Beginning on January 1, 2014, when a permit is issued for the alteration or improvement to a single-family dwelling, noncompliant plumbing fixtures must be replaced with water-conserving fixtures as a condition of the issuance of a certificate of occupancy, or final approval. The responsibility is that of the permit holder, regardless of the type of alteration or improvement being made to the dwelling. This requirement is to be enforced by the local building department and can be found in Civil Code Section 1101.4.Also on and after January 1, 2014, noncompliant plumbing fixtures must be replaced with water-conserving fixtures in multifamily residential real property and commercial real property, when a permit is issued and the result is an increase in floor area of 10% or greater, or when the construction valuation is greater than $150,000, or when a room is to be altered or improved and the room has noncompliant plumbing fixtures. The installation of the water-conserving plumbing fixtures is to be a condition of the issuance of the certificate of occupancy or final approval. This requirement of law must be enforced by the local building department. See our discussion about SB 745 in our legislative section.There are a number of conditions and exemptions provided, so read Civil Code Sections 1101.2 through 1101.8 for all the details at the*legislative website. You will notice that there are additional requirements coming in 2017 and 2019, read SB 745