Okla. Stat. tit. 27A, § 27A-2-4-304

performed by accredited laboratories.

A. The Department of Environmental Quality shall accept reports

or laboratory analyses performed by accredited laboratories but may

reject analyses that were not performed in compliance with the

Department's rules or the laboratory's accreditation. The

Department may require that reports or laboratory analyses which are

submitted pursuant to this Code, rules promulgated or permits and

orders issued pursuant thereto shall be performed by laboratories

accredited by the Department if the submission of reports or

laboratory analyses performed by an accredited laboratory is

specifically required or authorized by this Code, rules promulgated

thereto or federal law or federal regulations.

B. The Department shall accept laboratory reports and analyses

prepared and performed by Department-certified laboratory operators

for operational testing of municipal wastewater treatment systems

and water supply systems provided that the analyses were performed

in compliance with the Department's rules or the terms of the

laboratory operator's certification.

C. Acceptance of such reports or analyses shall not preclude

the Department from declining for cause to rely on such results or

from requiring additional laboratory analyses or reports from the

person submitting such analyses or reports.