I have my own well, unfortunately with having your own well means you need to treat your own water.
Hard water is mineral deposits that will show itself in the form of calcium buildup (white) I use water boss water softener which is a 2 stage softener the first is a sand mixture to capture sediment before finally going through a softener ( 50 lbs salt pellets from Home Depot, lowes) I live on a mountain with no sewer mains. City water is treated with chlorine and the high levels of chlorine can kill a seed hence the use of distilled or purified water to germinate seeds and I've never lost a seed with 100% success rate, but everyone has their own methods and I'm not knocking anyone's method we're here to help you.
BTW ph levels range from 1-14, 7 being neutral below 7 acidity levels are greater and above 7 the alkalinity level rises I forgot the levels required for growing weed since I use amended soil and don't worry about ph levels I use a variation of coots and Supersoil (my buddy gave me 11 year old soil he amended)
B4L