Water Quality at GRUTTE WIELEN, LEEUWARDEN
This data reflects historical water quality classifications and is not a real-time safety assessment. Water quality can change rapidly due to weather, sewage events, or algae blooms. Always check with local authorities or lifeguard stations before swimming.
Safe to swim
This bathing water meets EU quality standards. Low levels of bacterial contamination within safe limits.
Based on 2024 bathing season data
Source: European Environment Agency / EU Bathing Water Directive (2006/7/EC)
Latest Measurements
Sample date: 2024-09-16
5-Year Quality Trend
Season Monitoring Results
| Date | Enterococci | E. coli |
|---|---|---|
| 2024-09-16 | 20 | 50 |
| 2024-09-02 | 20 | 50 |
| 2024-08-19 | 15 | 30 |
| 2024-08-05 | 15 | 15 |
| 2024-07-22 | 350 | 80 |
| 2024-07-08 | 15 | 15 |
| 2024-06-24 | 30 | 50 |
| 2024-06-10 | 110 | 30 |
| 2024-05-27 | 30 | 50 |
| 2024-05-13 | 60 | 50 |
| 2024-04-29 | 15 | 80 |
Values in cfu/100ml (colony-forming units per 100ml)
What are E. coli and enterococci?
E. coli and intestinal enterococci are indicator bacteria for fecal contamination. Their presence suggests sewage or animal waste in the water, which may contain harmful pathogens. The EU Bathing Water Directive (2006/7/EC) classifies water quality based on these two indicators.
Beach Info
- Country
- 🇳🇱 Netherlands
- Water Type
- lake
- Bathing Season
- May - September
- ID
- NLBW02_9013