Cal. Civ. Code § 170-15-2-3

Sec. 3.
(a) Sub-bills may contain other permissible charges on the same bill if the sub-billing information is separately itemized and visually distinct
from unrelated charges.
(b) Sub-bills must show at least the following information:
(1) The sub-billing date.
(2) The sub-billing rate charged.
(3) The previous balance, if any.
(4) The amount of the sub-bill.
(5) The amount of a tenant's, member's, or co-owner's usage, if applicable.
(6) The amount of an initial setup fee, if due.
(7) A reasonable administrative fee, if any, not to exceed the statutory limit in IC 8-1-2-1.2(l)(4)(B).
(8) The amount of an insufficient funds fee, if due.
(9) The date on which the sub-bill is due, with a statement that the sub-bill due date is independent from the due date of the lease
payment or other charges.
(10) If an estimated sub-bill, a clear and conspicuous coding or other indication identifying the sub-bill as an estimated sub-
bill.
(11) An explanation, which is readily understood, of all codes or symbols, or both, shown on the sub-bill.
(12) The name and telephone number of a person for tenants, members, or co-owners to contact about sub-billing
matters.
(13) The beginning and end date of the period for which the sub-bill is rendered.
(14) The name and address of the tenant, member, or co-owner being billed.
(15) The address or other identifying information for the dwelling unit being billed.
(16) The statement required by IC 8-1-2-1.2(m)(2)(C), including the following contact information for the commission:
(A) (800) 851-4268.
(B) www.in.gov/iurc.

(17) For water sub-bills, the following additional information:
(A) If the dwelling unit's usage is sub-metered, the dates and meter readings of the dwelling unit's sub-meter at the beginning and end of
the period for which the sub-bill is rendered.
(B) The name and telephone number of a person for tenants, members, or co-owners to contact about water service
matters.