1. (a) Plumbing systems shall be designed pursuant to all state and federal laws and rules.

2. (b)

   1. (1) Backflow prevention shall be applied to each project as required to protect the public water supply and the interior building distribution systems from the potential for cross contamination from a nonpotable or contaminated source.
   2. (2) Many building projects will require an approved backflow prevention device to be installed on the incoming water service prior to the first connection tap.
   3. (3) In addition, all connections to mechanical systems or equipment shall be provided with an approved backflow prevention device at the connection to the equipment or at the point where the dedicated piping system for makeup water begins.
   4. (4) Backflow devices shall be installed in accessible locations and provided with an adequate drain connection to allow proper operation and inspection.
3. (c) All fire sprinkler services and standpipe systems shall be installed with an approved backflow prevention device.
4. (d) All lawn irrigation systems, agricultural/aquatic operations, and wash racks shall be provided with an approved backflow prevention device to protect the public water supply and eliminate cross connection contamination within the facility.

5. (e)

   1. (1) All heating water equipment shall be selected for energy-efficient operation.
   2. (2) Gas-fired heating equipment shall have a minimum AFUE rating of eighty percent (80%).

6. (f)

   1. (1) All plumbing fixtures shall be selected and installed in a manner that is conducive to ease of cleaning of the:

      1. (A) Fixture;
      2. (B) Support; and
      3. (C) Surrounding area.
   2. (2) Cleanliness promotes good indoor air quality and a healthier indoor environment.
   3. (3) System designs should not result in wet, damp, or pooling water, which can be a source of microbiological growth or promote the formation of mold and mildew if left uncleaned.

Codification Notes: "AFUE" means annual fuel utilization efficiency.