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Volunteer ‘First Flush’ monitoring finds widespread fecal‑indicator exceedances; some metal and phosphate hotspots flagged
Summary
The Resource Conservation District presented 2025 First Flush results showing enterococci exceedances across sampled sites, isolated sediment and metal spikes at several outfalls, and orthophosphate exceedances at five sites; RCD emphasized this is the program’s typical 'worst‑case' annual snapshot and recommended continued monitoring and targeted follow‑up at persistent hotspots.
The Resource Conservation District (RCD) presented the 2025 First Flush volunteer water‑quality results to the San Mateo County Harbor District on April 15.
Clifton Herman, who introduced himself as representing the RCD, said First Flush samples the first major rain of the wet season to capture runoff‑related contaminants that have accumulated over the dry months. Herman described the program as a long‑running community‑science effort with data back to 2008 and said the 2025 sampling event took place on Oct. 13 after an intense storm.
Key findings Herman highlighted: • Indicator bacteria: E. coli and enterococci were above…
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