(m) The landlord shall retain an affirmative obligation to maintain in good working order the water supply system to each dwelling unit and any component thereof, including any water conservation device and submeter installed pursuant to this section, and to respond in a timely manner to any request by the tenant for the repair of any defect or malfunctioning in such water supply system, including any leak. Such water supply system to any dwelling unit and any component thereof including, but not limited to, any water conservation device and submeter installed pursuant to this section, shall be governed by and maintained in accordance with the state sanitary code. In the event of any overcharge by the landlord or any violation of the state sanitary code, the tenant shall have all rights and remedies provided under law for such overcharges or such violations including, but not limited to, the rights and remedies provided under chapters 111, 186 and 239.