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1602.0 Nonpotable Rainwater Catchment Systems
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The installation, construction, alteration, and repair of rainwater catchments systems intended to supply uses such as water closets, urinals, trap primers for floor drains and floor sinks, irrigation, industrial processes, water features, cooling tower makeup and other uses shall be approved by the Authority Having Jurisdiction.
No permit for a rainwater catchment system shall be issued until complete plumbing plans, with data satisfactory to the Authority Having Jurisdiction, have been submitted and approved.
No changes or connections shall be made to either the rainwater catchment system or the potable water system within a site containing a rainwater catchment system requiring a permit without approval by the Authority Having Jurisdiction.
Rainwater catchment systems shall have no direct connection to a potable water supply or alternate water source system. Potable or reclaimed (recycled) water is permitted to be used as makeup water for a rainwater catchment system provided the potable or reclaimed (recycled) water supply connection is protected by an air gap or reduced-pressure principle backflow preventer in accordance with this code.
Where a portion of a rainwater catchment system is installed within a building, a cross-connection test is required in accordance with Section 1605.3. Before the building is occupied or the system is activated, the installer shall perform the initial cross-connection test in the presence of the Authority Having Jurisdiction and other authorities having jurisdiction. The test shall be ruled successful by the Authority Having Jurisdiction before final approval is granted.
The design and size of rainwater drains, gutters, conductors, and leaders shall comply with Chapter 11 of this code.
Rainwater catchment water supply and distribution materials shall comply with the requirements of this code for potable water supply and distribution systems unless otherwise provided for in this section.
Materials used in rainwater catchment drainage systems, including gutters, downspouts, conductors, and leaders shall be in accordance with the requirements of this code for storm drainage.
Rainwater storage tanks shall comply with Section 1603.1.
The collection surface shall be constructed of a hard, impervious material.
Rainwater catchment systems shall have a colored background in accordance with Section 601.3. Rainwater catchment systems shall be marked, in lettering in accordance with Section 601.3.3, with the words: "CAUTION: NONPOTABLE RAINWATER WATER, DO NOT DRINK."
The design and installation of nonpotable rainwater catchment systems shall be in accordance with Section 1602.9.1 through Section 1603.16.
The rainwater catchment system and the potable water system within the building shall be provided with the required appurtenances (e.g., valves, air or vacuum relief valves, etc.) to allow for deactivation or drainage as required for a cross-connection test in accordance with Section 1605.3.
Rainwater shall be collected from roof surfaces or other manmade, aboveground collection surfaces.
Natural precipitation collected from surface water runoff, vehicular parking surfaces, or manmade surfaces at or below grade shall be in accordance with the stormwater requirements for on-site treated nonpotable water systems in Section 1506.0.
Overflows and bleed-off pipes from roof-mounted equipment and appliances shall not discharge onto roof surfaces that are intended to collect rainwater.
The minimum water quality for harvested rainwater shall meet the applicable water quality requirements for the intended applications as determined by the Authority Having Jurisdiction. In the absence of water quality requirements determined by the Authority Having Jurisdiction, the minimum treatment and water quality shall be in accordance with Table 1602.9.6.
| APPLICATION | MINIMUM TREATMENT | MINIMUM WATER QUALITY |
|---|---|---|
| Car washing | Debris excluder or other approved means in accordance with Section 1603.14, and 100 microns in accordance with Section 1603.15 for drip irrigation. | N/A |
| Subsurface and drip irrigation | Debris excluder or other approved means in accordance with Section 1603.14, and 100 microns in accordance with Section 1603.15 for drip irrigation. | N/A |
| Spray irrigation where the maximum storage volume is less than 360 gallons | Debris excluder or other approved means in accordance with Section 1603.14, and disinfection in accordance with Section 1603.12. | N/A |
| Spray irrigation where the maximum storage volume is equal to or more than 360 gallons | Debris excluder or other approved means in accordance with Section 1603.14. | Escherichia coli: < 100 CFU/100 mL, and Turbidity: < 10 NTU |
| Urinal and water closet flushing, clothes washing, and trap priming | Debris excluder or other approved means in accordance with Section 1603.14, and 100 microns in accordance with Section 1603.15. | Escherichia coli: < 100 CFU/100 mL, and Turbidity: < 10 NTU |
| Ornamental fountains and other water features | Debris excluder or other approved means in accordance with Section 1603.14. | Escherichia coli: < 100 CFU/100 mL, and Turbidity: < 10 NTU |
| Cooling tower make-up water | Debris excluder or other approved means in accordance with Section 1603.14, and 100 microns in accordance with Section 1603.15. | Escherichia coli: < 100 CFU/100 mL, and Turbidity: < 10 NTU |
For SI units: 1 micron = 1 µm, 1 gallon = 3.785 L
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