If some pork falls into water and none of its characteristics are changed
Question

                My question is this: if my tap water at home is contaminated with molecule amounts of amounts of pig is it still permisdible to do wudu with this water. Please note the characteristics does not change.
Praise be to Allah.
	Firstly:

	It is not clear to us how the tap water could be contaminated 
	with impurities of pork origin. What appears to be the case is that such a 
	thing cannot really happen; rather it is merely whispers from the Shaytaan 
	to which the questioner has fallen prey.

	What the one who is faced with such whispers must do is 
	ignore them and not give his mind free rein to follow them; he should 
	remember Allah, may He be exalted, a great deal, call upon Him and seek 
	refuge with Him from the accursed Shaytaan. If he continues to give free 
	rein to those whispers, the Shaytaan will gain power over him and will 
	corrupt all his affairs, and he will begin to doubt everything around him, 
	and will be in a state of constant anxiety, distress and confusion.

	Moreover, we also advise you most emphatically to go to a 
	trustworthy specialist doctor, for compulsive thoughts and whispers are a 
	sickness like any other, and needs medical pharmaceutical treatment as well 
	as behavioural therapy under the supervision of a trustworthy specialist.

	For more information, please see the answer to question no.
	62839

	Secondly: if we assume that what the questioner mentioned is 
	correct, and that there is some kind of impurity (from a pork source or 
	otherwise) that fell into a tank of water, but the water was not changed by 
	that impurity, then the water remains pure and it is permissible to drink 
	it, use it and do wudoo’ with it.

	The Messenger (blessings and peace of Allah be upon him) was 
	asked about doing wudoo’ with water from the well of Budaa‘ah even though 
	the flesh of dead dogs and other kinds of impurities and putrid things were 
	thrown into it, and he said: “Water is pure and is not rendered impure by 
	anything.” Narrated by an-Nasaa’i (326);classed as saheeh by al-Albaani in
	Saheeh al-Jaami‘ (1925).

	So long as the water has not been changed by the impurity, 
	then it remains pure.

	Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) 
	said: This wording is general in meaning and includes both small amounts and 
	large amounts; it is general in meaning and applies to all kinds of impurity 
	and contamination.

	End quote from Majmoo‘ al-Fataawa (21/33).

	Ibn al-Qayyim (may Allah have mercy on him) said in his 
	commentary on as-Sunan (1/83):

	The fact that he did wudoo’ from the well of Budaa‘ah, even 
	though its condition was as they said, indicates that water is not rendered 
	impure by impurity falling into it, so long as it does not change. End 
	quote.

	It says in Fataawa al-Lajnah ad-Daa’imah (vol. 1, 
	5/84):

	The basic principle with regard to water is that it is pure, 
	but if its colour, taste or odour is changed by some impurity, then it 
	becomes impure, regardless of whether it is a small or great amount. But if 
	the impurity does not change it, then it remains pure. End quote.

	For more information, please see the answer to question no.
	224923.

	And Allah knows best.