ITEM:		CONSENT CALENDAR
9.	CONSIDER ADOPTION OF RESOLUTION NO. 2019-09 AMENDING RULE 24, TABLE 4: HIGH EFFICIENCY APPLIANCE CREDITS FOR GRAYWATER AND RAINWATER REUSE
Meeting Date:			July 15, 2019	Budgeted:	N/A
From:			David J. Stoldt,	Program/	N/A
			General Manager	Line Item No.:
Prepared By:			Stephanie Kister	Cost Estimate:	N/A
General Counsel Review: N/A
Committee Recommendation: The Water Demand Committee reviewed this item on April 23, 2019 and recommended approval.
CEQA Compliance: This action does not constitute a project as defined by the California Environmental Quality Act Guidelines Section 15378.

SUMMARY: The California Plumbing Code allows for the reuse of treated rainwater and graywater for flushing toilets and clothes washing. The Monterey County Health Department requires a backup water supply from a reliable source to augment a rainwater/Graywater system. The Water Demand Committee recommended approval for a reduced Water Use Capacity of 75% for toilet flushing with Graywater/rainwater in Multi-Family Dwellings. It should be noted that these systems require compliance with Chapter 15 of the Plumbing Code, including backflow protection and other requirements. Monterey County Health Department permits and approves the system design.

Clothes washing in Multi-Family Dwelling projects is being discussed at the Water Demand Committee meeting on July 11, 2019, as this use was not discussed in April. Staff’s recommendation is to similarly grant a 75% reduced factor in Multi-Family Dwellings that use treated Graywater/Rainwater for clothes washing.

In granting a credit for Graywater and rainwater systems, the District will require meters on the inflow and outflow and on the Potable water backup to the system (as well as annual reporting to the District) to facilitate review of the effectiveness of the system and the appropriateness of the Water Credit. As this technology is relatively new, data will be an important way to verify and quantify reductions in Potable use. The metering and reporting will be recorded as a permanent requirement on the property title. Resolution 2019-09 updates Rule 24, Table 4 High Efficiency Appliance Credits, to reflect the credit.

RECOMMENDATION: Adoption of Resolution 2019-09 with the Consent Calendar will amend Rule 24, Table 4: High Efficiency Appliance Credits to allow for a reduced Water Use Capacity of 75% for toilet flushing and/or clothes washing with Graywater/rainwater in Multi-Family Dwelling projects.

BACKGROUND: In 2013 California Plumbing Code allowed for the reuse of treated rainwater and Graywater for flushing toilets and clothes washing. New construction of hotels and apartment complexes are best able to incorporate this technology in the building design to reduce their water demand. The Monterey County Health Department requires a backup water supply from a reliable source to augment the rainwater/Graywater system. This can be done by installing dual plumbing to the water fixtures or by adding an auto fill valve to the storage tank.

The District has received a request to reduce the Estimated Annual Water Use Capacity for installation of a Graywater system to flush toilets and wash clothes in three proposed Multi-Family Dwellings in Monterey. Staff estimates that between 10 to 15 gallons of treated Graywater (depending on the flush volume of the toilets) would be needed to meet the toilet demands of an apartment with an average of 2.3 persons per household. This demand would be easily offset with Graywater generated from bathing (e.g., one ten-minute shower). Design of the system would need to have adequate storage to meet demand for three days to ensure that the Potable water backup would not be used. A similar requirement would apply to a rainwater system, which would require significantly more storage to meet demands during the dry months.

Staff received direction from the Water Demand Committee on April 23, 2019, regarding amendment to Rule 24, Table 4: High Efficiency Appliance Credits for Graywater and rainwater systems for toilet flushing. This table can be amended by Resolution of the Board of Directors. The Committee discussed whether a complete offset of the toilet fixture count should be available, or whether the fixture count should be reduced for these systems. The Water Demand Committee agreed that a credit of 75% of the fixture unit count for toilet flushing should be applied to Multi-Family Dwelling residential projects that flush toilets with rainwater and/or Graywater systems, and that Rule 24, Table 4 High Efficiency Appliance Credits should also be amended to reflect the credit.

This item was pulled from the June Consent Agenda for review of the water-metering requirement by the Water Demand Committee on July 11, 2019.

EXHIBITS

9-A Draft Resolution 2019-09

9-B Table 4 – Attachment 1 to Draft Resolution 2019-09

U:\staff\Boardpacket\2019\20190715\ConsentClndr\09\Item-9.docx