(a) Financial assurance demonstrations shall comply with the wordings of the mechanisms as described in Subchapter A of this chapter (relating to General Financial Assurance Requirements), Subchapter B of this chapter (relating to Financial Assurance Requirements for Closure, Post Closure, and Corrective Action), Subchapter C of this chapter (relating to Financial Assurance Mechanisms for Closure, Post Closure, and Corrective Action), and Subchapter D of this chapter (relating to Wording of the Mechanisms for Closure, Post Closure, and Corrective Action), except operation should be substituted for closure.(b) The prospective owner or operator of a public water system may be ordered to provide adequate financial assurance to operate the system as specified in §290.39(f) of this title (relating to General Provisions). A public water system that was constructed without approval or has a history of noncompliance or is subject to commission enforcement action as specified in §290.39(n) of this title, may be required to provide financial assurance to operate the system in accordance with applicable laws and rules.