Observation

No claim effective interval recorded.

Spatial scope IDs: scope-lake-del-valle

1. Evidence stance: supports · Evidence details

   Del Valle beaches are sampled for bacteria weekly April-October and twice monthly November-March, with two sample sites per beach. Posted stop-light signs combine latest bacteriological tests and blue-green algae conditions.

   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

2. Evidence stance: supports · Evidence details

   EBRPD routinely monitors recreational and drinking water, storm water, wastewater, lakes and creeks, and responds to sewage, oil, and hazardous-material incidents. Natural swim areas are sampled weekly April-October in collaboration with county environmental-health departments, with current data posted for safe recreation choices.

   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