Beach Water Quality Samples from Marin County, CA, 2017 Onward

Weekly water samples collected at beaches in Marin County, California, starting the week of May 29, 2017. The data contains results for Total Coliform, E. coli, and Enterococcus bacteria, with advisories posted when recreational standards are exceeded. It is published by data.marincounty.gov, with samples typically collected from April through October each year.

Use Cases

• Identify beaches with elevated bacteria levels using the Result, Beach, and Sample Week columns.
• Map water quality trends over time using Sample Week, Latitude, and Longitude columns.
• Correlate sample results with specific locations using the Beach, Location (address), and Zip Code columns.
• Analyze seasonal patterns in water quality using the Sample Week and Result columns from the weekly time series.

Strengths

• Includes precise geospatial coordinates (Latitude, Longitude) for each sample location.
• Provides a multi-year weekly time series starting from a specific date (May 29, 2017).
• Contains multiple bacterial indicator measurements (Total Coliform, E. coli, Enterococcus) per sample.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Sample collection is seasonal (April-October), leaving gaps in annual coverage.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

data.marincounty.gov

Collection Method

Weekly water samples collected and analyzed for bacterial indicators.

Time Range

Weekly samples from the week of May 29, 2017 onward, collected annually April through October.

Freshness

Last updated 2026-05-22 15:29:49; freshness should be verified.

Geography

Beaches in Marin County, California, USA.