Wa Dining Okan has started serving unagi (eel) for the month of July. I think they’re using frozen eel, so it doesn’t have the plumpness of a fresh eel. But its good given the constraints. I don’t know of anyplace in California that serves fresh eel. I’ve only heard of a place in NYC, otherwise Japan. There you have a choice of wild eel or farm grown fresh eel.
Pursuing Wabi 
I don’t know anyone who does fresh Unagi in San Diego, but Kaito Sushi regularly brings in fresh Anago and fillets it in-house during prep. They serve it up as Nigiri with their traditional house-made Tsume or as Tempura. By far the best Sushi I’ve found in San Diego, only to be followed by Sushi-Dokoro Shirahama.