Commercial toilet flushing with reclaimed water requires the appropriate water-quality class, direct-reuse authorization and an approved building connection design. Arizona lists Class A as the minimum reclaimed-water class for toilet and urinal flushing; Class A+ may also be used. Confirm utility availability, permits and cross-connection safeguards before treating a purple pipe as an approved fixture supply.
What water quality does Arizona require?
Arizona's current R18-11 Article 3 Table A lists Class A as the minimum reclaimed-water class for toilet and urinal flushing. The rule also permits Class A+ for the direct reuses listed for Class A. Do not confuse a treatment class with automatic permission to connect a particular building: the actual source, reuse approval and installation all matter.
Ask the reclaimed-water provider which class it supplies and whether service is available for this use at the property. Keep the provider's written information with the design record. Pipe color, a marketing description or the fact that a neighboring property irrigates with reclaimed water does not establish the class or service approved for this project.
Commercial graywater irrigation is a different authorization. Water collected from a fixture is not automatically Class A reclaimed water suitable for toilet flushing.
What permissions and design documents are needed?
Arizona's direct-reuse rules in R18-9 Article 7 establish authorization requirements for reclaimed-water use. ADEQ's Type 2 direct-reuse materials explain the notice process and applicable requirements for Class A or A+ supply. Identify the responsible provider and permitting authority, then ask which permit or authorization covers the proposed user and use.
Have the design team coordinate the nonpotable distribution, fixture connections, labeling, service access and required potable-system protection under the applicable plumbing code and utility standards. Ask the building authority what review, permit, inspection and acceptance records it requires. State water-quality approval does not by itself approve an unreviewed connection inside the building.
Include the reclaimed-water arrangement in the commercial equipment and plan-review package. A cross-connection survey identifies potential connections, while assembly testing documents a separate protection requirement; neither is a substitute for the complete approved design.
How should the system be handed over and changed?
Record the water provider, permitted class and use, approved drawings, inspections, protection devices and responsible operating contacts. Label the served fixtures and nonpotable system as the approved documents require. Keep these records in the project closeout package so future maintenance can identify the system accurately.
Do not make a temporary potable-to-reclaimed tie or bypass when service is interrupted. The owner should contact the provider and qualified design or plumbing personnel about any proposed backup supply or modification. A safe-looking connection and clear water do not establish compliance. Before adding fixtures or changing the use, confirm that the existing authorization and design cover the change.