At the submission of a water service application, Water Conservation staff will perform a Water Efficiency Review to ensure compliance with the California Green Plumbing Code standards and the Model Water Efficient Landscape Ordinance (MWELO) when applicable. MWELO is a statewide water conservation regulation for new and rehabilitated developments that promote low-water use landscapes. The implementation and compliance of MWELO and the Water Efficiency Review benefit East Bay Municipal Utility District (EBMUD) by securing water supply for long-term planning and growth.
MWELO applies for:
Single-family/multi-family residential, commercial, public, or institutional projects that require a permit, plan check, and/or a new water meter, change in water meter size, or business classification with:
Construction of 500 square feet or more of new landscaping (e.g. building a new home on a lot)
Rehabilitation/remodeling of landscaping where the total existing landscape is over 2,500 square feet (e.g. constructing a pool and redoing landscaping)
MWELO resources from other agencies:
Click the tabs below as it applies to your specific project
Highly encouraged for projects with automatic irrigation (not required):
If you are not installing landscaping, you still need some basic site plans demonstrating this.
For projects that have existing landscaping and irrigation that are not being modified with the exception of a reduction in area (e.g. building an ADU in the backyard), we need to know if the new unit will be responsible for any irrigation. If the new unit will be irrigating plants, this needs to be indicated on the plans and the irrigation tab.
For projects with existing landscaping that is 2,500 square feet or more that will be renovated (e.g. building an ADU in the backyard and redoing all the landscaping), MWELO applies and a complete landscaping and irrigation plans must be submitted. The irrigation tab on the water service application must also be filled out for all new and existing irrigation zones.
Regardless of water source, applicants need to submit landscaping and irrigation plans that specifically identify well water lines and backflow prevention. If MWELO applies to this project, we still need to confirm compliance of MWELO requirements.
Additionally, you will need to provide:
|Water Efficiency Review - Outdoor Water Use Requirements||5.1 MB|
|DWR Model Water Efficient Landscape Ordinance Regulations||6.8 MB|
|Section 31: Water Efficiency Requirements, 07-01-2021||<1 MB|
|Water Efficiency Review - Indoor Water Use Requirements||3.6 MB|
EBMUD Water Conservation and New Business Office work together to assess what size meter is required to serve all the water needs at the property. Meter sizing is determined by calculating the flow rates of all indoor fixtures (toilets, faucets, etc.) and outdoor fixtures (hose bibs, sprinklers, etc.). By reviewing what your expected water usage will look like inside the building and outside in the landscaping, EBMUD will accurately size your meter.
Once the Water Conservation Division completes the Water Efficiency Review, please reach out to your New Business Office Representative for further information regarding your water service application.
Note: Once the landscaping and irrigation are installed, EBMUD may also coordinate with the project manager or property owner to conduct a site visit to ensure MWELO compliance as needed.
Landscape area is defined as planting areas and water features. Landscaping area is not artificial turf, mulch, pathways, hardscape, or other non-irrigated areas designated for non-development (existing native vegetation, open spaces, etc.).
The irrigation tab is accessed through the water service application. For all new or existing irrigation valves, you must enter information for each individual zone including the gallons per minute flow rate, plant type, hydrozone type, irrigation method, and area in square feet. If you are using more than one controller, they need to be in separate sections. Each controller should have its own section and should be given a designated name ( e.g., main house, A).
The Water Efficient Landscape Worksheet is a calculation based on plant factor (watering needs), type of irrigation, and hydrozone area (group of plants with similar watering needs on the same irrigation zone). Its purpose is to establish a water budget by calculating a project's Estimated Total Water Use (ETWU) and its Maximum Applied Water Allowance (MAWA).
The Water Efficient Landscape Worksheet must be submitted with the MWELO documentation package for residential landscape projects 2,500 square feet or more and non-residential landscape projects 1,000 square feet or more.