Workers on an oil platform were told to only drink bottled water after the water supply became contaminated.
The alarm was raised after workers smelled diesel while having a shower.
The incident happened on BP’s Magnus platform, about 16km (10 miles) north-east of Shetland.
BP said very low level contamination was detected but not enough to be a danger to health.
It added that it was confident the issue had now been resolved.
Further tests are being carried out as a precaution.
In a statement, BP said: "Following reports of possible contamination of the water supply on the Magnus platform bottled water was distributed and restrictions were placed on the use of the platform’s potable water supply.
"Sampling of the supply showed there was some contamination at very low levels, far below that which may cause health issues.
"We have since flushed our potable water tanks and are confident that the contamination is no longer present.
We are carrying out further tests of the supply as a precautionary measure and investigating the source of the contamination."

It’s likely both numbers could be higher because they don’t reflect other suspected but unconfirmed cases in remote areas.
Utuado resident Wilfredo Cosme de Jesus and his wife Maria Rodriguez Rivera wash their clothes on the side of the highway in Utuado.
Two weeks after the hurricane, Gambo Rodríguez’s stepfather started vomiting and came down with a fever.
David Santiago dsantiago@miamiherald.com But a week after he was released from the hospital, Cosme de Jesús was bathing and helping his wife wash clothes on the side of the road.
Andrea Chaves Arana, a water, hygiene and sanitation expert working for Oxfam, pictured outside the local emergency operations center in Humacao, Puerto Rico.
Chaves Arana was assessing the need for water filtration systems in the surrounding area.
But even those with running water are struggling to boil it, Chaves Arana said.
There’s also no definitive testing for leptospirosis available in Puerto Rico; in order to confirm cases, samples have to be sent to a Centers for Disease Control and Prevention laboratory in Atlanta.
David Santiago dsantiago@miamiherald.com Most patients don’t develop the more serious symptoms associated with the disease, Deseda said, but because leptospirosis can cause kidney or liver failure in some people, public health officials are advising doctors to immediately treat any suspected cases.
They were hoping to work with the CDC to confirm suspected cases in the future, but hadn’t yet been able to do so.

People living in the town of Vlaardingen, west of Rotterdam, have been told to boil their drinking water after water company Evides said it had found evidence of E. coli bacteria in samples taken from several different locations.
Locals have been told to boil drinking water for three minutes to make it safe, but there has been a run on bottled water at supermarkets, broadcaster RTL Nieuws reported.
‘We are bringing in massive deliveries because our clients have the right to clean water,’ supermarket manager Nico van der Elst told RTL.
In total, 70,000 people have been affected by the scare.
The problem is expected to last three days.
While most strains of E.coli, which is found in the intestines of people and animals, are harmless, some can cause diarrhea, urinary tract infections, respiratory problems and other illnesses.
Restaurants and cafes are also working hard to make sure they can still serve their customers.
‘We can’t use our normal coffee maker,’ Daan, from café De Hofnar said.
‘So our customers can’t have cappuccinos.
We’re improvising but there are worse problems in the world.’

The crisis in Flint, Mich., put a spotlight on the risks of lead in drinking water.
If the Buffalo Water Board or just about any other water provider in the country had tested these homes using the sampling method that is generally accepted by the EPA, only one of the 22 homes would have failed.
That’s because most water providers, like the Buffalo Water Board, collect only one liter of tap water to test for lead in a home.
Of the four homes that failed, three had the highest concentrations of lead in the second bottle, which means the faucet ran for at least a minute.
If the Buffalo Water Board had tested the tap water in that home, they would have reported the 1.6 parts per billion as the result.
Edwards said this means the testing method employed by the Buffalo Water Board and most other water providers can give false assurances that the water has insignificant concentrations of lead when the levels may in fact pose a risk.
OJ McFoy, the Buffalo Water Board chairman, said the city is preparing to launch a pilot program to collect more tap water from homes they test.
In addition, water providers and health officials often tell people who are concerned about lead in tap water to run the water between 30 seconds and two minutes before using it for cooking or drinking.
“If you want to avoid that, you have to flush it at least two minutes.” McFoy said the city’s annual water quality reports follow EPA protocol with respect to the advice on flushing the water.
“We will take a look at it, but right now that’s what we have and we’re going to see if our empirical data shows different things.” If you are concerned about lead in drinking water, there is a relatively simple, cost-effective solution: use water filters certified by NSF to remove lead from tap water.

He and his 4-year-old brother, Josiah, have learned not to turn on the tap because the water coming out of the faucet is likely poisonous.
This is the way they’ve been living for the past three years, ever since their parents learned that the water in their hometown of Flint, Michigan water wasn’t safe.
“I’m definitely not going to take the chance on my children’s health and safety.” It was early in 2014 when Flint leaders, under emergency management due to bankruptcy, announced that to save money they were going to switch the source of water from Lake Huron, something they’d been getting through Detroit for the last 40 years, to a local source, the Flint River.
Days after the switch to the river was made, Bell McDonald could tell something wasn’t right.
Gen. Michael McDaniel, who was enlisted to manage Flint’s pipe replacement project.
He said the water treatment plant had been there for 50 years.
Now, 15 state and city leaders are facing criminal charges in connection to decisions made that led to the water crisis.
Class-action lawsuits have also been filed on behalf of residents who suffered from the water crisis.
Flint is no longer getting its water from the river.
Millions in federal and state dollars have been allocated for the crisis but after three years, Oliver said, “the one thing we don’t have a lot of is time.” “I don’t think anyone who’s living through this crisis is comfortable with the speed at which we’re moving from crisis to recovery,” he said.

SOUTHEASTERN NC (WWAY) — State officials have ordered Chemours to provide bottled water to 15 more well owners near the company’s Fayetteville facility after the most recent test results showed GenX above the provisional state health goal of 140 parts per trillion in their wells.
Fifty residential well owners living near Chemours’ Fayetteville Works facility are receiving bottled water because of GenX detections above the provisional drinking water health goal established by the state Department of Health and Human Services.
DEQ and Chemours have sampled 128 residential wells since testing near the facility began in September.
DEQ continues to send all well owners the results of well testing and health and other information based on the results.
DEQ will continue to receive and verify the results from Chemours’ sampling.
“Well water sampling will continue until we find where the contamination ends.
We will do spot checks to verify Chemours’ results, and notify well owners of results as we receive them,” said Secretary Regan.
DEQ is in discussions with Chemours about longer-term water solutions for residents with affected wells, most of whom live north of the facility.
Among the possibilities are installing home filter systems or connecting affected homes to an uncontaminated well source or a nearby public water supply.
The state is coordinating with Bladen and Cumberland counties about waterline placement.

State officials have directed Chemours to provide bottled water to 15 additional well owners near the company’s Fayetteville Works facility after recent tests revealed GenX levels that surpass the state’s health goal of 140 parts per trillion.
DEQ and Chemours have sampled 128 wells since testing near the Fayetteville Works site began in September.
DEQ continues to send all well owners the results of well testing and health and other information based on the results.
DEQ will continue to receive and verify the results from Chemours’ sampling.
“Well water sampling will continue until we find where the contamination ends.
We will do spot checks to verify Chemours’ results, and notify well owners of results as we receive them,” said Secretary Regan.
Among the possibilities are installing home filter systems or connecting affected homes to an uncontaminated well source or a nearby public water supply.
The state is coordinating with Bladen and Cumberland counties about waterline placement.
Copyright 2017 WECT.
All rights reserved.

Traces of GenX have been detected in a well that provides water to Gray’s Creek Elementary School.
[Andrew Craft/The Fayetteville Observer] Staff writer @WriterDeVane Traces of a potentially harmful compound were detected in a well that provides water for Gray’s Creek Elementary School, state officials said Thursday.
The interim superintendent said the Cumberland County Schools will continue to provide bottled water for Gray’s Creek and Alderman elementary schools.
No GenX was found in the water at Alderman, according to state officials.
GenX has been connected in studies to testicular, pancreatic and liver cancer in animals, but it is not known whether those effects are the same in humans.
Little is known about the compound and other compounds called “emerging contaminants.” The amount of GenX at the Gray’s Creek school — 5.19 parts per trillion — is well below the state’s provisional drinking water health goal of 140 parts per trillion, according to a statement released by the state Department of Environmental Quality.
“We felt the public would still be concerned.” Each day, Gray’s Creek elementary uses about 900 bottles of water and 30 gallons in the kitchen, school officials say.
Regan said state officials understand that the school system has to make decisions based on the health and well-being of its community.
The state started investigating GenX in June after news broke that a team of researchers discovered elevated levels of the chemical in the Cape Fear River downstream from the Chemours plant.
The chemical has since been discovered in private wells near the plant, which is off N.C. 87 in Bladen County near the Cumberland County line.

LOIZA, Puerto Rico — Massive damage to Puerto Rico’s water system from Hurricane Maria poses a looming health crisis for island residents exposed to contaminated water, health workers and environmentalists warn.
“The drinking water system in Puerto Rico was already very fragile,” Olson said.
Alicea said he is not worried about a health crisis because with each delivery, municipal workers emphasize the importance of drinking bottled water.
Iricelis Ortiz, 42, said municipal officials have yet to pass through her neighborhood, so residents organized a committee to ask the city for what they need.
Ortiz worries that the bad-tasting, blue-colored water that runs in her pipes is unsafe.
Bottled water can be hard to find and gets expensive, said her aunt, Maria Ortiz, 66.
“Over the past two weeks, we’ve seen a continuous stream of adult and pediatric patients with gastrointestinal illness, most often involving fever, vomiting and diarrhea,” said Christopher Tedeschi, an emergency medicine physician at New York-Presbyterian/Columbia University Medical Center, who returned Thursday from Puerto Rico.
Llamara Padró, a nurse at New York’s Upstate University Hospital, who volunteered with a group of 40 nurses organized by the American Federation of Teachers (AFT), said they treated people with gastrointestinal symptoms and conjunctivitis.
“It’s right now a public health crisis,” said Padró, whose group worked in more than a dozen communities across Puerto Rico.
Dorell reported from Washington More: Five weeks after Maria most of Puerto Rico remains an island in the dark More: Who will rebuild Puerto Rico as young professionals leave island after Hurricane Maria?

NEW YORK (Thomson Reuters Foundation) – Flint was drowning in empty bottles after a toxic water scandal became the latest crisis to hit the Michigan town – this week it fought back with a project that transforms its plastic waste into a hip new line of clothes.
The impoverished community of 100,000, once a thriving manufacturing behemoth, drew national attention in 2015 when research revealed residents were exposed to dangerously high levels of lead in their running water.
Bottled water became a safe alternative, alongside water filters.
The idea is as much about creating objects of beauty as about reviving some of Flint’s lost manufacturing luster, as chronicled by Michael Moore’s acclaimed movie “Roger & Me” about the shutdown of its local auto plants.
Flint has faced a run of crises, sinking deep into depression after its car industry shrank, becoming known for high crime rates, dangerous living and for its city falling into financial emergency.
The public health crisis created by the city’s tainted water affected thousands of residents, causing an outbreak of Legionnaires’ disease, and led to the unsightly bottle buildup.
“I said ‘How can something that is emblematic of a bad situation leave Flint and return as something that is about the principle of hope and regeneration?
(Courtesy Ben Premeaux) Inspiration came after the conceptual artist visited Flint last year, and found women stitching hospital scrubs and other garments on a basketball court, part of a community project.
Containers designed to collect empty water bottles as part of Flint Fit, an art project to recycle the bottles and transform them into a clothing line, are seen in this October 30th, 2017 photo.
The Flint Fit collection will premiere at the Queens Museum in New York City with a fashion show and exhibition, expected to take place next April, Chin said.