That test is from the actual tap water? Not the water from your tank?
Your tank is cycling now (fish in or no fish???) or you already have a tank running with fish in it?
How long?
Don't drink it!
Well it seems if that is tap water, and you already have fish, you might want to consider setting up a container and letting the water age, and treat with Prime rid it of ammonia. Then add to water for pwc to tank, some would just add Prime to the tap water and it will work for 24 hours.
Side note- If your water company uses Chloramines then you will need to make sure that you dose for that, about 2x as much as normal for Chlorine. Not all brands of dechlorinator can knock down chloramines.
So you can add additional media, ceramic rings or pellets, black stars or filter padding. I also like Seachem Matrix which has lots of surface area for building a strong colony of BB.
You can always use RO/DI water and remineralize it.
Maybe check with the Water supplier and see if that is always high like that.