart of Northern Ireland, had bragging rights to fill a hundred signs. But now they line the shoreline as testaments to hubris because of an environmental disaster.

The 400 sq km (150 sq mile) freshwater lough is choking on recurring toxic algal blooms that coat the surface, kill wildlife, unleash stenches and make the lake all but unusable. Eel fishing has been suspended and tourists have fled.

The lough and surrounding watercourses are on course to record their worst year, with at least 171 detections of cyanobacteria (blue-green algae) growths, according to a government pollution tracker. The algae’s return was a “distressing but timely reminder of the need to urgently turn the tide on the ecological crisis”, Northern Ireland’s environment minister, Andrew Muir, said in a statement.

The algae on Lough Neagh forms patterns and swirls said to be reminiscent of works by Gustav Klimt. Photograph: Paul Faith/AFP/Getty Images

The main cause is an overload of phosphorus and nitrogen from agriculture, including farm runoff, fertilisers and animal waste. Inadequate wastewater treatment facilities and septic tank leakage aggravate the problems. Additional factors are sand extraction, warming water and proliferating zebra mussels, an invasive species.

The Stormont executive agreed a rescue plan last year but has balked at reining in polluters, prompting condemnation from Claire Hanna, leader of the Social Democratic and Labour party: “Lough Neagh is dying in front of our eyes. Images of fish and eels gasping for life on the surface are not just shocking – they are a stark warning of total ecological collapse.”

This week an activist, Bea Shrewsbury, attempted to present a “Lough Neagh smoothie”, drawn from the lake, to assembly members at Stormont. Police escorted her away.

The lough supplies 40% of Northern Ireland’s drinking water, which is treated and said to be safe. Not everyone is convinced. “I’ve not drunk from the tap in a year,” said Brigid Laverty, 67, who lives by the lake. This week the Food Standards Agency said toxins have been found in the flesh of some fish for the first time but that commercially harvested fish remained safe to eat.

A sign by Lough Neagh extols the lake’s history and ecology. Photograph: Rory Carroll/The Guardian

The water should be light brown but has turned green, said Peter Harper, an environmental officer with the Lough Neagh Partnership, a nonprofit group. In some places the sludge – so widespread it is visible from space – forms mosaic-type patterns and swirls redolent of Gustav Klimt, said Harper. “It can be weirdly beautiful.”

The impact on wildlife is incalculable, making the tourism-themed shoreline signs a grim joke. “What lies beneath?” says one. “A world of ancient history and astounding myths is waiting just below the surface. What unique creatures have made the lough their home?”

skip past newsletter promotion

after newsletter promotion

Another sign exhorts visitors: “This special place deserves respect … please keep dogs on leads.” It urges swimmers to be careful because conditions can change fast. But there are no swimmers, and virtually no boats, because there is no demand and algae clogs engines.

A buildup of algae at Toome lock at the north end of Lough Neagh. Photograph: Rory Carroll/The Guardian

A more recent sign, tacked to a lamp-post at Ballyronan marina, is more up to date: “Spotted a dead wild bird? Use the DAERA dead wild bird reporting tool service if you find dead gulls, waders, ducks or swans.”

DAERA is the department of agriculture, environment and rural affairs – a bureaucracy that critics say prioritised the farms and agrifood companies that expanded pig, chicken and cattle numbers in the past decade and overloaded the soil’s ability to absorb nutrients. They did so with official blessing in a “going for growth” strategy.

“It was not thought through,” said Gerry Darby, the manager of the Lough Neagh Partnership. “I’ll put it another way. The guy who did the calculations about nutrient levels knew fuck all about fuck all.”

Gerry Darby of the Lough Neagh Partnership. He said the lake could die unless action is taken to clean it up. Photograph: Rory Carroll/The Guardian

Muir, of the Alliance party, said his department had completed or made good progress on most of the 37 points in an action plan agreed last year, but said Stormont faced “difficult decisions” over key measures. Sinn Féin and the Democratic Unionist party, who dominate the executive, appear to have stalled the nutrients action programme over fears of a farmer backlash.

Darby said there was no magical solution, only trade-offs, but still expressed confidence that politicians would take the necessary measures. “The lake is not dead,” he said. “It could be dead if things continue as they are.”

Read the full story here.
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Lawsuit says PGE, Tillamook Creamery add to nitrate pollution in eastern Oregon

The lawsuit, filed on behalf of residents in Morrow and Umatilla counties, says nitrate pollution from a PGE power generation plant and from a Tillamook cheese production facility has seeped into groundwater, affecting thousands of residents in the area.

A new lawsuit claims Portland General Electric and the Tillamook County Creamery Association contribute significantly to the nitrate pollution that has plagued eastern Oregon for over three decades. The lawsuit, filed on behalf of residents in Morrow and Umatilla counties, says nitrate pollution has seeped into groundwater, affecting thousands of residents in the area known as the Lower Umatilla Basin Groundwater Management Area who can’t use tap water from private wells at their homes.PGE operates a power generation plant at the Port of Morrow in Boardman and the Tillamook County Creamery Association, a farmer-owned cooperative known for the Tillamook Creamery at the coast, operates a cheese production plant in Boardman. The two plants send their wastewater to the port, which then sprays it through irrigation systems directly onto land in Morrow and Umatilla counties, according to the complaint filed Friday in the U.S. District Court in Oregon.PGE and Tillamook transfer their wastewater to the port despite knowing that the port doesn’t remove the nitrates before applying the water onto fields, the suit contends.PGE’s spokesperson Drew Hanson said the company would not provide comment on pending legal matters. Tillamook Creamery did not respond to a request for comment.The new complaint follows a 2024 lawsuit by several Boardman residents that accused the Port of Morrow, along with several farms and food processors of contaminating the basin’s groundwater. The others named are: Lamb Weston, Madison Ranches, Threemile Canyon Farms and Beef Northwest.A state analysis released earlier this year shows nitrate pollution has worsened significantly in eastern Oregon over the past decade. Much of the nitrate contamination in the region comes from farm fertilizer, animal manure and wastewater that are constantly and abundantly applied to farm fields by the owners of food processing facilities, confined animal feeding operations, irrigated farmland and animal feedlots, according to the analysis by the state and local nonprofits. Those polluters are also the main employers in eastern Oregon. Steve Berman, the attorney in the newest case, said PGE and the farmer cooperative were not included in the previous lawsuit because their impact wasn’t previously clear. “We keep drilling down into new records we are obtaining from the regulatory authorities and activists and analyzing how groundwater moves in the area. Our experts now tell us these two entities are contributing as well,” Berman said. According to the complaint, PGE’s power generation plant at the Port of Morrow, called Coyote Springs, generates an estimated 900 million gallons of nitrate-laced wastewater each year from a combination of cooling tower wastewater, wash water and the water discharged from boilers to remove built-up impurities.From 2019 to 2022, PGE’s wastewater had an average nitrate concentration of 38.9 milligrams per liter – almost four times higher than the Environmental Protection Agency’s maximum contaminant level, the complaint claims. PGE’s plant is not producing nitrates, Berman said, but rather is using groundwater with pre-existing nitrates and then concentrating the chemicals through its industrial processes. PGE’s plant is not producing nitrates, Berman said, but rather is using groundwater with pre-existing nitrates and then concentrating the chemicals through its industrial processes. and then spread pre-existing nitrates from groundwater and don’t add their own but concentrate the nitrates through their industrial processes, such as xxx.Columbia River Processing, the Tillamook Creamery Association’s cheese production plant, generates an estimated 360 gallons of wastewater each year from a combination of cheese byproducts and tank wash water, according to the complaint. From 2019 to 2022, Tillamook’s wastewater had an average nitrate concentration of 24 milligrams per liter – more than twice the EPA’s maximum contaminant level, the complaint claims. In addition, the association also sources its milk from Threemile Canyon Farms, a “megadairy” in Boardman that houses 70,000 cows and was named in the previous nitrate lawsuit. The dairy constantly applies high-nitrogen waste from its operation to its farmland, the earlier suit says. The lawsuit seeks to force remediation or halt the practices. It also demands that the companies cover the costs of drilling deeper wells for private well users who currently face nitrate contamination – an estimated $40,000 cost per well – as well as the costs of connecting households to municipal water systems and compensation for higher water bills paid by residents due to nitrate treatment in public systems. People who can’t use their contaminated tap water now must rely on bottled water for cooking, bathing and other needs. While there are plans to extend municipal water service to some of those homes, many residents oppose the idea because they’ve invested heavily in their wells and fear paying steep water rates.Critics say state agencies have not done enough to crack down on the pollution, with much of the focus on voluntary measures that have failed to rein in the nitrate contamination.Research has linked high nitrate consumption over long periods to cancers, miscarriages, as well as thyroid issues. It is especially dangerous to infants who can quickly develop “blue baby syndrome,” a fatal illness.

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