- ISO/IEC 17065, Conformity assessment — Requirements for bodies certifying products, processes, and services.
- ISO/IEC 17020, Conformity assessment — Requirements for the operation of various types of bodies performing inspection.
- Appendix D, “WATER RATING INDEX” of ICC 700-2020, National Green Building Standard, April 2020, an American National Standards Institute (ANSI) approved standard (see below).
- The City of Santa Fe, NM Residential Green Building Code
- [EPA] WaterSense Specification for Homes.
- [EPA] WaterSense Home Certification System.
- [EPA] WaterSense Technical Evaluation Process for Approving Home Certification Methods.
- Only the edition cited applies for dated references. The latest edition of the referenced document applies for undated references.
WERS for WaterSense or WERS-WS is in alignment with Appendix D of the ICC 700-2020 except for the following (see attached file for additional details):
- ICC 700-2020 D101.6 (3): Baselines are changed for WERS-WS to meet the corresponding baselines as outlined in the WaterSense Technical Evaluation (WSTE) dated February 2021:
- Dishwashers [ 5.00 GPC for WERS-WS instead of 6.50 GPC as noted in the ICC 700]
- Clothes washers [ 6.50 WF for WERS-WS instead of 9.50 WF as noted in the ICC 700]
- ICC 700-2020 D101.6 (4): Verified / daily use factors as per Table 1 are changed for WERS-WS to meet the corresponding baselines as outlined in the WaterSense Technical Evaluation (WSTE) dated February 2021.
- Dishwashers [0.1 loads per person per day for WERS-WS instead of .26 which is the per household factor]
- Clothes washers [0.3 loads per person per day for WERS-WS instead of .78 which is the per household factor]
- ICC 700-2020 D101.6 (8): Other appliances as per Table 4 note the defaults for Clothes washers as 9.5 IWF and Dishwashers as 6.5 GPC. The defaults used for dishwashers and clothes washers as outlined in the ICC 700-2020 Appendix D are only for appliances for which there is absolutely no information available. However, for WERS-WS:
- For new homes receiving new appliances, the defaults are to be that of appliances that meet the minimum performance to qualify for Energy Star per “ENERGY STAR® Program Requirements Product Specification for Residential Dishwashers Eligibility Criteria -Version 4.1”.
- For existing homes or new homes utilizing relocated and/or existing appliances that are Energy Star labeled, then the default will follow the minimum performance to qualify for Energy Star at the time of purchase.
- These defaults are outlined on the “Documentation and Defaults” tab of the WERS Tool.
- ICC 700-2020 D101.8: The Baseline for Outdoor Water Use for WERS-WS is changed to meet the corresponding baseline as outlined in the WaterSense Technical Evaluation (WSTE) dated February 2021. [ The entire landscaped area is considered as comprised of cool season turfgrass irrigated with spray irrigation and an irrigation factor of .58 for WERS-WS.]
- ICC 700-2020 D101.8 (2): For WERS-WS watering months, the mean Julian date earliest “last freeze” is deducted from the mean Julian date last “first freeze” to derive the potential number of days requiring outdoor watering. This number is in turn divided by 30 and rounded to the nearest whole month.
- ICC 700-2020 (4)(c) Irrigation Efficiency Table 8: In WERS-WS; Pools, rain gardens, and fountains have the same IE as flood irrigation.
- ICC 700-2020 (5) (c) Evapotranspiration (month) Table 9 Relative Water Use by Plant Type: For WERS-WS simplified inputs match the standard exactly. However, WERS-WS verifiers are also allowed to use the detailed inputs.