Just two thoughts, most water reports reports Sulfate as Sulfate in Sulfur or SO4-S rather than as regular Sulfate or SO4, so you may want to ask your water department which they are reporting, as if it is S04-S than you need to multiply the 1.2 number by 3 for Bru'n Water.
The other issue is, just like with my town water, yours reports an average for various water tests, not an actual number at a set time. How much does the water fluctuate from those numbers during the course of the year is something you may want to ask the water department. The report is also 2 years old. Because my town reported averages, I sent a water sample to Ward Labs so I could get my current water numbers versus an average of tests over the course of the year. Will say the numbers were pretty similar though, I was hoping they were not as my town water has too much sodium and chloride in it.