Help interpreting water report

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They don't tell you the pH, which would be helpful to know. You can buy pH test paper or a meter, or liquid test kits at an aquarium shop or swimming pool supply.

Orchids mostly prefer pH somewhere around 6.5-7 and many municipal water facilities are closer to 8. Fertilizer intended for use with pure water has chemicals to provide the proper pH when used with pure water; fertilizer intended for use with well or harder tap water also has chemicals to lower the pH, but in greater quantity than in fertilizer for pure water. If well water fertilizer is mixed with pure water the pH may be too low. So it would be good for you to know your water pH. They may be able to tell you if you contact them.

Your supplier gets water from several different sources and may mix it, so the water may vary some day to day.