CA Civ Proc Code Section 1268.320

The compensation awarded in the proceeding shall cease to draw interest at the earliest of the following dates:

(a)

As to any amount deposited pursuant to Article 1 (commencing with Section 1255.010) of Chapter 6 (deposit of probable compensation prior to judgment), the date such amount is withdrawn by the person entitled thereto.

(b)

As to the amount deposited in accordance with Article 2 (commencing with Section 1268.110) (deposit of amount of award), the date of such deposit.

(c)

As to any amount paid to the person entitled thereto, the date of such payment.