Appendix L- Plumbing Options
The most recent update to the Oregon Plumbing Specialty code included the addition of Appendix L, sustainable practices.
Compliance with appendix L is not required unless a local community has adopted it by ordinance. However, a local plumbing official may use the standard as a basis to accept alternative plumbing methods that might not otherwise be approved.
An example of how this might apply is the case of an owner in central Oregon who designed a house that used a rainwater collection system and a recycled water reuse system. They were required to spend several thousand dollars to provide engineering and proofs the system they planned to use were safe. Appendix L includes standards for rainwater collection which, if followed, should satisfy the plumbing inspector the system is safe and simplify the approval process.
Besides rainwater collection systems, the appendix also addresses the recovery and use of condensate water and alternate water supply for irrigation. It sets standards for all types of water-efficient appliances, water heating, irrigation and swimming pool heating systems.
Whether designing a highly efficient house, using non-standard water supplies, or just looking for ideas to improve efficiency Appendix L may be a valuable resource for design ideas and to gain approval for those systems.