My toilet water turned blue about a month ago out of nowhere. I have Not added any type of cleaner or anything to the toilet bowl. I have lived here for 2 years and it has never done this before

Is the water in the tank blue or just in the bowl? Does the water smell like anything? Back to you, Tom

Do you live alone?

The water in the tank is blue also and it doesn't have any kind of odor. My wife says she didn't put anything in it either

Lift off the lid, flush the toilet. What color is the water entering the tank, pull out the refill tube and let it fill a glass, is it clear?

It sure sounds like someone dropped a tablet of blue bowl cleaner in your tank. Look on the bottom for a blur blob. Any practical jokers around your place? In the meantime I'm sure it will clear up in time. Some people put out money to have blue water in their bowl . Cheers, Tom

I agree with Tom. Somebody had to put something in the toilet tank to make it blue. Do you have kids, or maybe a house cleaning person? Get on in there and see what is in the tank that is causing the blue water, or if it doesn't stink, let it be, as Tom said, it will clear up over time, maybe like a hundred flushes if the advertising is correct;)