Drew Lake: toxic algae advisories
Drew Lake, Santa Cruz County. See all Santa Cruz County waters.
What the state's records say
The state's latest record, from May 15, 2026, recommends no advisory.
Last advisory on file: Aug 20, 2025.
That reflects what the state knew on that date. It is not a finding that the water is safe now: blooms can return within days, and many are never reported.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Drew Lake
The state's latest record, from May 15, 2026, recommends no advisory. For Drew Lake, that is not the same as an all-clear for today. Look at the water before your dog goes in: keep it out of green, blue-green or scummy water and away from mats on the shore.
Reported spots
The state records each report at a spot, such as a beach or a boat ramp. Each spot's latest deciding record:
| Spot | Status |
|---|---|
| DREW-1 | The state's latest record, from May 15, 2026, recommends no advisory. |
Advisory history
Every advisory record the state has published for Drew Lake, newest first. "None" is the state's record that no advisory was recommended on that date. "NA" records do not change a status.
| Date | Spot | State's level | Notes |
|---|---|---|---|
| May 15, 2026 | DREW-1 | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 29, 2025 | DREW-1 | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 21, 2025 | DREW-1 | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 15, 2025 | DREW-1 | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 8, 2025 | DREW-1 | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Oct 1, 2025 | DREW-1 | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 24, 2025 | DREW-1 | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 16, 2025 | DREW-1 | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 11, 2025 | DREW-1 | None | Lake-wide advisory; Updates from routine monitoring program-organization |
| Sep 4, 2025 | DREW-1 | None | Updates from routine monitoring program-organization |
| Aug 27, 2025 | DREW-1 | None | Updates from routine monitoring program-organization |
| Aug 20, 2025 | DREW-1 | Caution | Updates from routine monitoring program-organization |
| Aug 14, 2025 | DREW-1 | Caution | Updates from routine monitoring program-organization |
| Aug 7, 2025 | DREW-1 | None | Updates from routine monitoring program-organization |
| Jul 31, 2025 | DREW-1 | None | Updates from routine monitoring program-organization |
| Jul 24, 2025 | DREW-1 | None | Updates from routine monitoring program-organization |
| Jul 9, 2025 | DREW-1 | None | Updates from routine monitoring program-organization |
| Jun 26, 2025 | DREW-1 | None | Updates from routine monitoring program-organization |
| Jun 11, 2025 | DREW-1 | None | Updates from routine monitoring program-organization |
Source
Advisory data: California State Water Resources Control Board, Freshwater Harmful Algal Bloom Program, via data.ca.gov (public domain). Advisories are recommendations; reporting is voluntary and incomplete. The state's data. An advisory ends only when the state records a later "None" (no advisory recommended) at the same spot, or an end date. A blank end date is unknown.