N.Y. Comp. Codes R. & Regs. tit. 21, § 509.18 – Showerheads efficiency standards.

(a) The following definitions refer to showerheads:
1. (1) Hand-held showerhead means a showerhead that can be held or fixed in place for the purpose of spraying water onto a bather and that is connected to a flexible hose.
2. (2) Plumbing fitting means a device that controls and guides the flow of water in a supply system. A plumbing fitting includes a showerhead, lavatory faucet, kitchen faucet, metering faucet, lavatory replacement aerator, kitchen replacement aerator, wash fountain, commercial pre?rinse spray valve, public lavatory faucet, or tub spout diverter.
3. (3) Showerhead means a device through which water is discharged for a shower bath and includes a body sprayer and handheld showerhead but does not include a safety showerhead.
4. (4) Showerhead?tub spout diverter combination means a group of plumbing fittings sold as a matched set and consisting of a control valve, a tub spout diverter, and a showerhead.
5. (5) Tub spout diverter means a device designed to stop the flow of water into a bathtub and to divert it so that the water discharges through a showerhead.
6. (6) Water use means the quantity of water flowing through a showerhead or faucet, at point of use, determined using the test method.
  (b) Standard requirements for showerheads.
7. (1) The flow rates of showerheads shall not be greater than 1.8 gallons per minute at 80 pounds per square inch.
  (c) Test procedures for assuring compliance with the standards established in subdivision (b) of this section.
8. (1) The test methods for showerheads are:
  1. (i) Maximum flow rate test. The test method for determining maximum flow rate of a showerhead is 10 CFR section 430.23(t) (Appendix S to Subpart B of Part 430), as incorporated by reference in section 509.61 of this Part.
  2. (ii) Minimum flow rate test. The test method for determining minimum flow rates of a showerhead is ASME A112.18.1-2012 / CSA B125.1-2012, section 5.12.
  3. (iii) Showerheads with multiple nozzles. Showerheads with multiple nozzles shall be tested with all nozzles in use at the same time.