(Reference pressure ranges when using this Table.)

Please visit the following link for additional information regarding Backflow. 

MCWD’s water supply shortage level may limit or prohibit installation of landscape. See our Water Conservation Regulations page for current water restriction level. Compliance with Town of Mammoth Lakes Water Efficient Lanscape Ordinance (WELO) is required for all new irrigation systems and all irrigation systems being modified. Additional information can also be found on the California Department of Water Resources (WELO).

A separate irrigation meter may be required for new installations or modifications. 

Permits to install landscaping are required for any customer proposing to (1) replace 2,500 square feet or more of existing landscaping, (2) when adding landscape to a property increasing the total landscape area to 500 square feet or greater, and (3) for new construction projects with a landscape area equal to greater than five hundred (500) square feet.

Installation of an approved backflow prevention assembly is required for all irrigation systems and must be installed prior to irrigation system connection if an RP assembly is not installed on the main line.

Please take all the above into consideration prior to ordering plants and/or landscape materials and see our Outdoor Conservation and Turf Replacement Rebate Program pages for resources and recommended plant lists. 

To schedule an inspection, click the link below for the appropriate inspection. Please include permit number, project description, site address and any additional information needed. Staff will respond to you accordingly. Please keep in mind inspections are usually scheduled in the afternoon during the work week.

Select the type of inspection you are interested in and an email box will pop-up:

• Initial Backflow Inspection
• Preliminary Inspection
• Rough-In Inspection
• Final Inspection

If you need immediate assistance, please contact Kristina Roberts, Permit Official and Inspections directly at (760) 965-6054. 

All Food Service Establishments (FSE), new and existing, must comply with MCWD’s FOG Control Program (fats, oils, grease). Any existing FSE or Property Owner which substantially changes its menu, operations, or tenant improvements, shall submit in writing a detailed description of the proposed changes. Requirements for FOG Control Program compliance including the potential use of a Grease Control Device (such as grease trap) will be assessed by MCWD based on the information contained in the description and an inspection. FOG permits, waivers, stays, or variances may be revoked, replaced, or amended as the changed circumstances warrant.

For more FOG information please click here. 

In compliance with Lahontan Regional Water Quality Control Board and state regulations, MCWD provides trucked recycled water at the Wastewater Treatment Plant fill station for the following uses:

Construction Site Soil Compaction
Backfill Consolidation for Non-Potable Piping
Mixing Concrete
Construction Site Dust Control
Cleaning Roads, Sidewalks, and Outdoor Work
Restricted Access (Freeway) Landscape Irrigation

An annual Trucked Recycled Water Use Permit, obtained from the District, is required. Users must agree to comply with state requirements for recycled water use, and vehicles must be inspected by District staff. Trucked recycled water can be used within the District’s service area, in portions of southern Mono County, and in the Reds Meadow area as shown on the MCWD Recycled Water Use Area map.

If you have any questions, please contact the MCWD Wastewater Chief Plant Operator at 760-934-2596 ext. 306.