Mingyoung Conservation Inc (Mingyoung) is a company that sells or offers for sale plumbing fittings based in Fullerton, California. Mingyoung sold or offered for sale Duko brand kitchen faucets and showerheads in California, from August 2019 to August 2023.

This case was the result of an investigation performed by California Energy Commission (CEC) staff. CEC’s investigation and testing process identified that Mingyoung was selling and offering for sale Duko brand kitchen faucets and showerheads that were not marked properly and were not certified to the Modernized Appliance Efficiency Database System (MAEDbS).

To resolve this matter, Mingyoung executed a Settlement Agreement with CEC on July 3, 2025, for $4,000.00. The penalty monies are deposited into the Appliance Efficiency Enforcement Subaccount as required in Public Resources Code 25402.11. Duko has also agreed to a compliance plan to add the appropriate marking and test and certify all models to MAEDbS before continuing to sell in California.