m0useanswered grow question a month ago most metropolitan areas use chloramine vs chlorine and boiling water does not get it out. You can break it down with a bit of vitamin C and then let it evaporate out, but again their is so little in the water it should not be affecting your plant this much. Well water does not normally have any.
just based on leaf colour It appears to be K or some micro nutrient related issue but I also feel watering habits and PH could be at play. Use a leaf chart and check your feeding regime. If you know you are giving adequate NPK then it could be a micro element or something else. With no diary its all a guess.
https://420life.com/wp-content/uploads/2021/10/Marijuana-Leaf-Deficiency-Chart-scaled.jpg
Good Luck!