Bathing waters: new directive, new standards, new quality approach.

Area of Science:

• Environmental microbiology
• Public health
• Water quality monitoring

Background:

• Bathing water quality is crucial for public health, primarily due to fecal contamination.
• European Commission (EC) adopted a new directive in 2006 for recreational waters, reducing key bacterial indicators.
• The new directive replaced the 1976 EC Bathing Water Directive policies.

Purpose of the Study:

• To assess the equivalency of new bacteriological parameters with older ones in Portugal.
• To align Portuguese bathing water monitoring practices with international developments.
• To validate the reduced set of bacterial indicators for routine beach monitoring.

Main Methods:

• Surveyed water quality at 25 coastal beaches in Portugal.
• Utilized both new (Escherichia coli, intestinal enterococci) and old (fecal coliforms, fecal streptococci) microbiological indicators.
• Performed statistical analysis to compare results from different indicators.

Main Results:

• Statistical analysis confirmed the equivalency between fecal coliforms and Escherichia coli.
• Demonstrated equivalency between fecal streptococci and intestinal enterococci.
• Validated the use of the two new bacterial indicators for monitoring.

Conclusions:

• The new bacteriological parameters (Escherichia coli, intestinal enterococci) are equivalent to the old ones for bathing water quality assessment.
• Portugal's monitoring practices are aligned with the updated European Commission directive.
• The study supports the reduced laboratory testing for routine beach monitoring.