1602.9 Design and Installation.

The design and installation of nonpotable rainwater catchment systems shall be in accordance with Section 1602.9.1 through Section 1603.16.

1602.9.1 Outside Hose Bibbs. Outside hose bibbs shall be allowed on rainwater piping systems. Hose bibbs supplying rainwater shall be marked with the words: “CAUTION: NONPOTABLE WATER, DO NOT DRINK” and Figure 1602.9.1.

FIGURE 1602.9.1

328 2019 CALIFORNIA PLUMBING CODE

NONPOTABLE RAINWATER CATCHMENT SYSTEMS

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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. Exception: [BSC] No treatment is required for rainwa- ter used for non-spray irrigation where the maximum storage volume is less than 5000 gallons (18 927 L) where the tank is supported directly upon grade and the ratio of height to diameter or width does not exceed 2 to 1.

1602.9.6.1 Disinfection. Where the initial qual- ity of the collected rainwater requires disinfection or other treatment or both, the collected rainwater shall be treated as necessary to ensure the required water quality is delivered at the point of use. Where chlorine is used for disinfection or treatment, water shall be tested for residual chlorine in accordance with ASTM D1253. The levels of residual chlorine shall not exceed the levels allowed for the intended use in accordance with the requirements of the local Enforcing Agency.

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1602.9.2 Deactivation and Drainage for Cross- Connection Test. 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. 1602.9.3 Rainwater Catchment System Surfaces. Rainwater shall be collected from roof surfaces or other impervious manmade, above-ground collection surfaces. Rainwater collected from surface water runoff, vehicular parking surfaces or manmade surfaces at or below grade shall comply with the water quality requirements for on- site treated nonpotable gray water in Section 1504.0. Exception: Collected rainwater or storm water used exclusively for subsurface landscape irrigation. 1602.9.4 Other Surfaces. Natural precipitation collected from surface water runoff, vehicular parking surfaces, or manmade surfaces at or below grade shall be in accordance with the water quality requirements for on-site treated nonpotable gray water systems in Section 1506.0. Exception: Collected rainwater or storm water used exclusively for subsurface landscape irrigation. 1602.9.5 Prohibited Discharges. Overflows and bleed-off pipes from roof-mounted equipment and appliances shall not discharge onto roof surfaces that are intended to collect rainwater. 1602.9.6 Minimum Water Quality. The minimum water quality for harvested rainwater shall meet the applicable water quality requirements for the intended

sive corrosion or decay and shall be watertight.

TABLE 1602.9.6 MINIMUM TREATMENT AND WATER QUALITY FOR RAINWATER