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ITEM: |
CONSENT
CALENDAR |
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CONSIDER ADOPTION OF RESOLUTION 2020-01
AMENDING RULE 25.5, TABLE 4: HIGH EFFICIENCY APPLIANCE CREDITS, TO ALLOW RAINWATER/GRAYWATER
SYSTEMS IN ALL RESIDENTIAL APPLICATIONS |
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Meeting
Date: |
January 23, 2020
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Budgeted: N/A |
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From: |
David J.
Stoldt, |
Program/ |
N/A |
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General
Manager |
Line Item No.: |
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Prepared
By: |
Stephanie Kister |
Cost
Estimate: |
N/A |
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General Counsel Review: N/A |
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Committee Recommendation: The Water Demand Committee reviewed this
item on January 16, 2020. A recommendation
was not available for the Board’s packet.
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CEQA
Compliance: Exempt per
CEQA § 15061-b-3
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SUMMARY: On July 15, 2019, the MPWMD Board of Directors adopted Resolution 2019-09, Amending Rule 25.5, Table 4: High Efficiency Appliance Credits for Graywater and Rainwater Reuse Systems. That resolution established a High Efficiency Appliance Credit (Rule 25.5) for the installation of rainwater/Graywater reuse systems for toilet flushing and clothes washing in Multi-Family Dwellings. Resolution 2020-01 (Exhibit 3-A) modifies Rule 25.5, Table 4, to allow rainwater/Graywater credit for any Residential application where the applicant can provide evidence that there is sufficient Alternative Water Sources and storage to meet the needs of the project.
BACKGROUND: As of 2013, the California Plumbing Code
allows for the reuse of treated rainwater and Graywater for toilet flushing and
clothes washing. The Monterey County Health Department requires a backup water
supply from a reliable source to augment the rainwater/Graywater system if
needed. New construction and remodel projects are best able to incorporate this
technology in the building design to reduce water demand. This can be done by
installing dual plumbing to the water fixtures or by adding an auto fill valve
to the storage tank (the latter is the preferred method for MPWMD and
California American Water).
District staff has reviewed the Estimated Annual Water Use Capacity for a
Graywater system to flush toilets in a Residential Dwelling Unit. Staff estimates that between 10-15 gallons of
treated Graywater (depending on the flush volume of the toilet) would be needed
to meet the toilet demand in a Household with an average of 2.3 persons (local
average). This demand could be easily
offset with Graywater generated from bathing (i.e., one ten-minute
shower). Design of the system requires adequate
storage to meet annual demand plus three days to ensure that the Potable water
backup would not be used. A similar
requirement applies to a rainwater system, which would require significantly
more storage to have water available to meet demands during the dry months.
Resolution 2019-09, amends Rule 25.5, Table 4: High Efficiency Appliance Credits, to allow credit for Graywater and Rainwater Reuse Systems. The credit is a 75% reduction to the fixture unit count for toilets and/or Clothes Washers supplied by rainwater/Graywater. Requirements to grant the credit include the following:
· The rainwater/Graywater system capacity shall meet 100 percent of projected annual demand plus three days.
· Meters are required on rainwater/Graywater outflow and on the Potable back-up connection to the system, with an annual District reporting requirement.
· A Notice and Deed Restriction Regarding Limitation on Use of Water on a Property will be recorded on the property title.
DISCUSSION: Affordable Graywater recycling technology is now available for Single-Family/small scale Residential use. New space-efficient products are entering the market-place, making small scale water recycling easier to do. Rainwater harvesting systems are already readily available for properties of all sizes. Most Single-Family Dwellings have the same capacity to utilize these technologies as Multi-Family Dwellings.
RECOMMENDATION: Staff recommends the Board adopt Resolution 2020-01 amend Rule 25.5, Table 4, to allow credit for Residential rainwater/Graywater reuse systems that utilize these Alternative Water Sources to flush toilets and wash clothes. The resolution will be adopted upon approval of this item in the Consent Calendar.
EXHIBIT
3-A Draft Resolution No. 2020-01
U:\staff\Boardpacket\2020\20200123\ConsentCalendar\03\Item-3.docx