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Wa ʿalaykum al-salām wa raḥmatullāhi wa barakātuh.

All praise is due to Allah, and may His blessings and peace be upon His Messenger ﷺ, his family, and his Companions.

May Allah ease your distress and grant you peace of mind. Based on what you have described, treat the tap and tank water as pure and suitable for purification. These doubts should not prevent you from praying.

Islam provides a reassuring principle:

اليقين لا يزول بالشك
“Certainty is not removed by doubt.”

When the Prophet ﷺ was asked about someone who imagined that he had passed wind during prayer, he instructed him not to leave unless he heard a sound or noticed a smell. The point is that established purity is not lost through mere suspicion. (Ṣaḥīḥ Muslim, no. 361.)

Imām al-Nawawī explains that this hadith establishes a fundamental principle: things retain their original ruling until the contrary is established with certainty; subsequent doubts do not change that ruling. (Sharḥ Ṣaḥīḥ Muslim, commentary on the hadith concerning doubt about breaking wuḍūʾ.)

In your case, neither contamination of your hands nor contamination of the water supply has been established. The thought that splashed water travelled from the outside of the tap fitting back into the overhead tank is a remote, unsupported possibility. Ordinary splashing onto a properly fitted tap is not a reason to believe that the water supply has become contaminated. You do not need to inspect the fittings, trace the splashes, wash the tap again, or empty the tank.

There is also a relevant clarification according to the Shāfiʿī school: human semen (manī) is itself pure, although its discharge requires ghusl. Therefore, contact with semen itself would not make the water mutanajjis (impure). Furthermore, even when an actually impure substance enters water, water amounting to two qullahs or more does not become impure merely through contact with it, unless that impurity changes its colour, taste or smell. This explains the ruling; it is not a reason for you to measure the tank or examine its water, since contamination has not been established in the first place.

Since you describe an actual discharge following a wet dream, you need to perform the required ghusl before praying. The Prophet ﷺ instructed that ghusl is required following a wet dream when discharge is found. (Ṣaḥīḥ al-Bukhārī, no. 282.) 

When waswas distracts you, seek Allah’s protection and gently return your attention to worship. ʿUthmān ibn Abī al-ʿĀṣ رضي الله عنه complained to the Prophet ﷺ that Satan was disrupting his prayer and recitation. The Prophet ﷺ identified this devil as Khinzab and instructed him to seek refuge in Allah and spit lightly to his left three times. ʿUthmān reported that he followed this guidance and Allah relieved him of the disturbance. (Ṣaḥīḥ Muslim, no. 2203.)

You may say:

أَعُوذُ بِاللَّهِ مِنَ الشَّيْطَانِ الرَّجِيمِ

“I seek refuge in Allah from the accursed Satan.”

If these recurring thoughts are causing distress and interfering with prayer, please also speak with a trusted scholar and a qualified mental-health professional familiar with intrusive thoughts. Seeking support is compatible with faith and can help you manage this difficulty.

May Allah grant you ease, tranquillity and confidence in your worship.

Allah knows best.