Embarcadero YMCA Pool

Nice facilities. Main 25 meter pool has 5 lanes with varying speeds, and the waterline reaches right to the pool deck and the lanes are uniformly shallow. so you can stand at the end with head above water if you are resting. There’s a separate activity pool for fitness classes. Water seems to be treated differently from other YMCA pools, so I don’t smell as much chlorine. Wikipedia states they use ozone and chlorine.
Compared to Letterman Aquatics (YMCA), there are more lap hours — in the current schedule at least. probably since they use the activity pool for fitness classes. Best to check since teams or classes may start-​up.
Can get crowded during before & after working hours but not as much during weekend mornings, for example. During crowded times, you almost certainly will circle swim and some swimmers seem to be get particular about those who are too fast or too slow, which can be a problem if you want to change your pace. But overall, people are generally nice but let the guards mediate if needed.
Locker room is spacious, carpeted and the men’s locker room has a nice view of the bay and the breeze from the open windows is pleasant in mild days.
For people who don’t want to carry their swimsuit back home, they have a wire grid where people padlock swimsuits to it. There’s a sauna and steam room in the locker room too, right by the shower.
They have a supply of pull buoys and kick boards to borrow.

Awesome pool and summer camp program. Kids can take swim lessons everyday for an additional fee through the summer camp. The instructors are all extremely friendly and highly competent. Pool is warmer than I like for lap swimming but great for swim lessons and the aqua aerobics programs they offer.