A problem has developed in my house the past month or so and I was wondering if someone can offer an explanation. Whenever a toilet is flushed or a tap turned off a high pitch hum usually occurs permeating the house. The hum can last for 20 seconds sometimes. For the musically inclined the hum is around middle 'C'. The house has two stories with 3 toilets and is 14 years old. Any ideas what is causing this and how I can fix it?
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High pitch hum from plumbing after flush.