(a) Notwithstanding subdivision (b) of Section 116785, a local agency may, by ordinance, limit the availability, or prohibit the installation, of residential water softening or conditioning appliances that discharge to the community sewer system if the local agency makes all of the following findings and includes them in the ordinance:

1. (1) Limiting the availability, or prohibiting the installation, of the appliances is a necessary means of achieving compliance with waste discharge requirements issued by a California regional water quality control board. In determining a necessary means of achieving compliance, the local agency shall assess both of the following:

   1. (A) The technological and economic feasibility of alternatives to the ordinance.
   2. (B) The potential saline discharge reduction of the ordinance.
2. (2) The local agency has adopted and is enforcing regulatory requirements that limit the volumes and concentrations of saline discharges from nonresidential sources in the community waste disposal system to the extent technologically and economically feasible.

(b) Notwithstanding subdivision (b) of Section 116785, a local agency may, by ordinance, limit the availability, or prohibit the installation, of residential water softening or conditioning appliances that discharge to the community sewer system if the local agency makes all of the following findings and includes them in the ordinance:

1. (1) Limiting the availability, or prohibiting the installation, of the appliances is a necessary means of achieving compliance with the water reclamation requirements or the master reclamation permit issued by a California regional water quality control board. In determining a necessary means of achieving compliance, the local agency shall assess both of the following:

   1. (A) The technological and economic feasibility of alternatives to the ordinance.
   2. (B) The potential saline discharge reduction of the ordinance.
2. (2) The local agency has adopted, and is enforcing, regulatory requirements that limit the volumes and concentrations of saline discharges from nonresidential sources to the community waste disposal system to the extent technologically and economically feasible.