Is it permissible to perform ablution with tap water if it is contaminated with very small quantities of pork, given that the water's properties have not changed?

Firstly, the faucet being contaminated with pig impurity is often a delusion, and the affected person should dismiss it from their mind and increase their remembrance of Allah. It is recommended to consult a specialist doctor for the treatment of obsessive-compulsive disorder.

Secondly, if an impurity is assumed to be present in the water tank (pig or otherwise), and the water has not changed due to it, the water remains pure and may be drunk, used, and used for ablution, due to the saying of the Prophet, peace and blessings be upon him: "Water is pure; nothing makes it impure."