Potability of your drinking water is whether it is drinkable or not without fee of becoming sick due to e-coli or bacteria. Nova Scotia has a handy tool that can read your test results by merely entering the findings of your lab reports. Click the photo or HERE to interact with it.
Potability does not mean metals or other chemicals are not present. Labs offer several levels of testing from the e-coli/bacteria testing to a full range of all the metals. Prices can range from $35 to $200+.  I recommend a full suite so you can have a benchmark on how your water changes over the years.