Site-specific permit and access rules from the local dive center.
Blue Hole: clear spring sinkhole with year-round access
Blue Hole: clear spring sinkhole with year-round access
The Blue Hole is a spring-fed sinkhole pool in Santa Rosa with clear cold water, easy public access, and strong on-site support for training and casual dives. It is a good fit for open-water practice, snorkeling, and sightseeing, while the sealed cave system below stays off-limits to the public. Plan for altitude, permits, and a controlled visit rather than current or surge diving.
Conservative baseline from public research. No community dives logged yet.
Depth range, seasonality, and planning context.
Reported Depth
0m - 24.4m
Depth Note
Main pool is about 80 feet deep; the cave system below remains sealed off from public access.
Best Season
Year-round
Typical Conditions
Alkaline water with low aquatic life.
Site conditions, restrictions, and access requirements.
Site Conditions
Safety Notes
Use altitude-aware dive tables, respect permit rules, and do not enter the sealed cave system.
Access Restrictions
Diving requires permits, and the cave passages below are sealed off from the public.
Legal Notes
A current certification card is required for scuba, and a skin-diving permit is required for free diving or breath-hold diving.
Community notes to help plan your visit.
Scuba Diving
Clear cold water, a straightforward public entry, and altitude-aware planning make this a strong training site.
Freediving
Permitted with a skin-diving permit, but best for controlled sessions and experienced breath-hold divers.
Snorkeling
Good year-round snorkel stop thanks to the clear water, simple access, and public facilities.
Community dive logs and visit reports for this site.
Average conditions based on logged dives & visits.
Last Updated
Research Sources
Site-specific permit and access rules from the local dive center.
City tourism page for the Blue Hole dive site.
Community trip report used for visibility context.
Background on the sealed cave system and sinkhole structure.
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