I've never planted a lawn of it, but I've planted a clump of Carex praegracilis in heavy clay soil with two young 60-pound dogs trampling on it regularly, and I found that it didn't at all mind the long, dry, summers that get much hotter here in the Sacramento Valley than for you in the Bay Area. I've been extremely pleased with it; the only problem I've had with it is that Bermuda grass came up in the middle of it and I had a very difficult time separating them. The sedge wasn't entirely thrilled about having me tear up its roots to extract the Bermuda grass. But after sulking limply for a few months, the sedge did recover and survive.

You don't way whether this is shaded in winter, or full sun. Almost any turf grass, and especially the heavily promoted Tall Fescue Blends will tend to thin out and get weaker with limited winter sun and poor drainage. My experience with C. praegacilis is that it also prefers a faster draining soil mix, and can rot out in heavy clay soils with poor drainage. I'd suggest that C. divulsa/berkeley sedge might be a tougher choice, or if you have full sun, you might consider Dymondia margaratae.

What about UC Verde?

Here is a link that might be useful: Information on UC Verde low water lawn for California