Tenant wants to test water for copper

[Vladimir Khorikov]

Hello everyone.

A tenant just moved in, says the water from the kitchen sink is blue and wants to test it for copper:

"My water from my kitchen sink was blue this morning when I went to rinse a glass. It’s not remaining blue, and

I am running the faucets."

They also attached the photos:

My property manager says they never encountered such requests and ask me what should they do.

What would you recommend? This is my first rental and I don't know how to handle this.

Thanks

Vlad