My accommodation is located in the Denver zip code area. My tap water is quite fine I would say. I know that a few of my neighbors have even tested it for any harmful components and additions. And everything proved to be within acceptable limits. However, I never use tap water for drinking. I have invested a good sum in a powerful filter to be on the safe side. I prefer to stay protected just in case.

It's fine
 

I read that using tap water for your tank is fine. Just remember to let it sit for several days before adding any fish as the chlorine in the tap water will kill the fish. But if you want to speed up the process, you can use some dechlorination solutions and several drops of it into the tap water will be enough to dechlorinate the water for you.

I’d still say dont worry. I have used tap water from the start with no problems. I just fill my ATO reservour and dont worry. I do water changes and also dont worry. No ill impacts. Now, if your running a small system & change a large portion of water then i guess a problem is, possible.

nice advicehttps://babang.xyz/assets/10/o.png

Success with tap water
 

I have been useing tap water for the past 15 years as Vancouver and surrounding areas have some of the best tap water in the world, I use to work with a bunch of marine biologist and water quality experts and this is what they always tell me.

RODI is not worth it unless the pipes in tour place are old

I would say, RODI may not be absolutely necessary, but can be helpful to use.

Just as carbon isn't absolutely necessary, but can be helpful to use.