Sandmound Rd Area - Water Quality

Currently, the independent well (M-27) serving Willow Park Marina and Mariner Estates, is under a compliance order from Contra Costa Health Services to address elevated arsenic levels as of March 31, 2021.

The compliance order requires a permanent solution, engineered by the District, within the next three years. Quarterly notifications are also required to be sent to property owners.

Updated November 1, 2022: The Rural Community Assistance Corporation (RCAC) has been providing technical assistance throughout this project. Recently, RCAC was able to get an executed contract with CDM Smith (Engineering firm) to begin the feasibility study of the four water systems for possible voluntary consolidation. After initial technical kickoff calls this fall, there will be a public outreach and engagement meeting in early 2023.

Updated January 18, 2023: CDM Smith launched the initial data collection of the affected water systems. A workshop will be held at the next stakeholder meeting on February 14, 2023, to present information on the project and get feedback from stakeholders.  The invitation will be sent through the current stakeholder email list. All stakeholders are encouraged to attend the meeting and reach out to encourage additional participation from other participating water systems and Board members.

All updates and documentation regarding current systems under a county compliance order will be found on this page.

Current Systems Under County Compliance Order

M-27 (Willow Park Marina and Mariner Estates)

Delta Mutual Water Company

Upcoming Meetings

There are no meetings scheduled at this time. 


Previously Held Meetings

  • An initial kick off call was held on Wednesday, November 17, 2021. This was hosted by RCAC along with Diablo Water District. Please contact Kait Knight, at (925) 625-6587 with any questions.  You can watch the meeting here.  Monthly follow up meetings will be held throughout the initial phase of this Technical Assistance.
  • A Special Board Meeting was held on Monday, May 10, 2021 where the greater Sandmound Rd area water quality and community water systems update and discussion took place.  Please visit our Board Agendas and Minutes page for more information.