相模湖
Kanagawa, JapanView mapDirections
MOE publishes the water-quality measurements for 相模湖. Here is what has been measured.
- Limited data
相模湖 in Kanagawa, Japan has official water-quality measurements, shown as reported. Water clarity: 2.5 m visibility. Phosphorus: 84 µg/L.
How 相模湖 is classified
相模湖 in Japan is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded water clarity and phosphorus, but not algae (chlorophyll-a).
LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is reported on this page.
Monitoring: the Ministry of the Environment (Japan).
相模湖 is a lake in Kanagawa County, Japan.
Source: the Ministry of the Environment (Japan) — not the EPA Water Quality Portal, last sampled 2025-03-15. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether 相模湖 is safe to swim in today is a call for the Ministry of the Environment (Japan) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for 相模湖
These are the measurements MOE publishes for 相模湖. More on the source.
Moderate clarity, visible to about 8.2 ft. Phosphorus 84 µg/L. TSI 57.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.5m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 84µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 57 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about 相模湖
Where is 相模湖?
- 相模湖 is a lake in Kanagawa, Japan. This page reports official water-quality measurements, shown as reported.
What is the water quality of 相模湖?
- 相模湖 in Kanagawa, Japan has official water-quality measurements, shown as reported. Water clarity: 2.5 m visibility. Phosphorus: 84 µg/L.
Is 相模湖 safe to swim in?
- 相模湖 has official nutrient and clarity measurements, not a bacteria swim class and not a safety clearance. Algal blooms, currents, and depth are not covered. Always check local notices before swimming.
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More lakes in Japan
Where this data comes from
171 measurements from 5 monitoring stations, 2016–2025. Retrieved from Japan MOE public water-body monitoring (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Ministry of the Environment (Japan)
moe-jp171 samples · 2016–2025
Analytical methods
- MOE public water body monitoring (kosui, lakes)
Monitoring station identifiers (5)
14201401420200142012014201301420150
Authority classifications are shown as the authority published them. See where the data comes from and data sources.