Well, it would be good to know what kind of streaks these are. Are they on the emulsion? Are they on the base? Are they steaks of varying contrast? Are the streaks lengthwise, or from side-to-side? ("Vertical" doesn't describe too much to me, sorry) Is this 35mm film, with the problem highly evident around the sprocket holes?(posted 9469 days ago)The reason I ask is because there are many different factors which will cause film to streak.
I have heard that there can be streaks caused by development "surges" as developer is poured into a daylight tank. (These streaks have never happened to me.) Prewetting would cure this. The only other way to get rid of this kind of streak is to fill the tank with developer first, and then quickly put in the film.
I have seen streaks on Agfa APX 25 caused by bad drying. It looks like a long line, or series of tiny pockmarks in the emulsion. Once those are in there, that's it, the film is permanently damaged. (caused by pro lab) If this seems evident on the film surface, you should try a drying agent, such as Kodak Photo Flo or Edwal LFN (with distilled water). One person around here espouses using just distilled water in the final wash.
I use filtered water for all of my processing. I have a small Pur filter mounted on my faucet. While using filtered or distilled water can be a good idea, I'm not sure that plain tap water would cause a streaking problem. Usually the problem with tap water is when it is way out of PH balance or very heavy or very light in mineral content. Then you will see a development problem.
Hope something here helps.