It's still possible to waive enforcement of arbitration agreements according to Nunez v. Nevell Group, Inc.

Other than the minor surprise I now experience when any motion to compel arbitration is denied, such agreements having achieved a status as super-contracts with super powers, the decision in Nunez v. Nevell Group, Inc. (pub. ord. May 28, 2019) isn’t too surprising. In Nunez, the Court of Appeal (Fourth Appellate District, Division Three) affirmed the trial court’s denial of a motion to compel arbitration on the basis of waiver, delay, and prejudice.

The Court covers two topics in its discussion of waiver that might be of use to others. First, the Court examines the idea of waiver generally. Second, the Court examines the “clear and unmistakable” standard that asks whether a CBA clearly and unmistakably waives the right to a judicial forum for the particular type of claim in question. Keep in mind that, as the Court here observed, federal and California state courts may reach slightly different conclusions regarding application of the “clear and unmistakable” waiver standard, since California Courts are not bound by federal court decisions on the subject.