California’s two Democratic senators remain somewhat out of sync over proposed water legislation, underscoring its ambiguous future on the eve of a big hearing.

Four months after Sen. Dianne Feinstein’s introduction of her latest California water package, Sen. Barbara Boxer is still evaluating the 185-page bill. Her wait-and-see attitude hints at complex undercurrents, as she supports some parts of Feinstein’s bill while seeking more feedback about other parts.