Is this incoming UK mains?
If you don't already have copies, get in touch with your water supplier as they should be able to share their own analytical results. In some regions these can be downloaded directly from their website by putting your postcode in.
Beyond that, presumably all you're trying to do is demonstrate that the water is potable in that it complies with the Water Supply (Water Quality) Regulations 2016, which IIRC only specifies Enteros and E. coli both as 0 per 100ml as the "absolute" micro parameters at the consumer end.
Additionally there are "indicator" parameters of: C. perfringens at 0 per 100ml, coliforms at 0 per 100ml, and colony count (at 22C) per ml of "no abnormal change".
Using this as the basis for your scope should more than suffice, IMO.
I wouldn't particularly expect to need to do any chemical analysis, particularly if you're obtaining the results for this from the water supplier. I have had to do some myself in some places, but that's been where the water is used as an ingredient and there are specific process-related implications for some chemicals that are expected to be present.