Cal. Health & Safety Code § 115775

(a) No state funds shall be used by any state agency, onsite employee child care center for state employees, city, county, city and county, district, superintendent of schools, school district, or community college district to purchase wooden playground or recreational equipment where there is a likelihood of contact by children and when the equipment has been treated with any of the following substances:
1. (1) Pentachlorophenol.
2. (2) Creosote.
3. (3) Arsenic, elemental arsenic, or arsenic copper combination, unless the wood is treated with a nontoxic and nonslippery sealer and the seller certifies that the wood is treated in accordance with commodity standard C-17 for playground equipment as adopted by the American Wood-Preservers Association.
(b) The state or any city, county, city and county, district, superintendent of schools, school district, community college district, or onsite employee child care center for state employees that receives education or parks and recreation funds from the state shall not use any portion of these funds for the maintenance or upkeep of any wooden structures treated with any of the substances that are prohibited from purchase pursuant to subdivision (a) and where there is a likelihood of contact by children, unless the state, city, county, city and county, superintendent of schools, school district, district, community college district, or onsite employee child care center for state employees treats the wooden structures with nontoxic and nonslippery sealers and reseals the treated structure in accordance with subdivision (c).
(c) The installer of any wooden playground or recreational equipment that will be available for public use and that has been treated with a substance listed in paragraph (3) of subdivision (a) shall seal the structures with a nontoxic and nonslippery sealant prior to, or at the time of, the installation of the equipment. After the equipment that is available for public use has been sealed pursuant to this subdivision, the owner of the equipment shall reseal the treated equipment every two years thereafter with a nontoxic and nonslippery sealant.