Most turf grasses in the PNW will be blends of various cool weather grass seeds, however sod farms seem to prefer monocultures and often go with a single type. Because many of these grasses look virtually indistinguishable from each other, best to go back to the source and ask where you purchased the sod. Because our cool season grasses want to go dormant in summer, I tend to recommend fall as the best time to overseed or do much remedial lawn care. What you can do now is to aerate the soil, using a plug or core aerator. Aerating is one of the best things you can do for a lawn or the ideal first step in lawn care prep. After aerating, spread a thin layer of compost, just a half inch or so. Water as necessary but not too frequently and deeply when you do. In my Puget Sound climate, once every week to 10 days is usually sufficient through summer provided the water penetrates down 6-8 inches. Weed manually as required. Then in fall you can overseed. Again, cover with a thin layer of compost (better than peat or topsoil) and keep moist until full germination, usually about 10-14 days. Mow when the new grass is at least 2.5 inches tall. And you can still fertilize before winter. If you overseed in September, you should be able to fertilize in mid to late October. Of any time of year, the fall fertilizing is the most beneficial in our region. And opt for an organic product if you can.

I'm not very good at identifying grass, but it looks like a mixture of KBG and tall fescue. It also looks like you need to sharpen your blade. Some of the grass looks like it is shredding. Tall fescue is particularly sensitive to dull blades and can almost tear more than cut.

After looking at it, the blades seem a little finer than our Meyer Zoysia. It may be because we cut ours shorter. Common Bermuda maybe? Can you get a pic of the blades attached to a root (stolon/rhysome). It's nice looking what ever it is.

Unfortunately I am not able to determine the grass type from that link because the grass is so small, I cannot see the characteristics listed in the link. The only thing I could determine is that the leaf blade tip shape is pointed and that it has stolons on the weird grass. I don't have a microscope to see the rest of the characteristics. Anyone else have some ideas to share?