1. (1) All water conservation performance standards for plumbing fixtures and fittings adopted by any signatory state or political subdivision within the Delaware River Basin shall comply with the following minimum standards:

   1. (i) for sink and lavatory faucets, maximum flow shall not exceed three gallons of water per minute when tested in accordance with American National Standards Institute (ANSI) A112.18.1M;
   2. (ii) for shower heads, maximum flow shall not exceed three gallons of water per minute when tested in accordance with ANSI A112.18.1M;
   3. (iii) for water closets and associated flushing mechanism, maximum volume shall not exceed an average of one and six-tenths gallons per flushing cycle when tested in accordance with the hydraulic performance requirements of ANSI A112.19.2M and ANSI A112.19.6M; and
   4. (iv) for urinals and associated flushing mechanism, maximum flow shall not exceed one and one-half gallons of water per flush when tested in accordance with the hydraulic performance requirements of ANSI A112.19.2M and ANSI A112.19.6M.
2. (2) Any water conservation performance standards adopted prior to the effective date of this regulation that are not in compliance with the provisions of paragraph (1) of this subdivision shall be amended or revised to comply with the provisions of paragraph (1) of this subdivision by July 1, 1991.

3. (3) The Commonwealth of Pennsylvania is encouraged to adopt water conservation performance standards for plumbing fixtures and fittings that comply with the provisions of paragraph (1) of this subdivision by July 1, 1991. The commission shall notify all municipalities within the Pennsylvania portion of the basin of the requirement to adopt and enforce local regulations that comply with the provisions of paragraph (1) of this subdivision if Pennsylvania has not adopted such standards. Upon notification of the commission, municipalities shall have one year to adopt such local regulations.

   (b)

4. (1) The performance standards of subdivision (a) of this section shall apply to plumbing fixtures and fittings installed in new construction and, where provided in state or local regulations, in existing structures undergoing renovations involving replacement of such fixtures and fittings.
5. (2) The performance standards of subdivision (a) of this section shall not apply to fixtures and fittings such as emergency showers, aspirator faucets, and blowout fixtures that, in order to perform a specialized function, cannot meet the standards specified in subdivision (a) of this section.
6. (c) To be acceptable for use in the basin, plumbing fixtures and fittings shall be certified and labeled by the manufacturer as meeting the water conservation performance standards specified in subdivision (a) of this section. Certification shall be based on independent test results. Plumbing fixtures and fittings shall be labeled in accordance with ANSI A112.18.1M and ANSI A112.19.2M.
7. (d) The Executive Director shall periodically review the performance standards and testing requirements set forth in subdivision (a) of this section to determine their adequacy in light of advances in technology for water conservation fixtures and fittings. The results of such reviews, including any recommendations for more stringent water conservation performance standards, shall be presented to the commission.
8. (e) Municipalities of the Commonwealth of Pennsylvania seeking permit approval or renewal under section 3.8 of the compact for water supply or wastewater discharge projects shall document that regulations consistent with subdivision (a) of this section have been adopted within their area of jurisdiction. Such documentation shall be a condition for permit approval or renewal.

(a)