Amid Geologic Concerns, San Mateo County Planning Approves Zone 3 Seal Cove Residential Project After Geotechnical Consultant Signs Off

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VIDEOS. From San Mateo County Planning meeting on Wednesday, May 27th, 2026 at 9:00am, as a hybrid meeting, with remote comment.  Agenda and correspondence.

Agenda. Staff Report for Item #4: “Consideration of a Design Review and Coastal Development Permit (CDP), pursuant to Chapters 8.252 and 8.256 of the San Mateo County Zoning Regulations, to allow construction of a new 2,726 sq. ft. single-family residence with an attached two-car garage, on a 5,147 sq. ft. undeveloped parcel.

Correspondence for Neighbor at 847 San Ramon



More on Seal Cove and Montara Water and Sanitary District on Coastside Buzz

San Mateo County Planning Approves Two Unpermitted Gates at Seal Cove Bluff, but Planning Director Asserts 50 Years of Recorded Landslide Activity Makes Development Highly Unlikely;

In Light of Seal Cove, San Mateo LAFCo 2026/27 Work Plan Accelerates Municipal Service Review for Montara Water/Sanitary, Half Moon Bay, Granada Sanitary, Sewer Authority and Coastside Water; May 28, 2026

After MWSD Removed 35 Seal Cove Homes from Service, with No Board Action, Rate Payer Asks How $1.1M Awarded Federal Funds Will be Spent and for Supervisors to Accelerate LAFCo Municipal Service Review; May 14, 2026

As Promised, County Moves Forward Seal Cove Next Steps with Surface Water Management Plan, Surface Monitoring, Road Abandonment Criteria and Development in New Landslide Zones; April 29, 2026

Montara Water and Sanitary District’s Attorney Explains Staff’s Efforts to Reply to Seal Cove’s Dozen PRA Requests, Spanning 40 Years, Have Complied with All Statutory Response Requirements; April 4, 2026

Seal Cove Resident Asks LAFCo to Urge Montara Water and Sanitary District to Respond More Quickly to PRA Requests; With Small Staff, MWSD Will Have More Records Available by April 17th; April 2, 2026

New 2025 Seal Cove Geologic Study Shows Landslide will Continue; Supervisor Mueller Explains County to Explore Remediation Costs but a Stormwater Assessment District May be Necessary
; February 24, 2026

Congressman Sam Liccardo Secures $1.1M in Federal Funding for Montara Water and Sanitary District to Relocate Water and Sewer Pipes After Seal Cove Landslides; January 23, 2026

DATE CHANGE: County Holds Community Meeting to Discuss Newly Released 2025 Seal Cove Geologic Study; January 6, 2026

As Land Continues to Slide, the Long-Awaited Seal Cove Geologic Study has been Released for Public Review; Supervisor Mueller to Hold Community Meeting in January 2026; December 18, 2025

Sewer Authority Mid-Coastside Calls Special Board Meeting Due to Significant Exposure to Anticipated Litigation Regarding the Moss Beach Seal Cove Dispute; October 2, 2025

CANCELLED. Supervisor Mueller Holds Community Meeting for Seal Cove Updated Geologic Assessment; September 2, 2025

Midcoast Community Council Receives Presentation on Seal Cove Geologic History from Retired USGS Hydrogeologist who Lives in Seal Cove; June 26, 2025

Supervisor Ray Mueller Requests Documents and Information Related to Water Main Breaks and Service Cancellations in Seal Cove from Montara Water and Sanitary District; June 17, 2025

Supervisor Mueller Holds Study Session for the Moss Beach Seal Cove Residents Regarding Recent Landslide Activity with San Mateo County Public Works, Planning and Building and Montara Water and Sanitary District; June 12, 2025

HMB History Association Lecture ~ The Hidden History of Seal Cove and the Fitzgerald Marine Reserve; June 12, 2025

Sewer Authority Mid-Coastside Board Refers Seal Cove Landslide Residents to Montara Water and Sanitary District and San Mateo County; SAM is Only a Vendor to MWSD for Pipe Cleaning, June 4, 2025

Moss Beach Seal Cove Landslide Residents Meeting at Supervisor Mueller’s Oceano Mall Office, June 2, 2025

Montara Water and Sanitary District Finds 1971 Leighton Geologic Report of the Seal Cove-Moss Beach Area ~ Evidence in the Failed 1975 Kopetzke “Takings” Lawsuit Against San Mateo County, May 28, 2025

SIGN UP for San Mateo County Building and Planning’s Seal Cove Critical Geotechnical Hazards Area for Updates, May 21, 2025

Montara Water and Sanitary District, San Mateo County Public Works and Planning and Building, Coastside Fire and PG&E “Working History” on Seal Cove Landslide Infrastructure Emergency, May 16, 2025

San Mateo County Planning Director Discusses Engineering, Legal and Financial Limitations for the Moss Beach Seal Cove Landslide Causing Cracked Roads, Broken Water and Sewer Pipes, May 7, 2025

Sheriffs Called to Montara Water and Sanitary District Special Meeting Regarding Seal Cove’s Critical Geotechnical Hazards as Community Member’s Outbursts Escalate; March 28, 2025

MSWD Water Leak Along Pescadero-Seal Cove Fault in Moss Beach Causes Water Discoloration; October 7, 2020


3 Geotechnical Reports and 1 Lawsuit Confirm the Consistency of Seal Cove’s Landslides Over 60 Years

1971 Geologic report of the Seal Cove-Moss Beach Area by F. Beach Leighton and Associates.

Lawsuit: 1975 Kopetzke v. County of San Mateo, Board. of Supervisors. “Since the exercise of police power was proper, it did not constitute a taking and no compensation is due. Chicago, Burlington & Quincy Railway Co. v. Illinois, 200 U.S. 561, 26 S. Ct. 341, 50 L. Ed. 596 (1906). To the extent plaintiffs’ losses result from any inherent geologic defects in their properties, the ancient rule of caveat emptor must apply. And to the extent their losses result from the regulatory activities of the Board based on the geologic findings of the Leighton Report, they constitute the unequal burden which citizens are frequently called upon to bear in the interests of the general welfare. Hadacheck v. Sebastian, supra.

See also William Cotton and Associates 1980 Geologic Analysis of the Seal Cove area commissioned by San Mateo County.

San Mateo County Planning and Building’s Seal Cove Critical Geotechnical Hazards Area webpage, including the Seal Cove 2025 Cotton and Shires Geologic Study.


Cotton and Shires Seal Cove Geotechnical Hazard Zones 12/2025

Seal Cove Geotechnical Hazard Zones (MWSD)


San Mateo County Plannning Commission



San Mateo County Board of Supervisors (BoS) Agendas

The Supervisors meet on the 2nd and 4th Tuesdays of the month at 9:00am, as a hybrid meeting.

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