There was something on the news this morning with City of Roseville water conservation dept.. Some brown in your lawn isn't the end of the world. It will come back and is recoverable. Just adhere to the twice a week watering schedule. They said it's better to water twice at 2 or 3 minutes than watering once for 10 minutes.
If your lawn has gone from brown to completely white, it's not coming back. May as well let it go and reassess in the fall and consider replacing with drought-tolerant landscape and/or less lawn.