SANTA MARGARITA, San Luis Obispo County — October 28, 2026. A new California law could eventually allow swimming at Santa Margarita Lake for the first time under updated drinking-water safeguards. However, county officials have issued an important warning: swimming is not permitted today, and the law’s January 1, 2027 effective date will not automatically open the reservoir to swimmers.
What did the governor sign?
On August 31, 2026, Governor Gavin Newsom signed Senate Bill 1253, authored by state Sen. John Laird and sponsored by San Luis Obispo County. The measure creates a process under which the county may authorize swimming and certain other activities involving direct contact with the water, subject to public-health, water-quality and operational requirements. The lake supplies drinking water to the City of San Luis Obispo.
When could swimming begin?
In a September 4 announcement, the county said summer 2027 is the earliest anticipated possibility. Even that is not a firm opening date. The Board of Supervisors must consider whether to authorize new activities, and the county and City of San Luis Obispo must coordinate with public-health, public-safety and state drinking-water authorities. Approval from the State Water Resources Control Board’s Division of Drinking Water will be needed.
Which sports might be permitted?
The county says it is examining lower-impact options such as swimming, stand-up paddleboarding, windsurfing, sail or foil boarding and wading or float-tube fishing. Higher-impact uses such as waterskiing, wakeboarding, wakesurfing and tow-behind activities are not presently envisioned. These are potential activities under review, not permissions that visitors can exercise now.
What can visitors do now?
The county continues to list boating, kayaking, fishing and other presently authorized recreation. Its parks alerts distinguish existing boat-ramp access from future swimming proposals and advise visitors to comply with watercraft inspection requirements. Visitors should check current SLO County Parks notices before a trip. The park’s list of open facilities can change with conditions.
Why this matters to Santa Margarita
Expanded recreation may eventually attract additional day trips and support local businesses. But it would also require balancing drinking-water safety, shoreline conservation, visitor access and enforcement. Residents can follow hearings and provide feedback rather than assume the policy is finalized.
Primary sources: San Luis Obispo County, September 4, 2026 announcement; Senator Laird, August 31 SB 1253 announcement; SLO County Parks current conditions. This report does not announce a new swimming opening date.
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