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.
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.
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.
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 onsite treated nonpotable gray water in Section 1504.0.
Exception: Collected rainwater or storm water used exclusively for subsurface landscape irrigation.
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.
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.
Exception: [BSC] No treatment is required for rainwater 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.
Where the initial quality
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.
