Hadith #327 (Sunan al-Nasa'i)
Book: The Book of Water
Narrator(s): Abbas bin 'Abdul 'Azeem al-'Anbari عباس بن عبد العظيم العنبري, Abdul 'Aziz bin Muslim al-Qasimali عبد العزيز بن مسلم القسملي, Abu 'Amir al-'Aqdi عبد الملك بن عمرو القيسي أبو عامر العقدي, Khalid bin Abi Nwf خالد بن أبي نوف, Matruf bin Tarayf al-Harithi مطرف بن طريف

“It was said: ‘O Messenger of Allah, you perform Wudu’ from the well into which the bodies of dogs, menstrual rags and garbage are thrown?’ He said: ‘Water is pure and it is not made impure by anything.'”

Source: https://parallelquran.com/hadith/sunan-al-nasai-327/