Public Resources Code section 3151

“Base fluid” means the continuous phase fluid used in the makeup of a well stimulation treatment fluid, including, but not limited to, an acid stimulation treatment fluid or a hydraulic fracturing fluid. The continuous phase fluid may include, but is not limited to, water, and may be a liquid or a hydrocarbon or nonhydrocarbon gas. A well stimulation treatment may use more than one base fluid.

Source: Section 3151, https://leginfo.­legislature.­ca.­gov/faces/codes_displaySection.­xhtml?lawCode=PRC§ionNum=3151.­ (updated Jan. 1, 2014; accessed Jun. 25, 2025).

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Verified:
Jun. 30, 2025

§ 3151's source at ca​.gov