青木湖
Nagano, JapanView mapDirections
MOE publishes the water-quality measurements for 青木湖. Here is what has been measured.
- Limited data
青木湖 in Nagano, Japan has official water-quality measurements, shown as reported. Phosphorus: 4 µg/L.
How 青木湖 is classified
青木湖 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 phosphorus, but not water clarity and 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).
青木湖 is a lake in Nagano County, Japan.
Source: the Ministry of the Environment (Japan) — not the EPA Water Quality Portal, last sampled 2024-07-01. 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 青木湖 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 青木湖
These are the measurements MOE publishes for 青木湖. More on the source.
No clarity data. Phosphorus 4 µg/L. TSI 24.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 4µg/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. | 24 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
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Frequently asked questions about 青木湖
Where is 青木湖?
- 青木湖 is a lake in Nagano, Japan. This page reports official water-quality measurements, shown as reported.
What is the water quality of 青木湖?
- 青木湖 in Nagano, Japan has official water-quality measurements, shown as reported. Phosphorus: 4 µg/L.
Is 青木湖 safe to swim in?
- 青木湖 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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Where this data comes from
9 measurements from 1 monitoring station, 2016–2024. 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-jp9 samples · 2016–2024
Analytical methods
- MOE public water body monitoring (kosui, lakes)
Monitoring station identifiers (1)
2020160
Authority classifications are shown as the authority published them. See where the data comes from and data sources.