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Los Alamos Hills Water Facilities Project


Project Description: This project is located in Murrieta near Los Alamos and Mary Place. The project scope has been updated as of 01/18/2023 to include 36 residences that rely solely on privately owned wells for their water supply.  The City of Murrieta secured $3 million in American Rescue Plan Act (ARPA) funding and is working in partnership with EMWD to support the construction of water infrastructure for annexed residents in the Los Alamos Hills community.  The project includes installation of approximately 6,720 linear feet of 8-inch diameter pipeline, 4,040 linear feet of 12-inch diameter pipeline, and related auxiliary work.

Los Alamos Hills Project Fact Sheet

Project Location: The proposed project would be a looped water system and would serve approximately 36 properties within the community that fronts Los Alamos Road, Celia Road, Mary Place, and Mason Road.

Week of April 8, 2024

Starting Monday April 8th, SEMA Construction Inc. will be utility potholing on Ruth Ellen Way in Murrieta near the Los Alamos Sports Park.  Traffic on Ruth Ellen Way will be reduced to one lane and there will be construction flaggers in place. 

The waterline installation work on Celia Road continues successfully, with installation nearing Mary Place.  Work on Mary Place will begin on Wednesday, April 10th. 

Thank you for your patience as we work to complete this important construction project for the community.  If you have any questions or concerns, please contact Roxanne Rountree at 951.928.3777 x4391 or


Week of April 1, 2024

EMWD’s contractor, SEMA Construction, Inc., will close a portion of Los Alamos Road between Ruth Ellen Way and Via Santee for utility locations potholing.  

Detour signage will be in place. This work is being done during Spring Break to minimize impacts to Rail Ranch Elementary School.

-Traffic headed west on Los Alamos will be detoured to Whitewood Road via Ruth Ellen Way.

-Traffic headed east on Los Alamos will be detoured to Ruth Ellen Way via Whitewood Road.

-Residents near Rail Ranch Elementary School will have access by way of Via Santee Road and Via Cuena Road. Residents will have access at all times.

EMWD appreciates the community’s patience as we complete this important project.  

February 15, 2024 – Construction Commencement

EMWD’s Board of Directors awarded the Los Alamos Hills Water Facilities Project to SEMA Construction, Inc. In the coming weeks (weather permitting), SEMA will begin utility potholing, surveying and pre-construction video in anticipation of breaking ground. EMWD appreciates your patience and understanding as we work to complete this important project. If there are questions about the project, please email Roxanne at 

December 8, 2023 Update

On December 6, 2023, EMWD’s Board of Director’s approved and authorized an award contract with SEMA Construction, Inc. and Converse Consultants for the construction of the project. More details to follow. 

November 17, 2023 Update

EMWD has received construction bids for the Los Alamos Hills Water Facilities Project.  These bids are being reviewed and will go to our Board of Directors Meeting on December 6, 2023, for approval. 

July 11, 2023 Metropolitan Water District (MWD) Annexation Board Approval

On July 11, 2023, MWD adopted a resolution to approve the 114th fringe area annexation to EMWD/MWD for the Los Alamos Hills Community. 

Click the link on the right to view MWD’s Board of Directors presentation.


NOTARY MEETING: January 10, 2023 

Project Presentation: 5:30 p.m. Notary Signing: 6 p.m. – 7:30 p.m.

Location: Alderwood Clubhouse 28610 Baxter Road, Murrieta CA 92563

EMWD Public Hearing Presentation 12.07.22

Public Hearing Presentation 12.07.22

Los Alamos Hills Town Hall Presentation 10.13.22

Town Hall Presentation

Los Alamos Hills Acreage Map 

Los Alamos Hills Acre Map

Los Alamos Hills Looped System Map

Los Alamos Hills Looped System Map

Project Contact Information:
Roxanne Rountree
Public Affairs Manager
951-928-3777, ext. 4391

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