Which activities are allowed or prohibited at each EBRPD algae advisory level?

This page gives general health guidance but does not define the operational rules for Caution versus Danger; the linked beach-conditions material is still needed.

Open question. The following evidence does not resolve this gap. Use the recorded question and reason to understand what needs confirmation.

Claims and evidence

Swimming advisory

caution

Evidence and sources (4)

Claim effective interval: 2026-09-20 to 2026-09-20

Spatial scope IDs: scope-del-valle-east-beach

Evidence stance: supports · Evidence details
At retrieval, the EBRPD page posted a blue-green algae Caution Advisory for the East Swim Beach and stated that the West Swim Beach had no water because of low lake levels.
Publisher
East Bay Regional Park District
Observer / attribution
user-supplied page transcription
Observed at
2026-09-20T00:00:00+00:00
Retrieved at
2026-09-20T00:00:00+00:00
Retrieval time does not establish when an event occurred.
Observation details · Source details · Original source: East Bay Regional Park District
Evidence stance: supports · Evidence details
At retrieval, the current-conditions table listed a Caution Advisory for the Del Valle East Swim Beach and no advisory for the West Swim Beach, where it reported no water because of low lake levels.
Publisher
East Bay Regional Park District
Observer / attribution
user-supplied page transcription
Observed at
2026-09-20T00:00:00+00:00
Retrieved at
2026-09-20T00:00:00+00:00
Retrieval time does not establish when an event occurred.
Observation details · Source details · Original source: East Bay Regional Park District
Evidence stance: supports · Evidence details
At retrieval, East Beach had a blue-green algae Caution Advisory and West Beach had no water because of low lake levels.
Publisher
East Bay Regional Park District
Observer / attribution
user-supplied page transcription
Observed at
2026-09-20T00:00:00+00:00
Retrieved at
2026-09-20T00:00:00+00:00
Retrieval time does not establish when an event occurred.
Observation details · Source details · Original source: East Bay Regional Park District
Evidence stance: supports · Evidence details
At retrieval, the table listed a Caution algae advisory at Del Valle East Beach and no advisory at West Beach, where there was no water because of low lake levels.
Publisher
East Bay Regional Park District
Observer / attribution
user-supplied page transcription
Observed at
2026-09-20T00:00:00+00:00
Retrieved at
2026-09-20T00:00:00+00:00
Retrieval time does not establish when an event occurred.
Observation details · Source details · Original source: East Bay Regional Park District

Advisory fish guidance

Avoid unnecessary water contact: Yes
Cook thoroughly: Yes
Discard guts and liver: Yes
Wash fillet with safe water: Yes
Wash hands after wet contact: Yes

Evidence and sources (1)

No claim effective interval recorded.

Spatial scope IDs: scope-ebrpd-water-quality-program

Evidence stance: supports · Evidence details
During an algae advisory, EBRPD advises avoiding unnecessary water contact and washing hands after handling fish or wet equipment. Fish fillets should be washed with tap or bottled water, guts and liver discarded, and fish cooked thoroughly. Reservoir fish are tested annually; at retrieval the page reported no microcystin detected to date in fish flesh from District-managed waters.
Publisher
East Bay Regional Park District
Observer / attribution
user-supplied page transcription
Observed at
2026-09-20T00:00:00+00:00
Retrieved at
2026-09-20T00:00:00+00:00
Retrieval time does not establish when an event occurred.
Observation details · Source details · Original source: East Bay Regional Park District

Dog exposure risk

High susceptibility

Yes

Routes

drinking
swimming
wading
grooming fur or paws
eating dried shoreline algae

Evidence and sources (1)

No claim effective interval recorded.

Spatial scope IDs: scope-ebrpd-water-quality-program

Evidence stance: supports · Evidence details
Exposure to toxic algae by ingestion, inhalation, or skin contact can cause rashes, eye or skin irritation, allergic reactions, breathing difficulty or congestion, gastrointestinal illness, and in high exposures serious illness or death. Dogs face special risk from drinking, swimming, wading, grooming contaminated fur or paws, or eating dried shoreline algae.
Publisher
East Bay Regional Park District
Observer / attribution
user-supplied page transcription
Observed at
Unknown
Retrieved at
2026-09-20T00:00:00+00:00
Retrieval time does not establish when an event occurred.
Observation details · Source details · Original source: East Bay Regional Park District

Human exposure risk

Effects

rash
skin eye irritation
allergic reaction
breathing difficulty
congestion
gastrointestinal illness
serious illness
death

Routes

ingestion
inhalation
skin contact

Evidence and sources (1)

No claim effective interval recorded.

Spatial scope IDs: scope-ebrpd-water-quality-program

Evidence stance: supports · Evidence details
Exposure to toxic algae by ingestion, inhalation, or skin contact can cause rashes, eye or skin irritation, allergic reactions, breathing difficulty or congestion, gastrointestinal illness, and in high exposures serious illness or death. Dogs face special risk from drinking, swimming, wading, grooming contaminated fur or paws, or eating dried shoreline algae.
Publisher
East Bay Regional Park District
Observer / attribution
user-supplied page transcription
Observed at
Unknown
Retrieved at
2026-09-20T00:00:00+00:00
Retrieval time does not establish when an event occurred.
Observation details · Source details · Original source: East Bay Regional Park District

Recorded observations

Browse observations separately (6)

At retrieval, the EBRPD page posted a blue-green algae Caution Advisory for the East Swim Beach and stated that the West Swim Beach had no water because of low lake levels.

Publisher: East Bay Regional Park District
Observer / attribution: user-supplied page transcription
Observed at: 2026-09-20T00:00:00+00:00
Retrieved at: 2026-09-20T00:00:00+00:00