Zirga Ezers

Latvia Lake 1 - Excellent

Zirga Lake is an inland water body in Latvia used for bathing and recreation. Water quality is assessed according to EU Directive 2006/7/EK requirements using microbiological indicators and monitoring for cyanobacteria blooms. The bathing water profile was developed to analyze factors affecting water quality and implement management measures to maintain at least adequate quality standards.

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Water

Inland lake (Zirga Lake) in Latvia. Water quality assessment covers four seasons of monitoring data using statistical analysis criteria for long-term evaluation.

Water Quality

Water quality classification follows a four-tier scale: excellent quality, good quality, adequate quality, and poor quality. Assessment is based on faecal contamination indicators: Escherichia coli and intestinal enterococci. Monitoring includes operational assessment after each sampling and long-term quality assessment to identify persistent risks. Excellent quality threshold for enterococci is 200 CFU/100 ml (95th percentile) and for E. coli is 500 CFU/100 ml (95th percentile).

Risks

Faecal contamination from inadequately treated wastewater and cyanobacteria mass blooms. Diffuse pollution from urbanized areas, traffic, and agricultural land use. Pollution risk related to centralized wastewater collection and treatment systems and populations not connected to centralized systems.