Ariz. Rev. Stat. § 49-282
A. The water quality assurance revolving fund is established to be administered by the director. The fund consists of monies from the following sources:
E. Monies from the water quality assurance revolving fund shall be used for the following purposes:
2. For all reasonable and necessary costs to implement this article, including:
15. For the reasonable and necessary costs incurred by the department of health services at the request of the director of environmental quality to assess and evaluate the effect of a release or threatened release of hazardous substances to the public health or welfare and the environment. The director of environmental quality and the director of the department of health services shall enter into an agreement for the transfer of these costs. The assessment and evaluation by the department of health services may include: