California Code, Health and Safety Code - HSC § 7054.5

(a) Reduced human remains may be disposed of by integration into the topsoil by the person having the right to control the disposition of the remains pursuant to Section 7100.

(b) A reduction facility may integrate reduced human remains into the topsoil of a conservation area if the person having the right to control the disposition of those remains has agreed, in writing, to that disposition.

(c) Integration of reduced human remains into soil below the topsoil is a violation of Section 7054.

(d) For purposes of this section, the following definitions apply:

(e) This section shall become operative on January 1, 2027.