When a HARMLESS chemical must be restricted (?)

PFAS chemicals are routinesly referred to as "Forever" chemicals but few people think about what that means. It means that they do not break down into other chemicals. They are the FINAL result of certain chemical reactions. They can break down no further. They are exeptionally inert.

But if they are inert can they be harmful? If something is inert it cannot interact with anything else in any way. It is harmless. It can do nothing. The fact that it is inert means that it is exceptionally SAFE. To be harmful it has to interact with something else in the body to produce a new chemical that is harmful to us. But it interacts with NOTHING. All it does is just sit there unchanging. The fact that it just sits there forever is what freaks people. But what harm does it do just sitting there? The fact that we all seem to have lots of it in us suggests that its just sitting there does no harm.

Researchers have often "Linked" PFAS to some ailment but what they say is the only link involved. The "link" is a verbal claim, nothing else

See for instance

https://www.abc.net.au/news/2021-12-10/pfas-study-katherine-williamtown-oakey-finds-no-cancer-link/100690484

And

https://australian-politics.blogspot.com/2023/06/more-pfas-excitement-ever-since-erin.html

I have repeatedy looked at the studies that claim to show harm but the studies concerned are very frail evidence of anything -- consisting of extreme tertiles, for instance. And even then the hazard ratios are always close to 1.0, meaning that there is actually nothing going on. The studies are in other words really evidence of no effect from PFAS, which is what we would expect of an inert substance. PFAS chemicals are just an unusually harmless form of dust, in short. They are of no concern. "Forever" necessarily means "harmless"


A dam has been shut down after being identified as the source of so-called 'forever chemicals' which have contaminated the water supply of 41,000 Sydney residents.

WaterNSW on Wednesday revealed the presence of the per- and polyfluoroalkyl substances (PFAS) in the Blue Mountains water supply came from Medlow Dam at Medlow Bath, west of Sydney.

In 2023, the World Health Organization declared perfluorooctanoic acid (PFOA), which is one of the roughly 14,000 known variants of PFAS, to be a class one human carcinogen.

PFOA was one of the forever chemicals detected in Medlow Dam.

'This dam does not supply raw water directly, but as a precautionary measure has been disconnected from supply while further investigations are conducted,' a WaterNSW statement read.

Water from Medlow Dam joins water from other sources in supplying the Cascade water filtration plant.

A WaterNSW spokesperson told the Sydney Morning Herald that the water supplied from the Cascade plant to local communities is safe to consume and meets Australian drinking water guidelines.

But the amount of PFAS allowed in drinking water are the subject of new limits in the US, where the laws are far more restrictive than in Australia.

Earlier this month, a senior policy advisor for the International Pollutants Elimination Network claimed that Australia is falling behind other countries rgearding drinking water safety.

'Australia cannot continue to use drinking water guidelines that are an international embarrassment,' Dr Mariann Lloyd-Smith told ABC's Radio National.

'Australian standards … are out of date, out of touch and totally are not usable for protecting human health. We really do need to move on these chemicals quickly.

'And particularly when it's in drinking water, something that everybody has to consume. It just is totally unacceptable.'

WaterNSW has been working for months to find the source of elevated PFAS levels in the Cascade filtration plant, which provides drinking water to the millions of people who visit the world heritage area every year, as well as Blue Mountains locals.

The levels found in the plant were about 300 times higher than that of Warragamba Dam - Sydney's main drinking water source.

The sampling results released on Wednesday showed the contaminants' source is probably high levels of PFAS in Medlow Dam, which exceeded national safety standards.

WaterNSW said all dams will be monitored and that preliminary sampling indicated Medlow Dam is the only one in its network with elevated readings.

'WaterNSW will keep the community informed as the investigation progresses and work closely with NSW Health and Sydney Water to ensure drinking water remains safe,' the statement added.

In Australia, PFAS chemicals have been used widely in firefighting foam in Defence Force bases due to their resistance to heat and flames.

Developed in the 1940s and 1950s, the chemicals are also known for their resistance to water and stains and are used in products such as rain coats and non-stick frying pans.

Dr Nick Chartres, of the University of Sydney's medicine and health faculty, said they are 'the most mobile, persistent and toxic chemicals in the world'.

'We know that they can get into the Arctic ice caps, they can get into the ice in Antarctica, they get into the deep-sea floor soil sediment. They basically travel everywhere,' he said.

PFAS' in drinking water led to the new, stricter regulations in the US.

Most Australians are likely to already have very low levels of PFAS in their bodies from using sunscreen and cosmetics.

But prolonged exposure, which could happen through drinking contaminated water over a long period, can lead to immune and heart problems, and can also affect fetal and infant growth.

Dr Chartres said the US Environmental Protection Agency found 'based on the best available evidence that we have … there is actually no safe level (of exposure to PFAS)'.

'So if you get exposed across a lifetime, at any level, your risk of these diseases starts going up incrementally based on the level of exposure.'

He said that the US law change should be a wake-up call for Australia.

'We now have to look to that and say, how do our standards (compare)? … And if there's any type of divergence with the Australian (laws), why is there a divergence?'

In the US, the maximum level allowed for PFOA and another variant, perfluorooctane sulfonate (PFOS), in drinking water is four parts per trillion.

But in Australia, PFOS and perfluorohexanesulfonic acid (PFHxS) - yet another PFAS variant - are allowed up to a level of 70 parts per trillion.

PFOS and PFHxS were both also found in Medlow Dam.

Dr Lloyd-Smith cautioned against buying bottled water to use instead of tap water, though.

'We've found PFAS in bottled water too, so that's not the solution,' she said.

Filtration systems can lower PFAS levels in drinking water, but they are expensive and unaffordable for many people.

https://www.dailymail.co.uk/news/article-13788153/Sydney-dam-closed-cancer-forever-chemicals.html