I can't answer your question, but I think its interesting to note the difference in the data you just got and the data that Beersmith uses for Seattle water:
Name: Seattle, WA
PH: 7.8
Calcium: 17.0
Magnesium: 1.0
Sodium: 4.0
Sulfate: 2.0
Chloride: 4.0
Bicarbonate: 18.0
Notes: Seattle...