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Section A1302 On-Site Nonpotable Water Reuse Systems
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The provisions of Section A1302 shall govern the construction, installation, alteration and repair of on-site nonpotable water reuse systems for the collection, storage, treatment and distribution of on-site sources of nonpotable water as permitted by the jurisdiction.
On-site nonpotable water reuse systems shall collect waste discharge from only the following sources: bathtubs, showers, lavatories, clothes washers and laundry trays. Water from other approved nonpotable sources including
swimming pool backwash operations, air conditioner condensate, rainwater, cooling tower blow-down water, foundation drain water, steam system condensate, fluid cooler discharge water, food steamer discharge water, combination oven discharge water, industrial process water and fire
pump test water shall also be permitted to be collected for reuse by on-site nonpotable water reuse systems, as approved by the code official and as appropriate for the intended application.
Waste water containing urine or fecal matter shall not be diverted to on-site nonpotable water reuse systems and shall discharge to the sanitary drainage system of the building or premises in accordance with Chapter 7. Reverse osmosis system reject water, water softener discharge water, kitchen sink waste water, dishwasher waste water and waste water discharged from wet-hood scrubbers shall not be collected for reuse in an on-site nonpotable water reuse system.
Traps serving fixtures and devices discharging waste water to on-site nonpotable water reuse systems shall comply with Section 1002.4.
On-site nonpotable water reuse systems shall utilize drainage piping approved for use in plumbing drainage systems to collect and convey untreated water for reuse. Vent piping approved for use in plumbing venting systems shall be utilized for vents in the gray water system. Collection and vent piping materials shall comply with Section 702.
Collection piping conveying untreated water for reuse shall be installed in accordance with Section 704.
Collection piping conveying untreated water for reuse shall utilize joints approved for use with the distribution piping and appropriate for the intended applications as specified in Section 705.
Collection piping conveying untreated water for reuse shall be sized in accordance with drainage sizing requirements specified in Section 710.
Untreated water collected for reuse shall be filtered as required for the intended end use. Filters shall be accessible for inspection and maintenance. Filters shall utilize a pressure gauge or other approved method to provide indication when a filter requires servicing or replacement. Filters shall be installed with shutoff valves immediately upstream and downstream to allow for isolation during maintenance.
Where the intended application for nonpotable water collected on site for reuse requires disinfection or other treatment or both, it shall be disinfected as needed to ensure that the required water quality is delivered at the point of use. Nonpotable water collected on site containing untreated gray water shall be retained in collection reservoirs for a maximum of 24 hours.
Gray water used for flushing water closets and urinals shall be disinfected and treated by an on-site water reuse treatment system complying with NSF 350.
Storage tanks utilized in on-site nonpotable water reuse systems shall comply with Sections A1301.9 and A1302.7.1 through A1302.7.3.
Storage tanks shall be located with a minimum horizontal distance between various elements as indicated in Table A1302.7.1.
For SI: 1 foot = 304.8 mm.
| ELEMENT | MINIMUM HORIZONTAL DISTANCE FROM STORAGE TANK (feet) |
|---|---|
| Critical root zone (CRZ) of protected trees | 2 |
| Lot line adjoining private lots | 5 |
| Seepage pits | 5 |
| Septic tanks | 5 |
| Water wells | 50 |
| Streams and lakes | 50 |
| Water service | 5 |
| Public water main | 10 |
Storage tanks shall be designed and constructed in accordance with Chapters
16 through 22 of the International Building Code and in accordance with the following standards, as appropriate for the material of the storage tank: AWWA D100, AWWAD115,AWWAD120, UL58, UL 1746, UL 1316, UL 142, API 12F or API 12D.
Outlets shall be located not less than 4 inches (102 mm) above the bottom of the storage tank and shall not skim water from the surface.
Valves shall be supplied on on-site nonpotable water reuse systems in accordance with Sections A1302.8.1 and A1302.8.2.
One three-way diverter valve listed and labeled to NSF 50 or other approved device shall be installed on collection piping upstream of each storage tank, or drainfield, as applicable, to divert untreated on-site reuse sources to the sanitary sewer to allow servicing and inspection of the system. Bypass valves shall be installed downstream of fixture traps and
vent connections. Bypass valves shall be marked to indicate the direction of flow, connection and storage tank or drainfield connection. Bypass valves shall be installed in accessible locations. Two shutoff valves shall not be installed to serve as a bypass valve.
One or more backwater valves shall be installed on each overflow and tank drain pipe. Backwater valves shall be in accordance with Section 715.
Mechanical equipment including pumps, valves and filters shall be easily
accessible and removable in order to perform repair, maintenance and cleaning. The minimum flow rate and flow pressure delivered by the pumping system shall be appropriate for the application and in accordance with Section 604.
Where the water pressure supplied by the pumping system exceeds 80 psi (552 k:Pa) static, a pressure-reducing valve shall be installed to reduce the pressure in the nonpotable water distribution system piping to 80 psi (552 kPa) static or less. Pressure-reducing valves shall be specified and installed in accordance with Section 604.8.
Distribution piping utilized in
on-site nonpotable water reuse systems shall comply with
Sections A1302.11.1 through A1302.11.3.
Exception: Irrigation piping located outside of the building and downstream of a backflow preventer.
Distribution piping shall conform to the standards and requirements specified in Section 605.
On-site nonpotable water reuse distribution piping systems shall be designed and sized in accordance with Section 604 for the intended application.
On-site nonpotable water distribution piping labeling and marking shall comply with Section 608.8.
Tests and inspections shall be performed in accordance with Sections A1302.12.1 through A1302.12.6.
Drain, waste and vent piping used for on-site water reuse systems shall be tested in accordance with Section 312.
Storage tanks shall be tested in accordance with Section A1301.9.11.
The testing of makeup water supply piping and distribution piping shall be conducted in accordance with Section 312.5.
The testing of backflow preventers and backwater valves shall be conducted in accordance with Section 312.10.
Inlets and vents to the system shall be inspected to verify that each is protected to prevent the entrance of insects and vermin into the storage tank and piping systems in accordance with Section A1301.7.
The quality of the water for the intended application shall be verified at the point of use in accordance with the requirements of the jurisdiction.
Operation and maintenance materials shall be supplied with nonpotable
on-site water reuse systems in accordance with Sections A1302.13.1 through A1302.13.4.
A detailed operations and maintenance manual shall be supplied in hardcopy form with all systems.
The manual shall include a detailed system schematic, and the locations and a list of all system components, including manufacturer and model number.
The manual shall provide a schedule and procedures for all system components
requiring periodic maintenance. Consumable parts, including filters, shall be noted along with part numbers.
The manual shall include system startup and shutdown procedures. The manual shall include detailed operating procedures for the system.
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