Cal. Wat. Code § 13328
After the time for judicial review under Section 13330 has expired, the state board may apply to the clerk of the appropriate court in the county in which the civil liability or penalty was imposed, for a judgment to collect the civil liability or penalty. The application, which shall include a certified copy of the state board or regional board action, constitutes a sufficient showing to warrant issuance of the judgment. The court clerk shall enter the judgment immediately in conformity with the application. The judgment so entered has the same force and effect as, and is subject to all the provisions of law relating to, a judgment in a civil action, and may be enforced in the same manner as any other judgment of the court in which it is entered.
Ca. Water Code § 13328