印旛沼
Chiba, JapanView mapDirections
MOE publishes the water-quality measurements for 印旛沼. Here is what has been measured.
- Limited data
印旛沼 in Chiba, Japan has official water-quality measurements, shown as reported. Water clarity: 0.4 m visibility. Phosphorus: 130 µg/L.
How 印旛沼 is classified
印旛沼 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).
印旛沼 is a lake in Chiba 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 印旛沼 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 印旛沼
These are the measurements MOE publishes for 印旛沼. More on the source.
Very murky, less than 1.3 ft of visibility. Phosphorus 130 µg/L. TSI 74.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 0.4m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 130µg/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. | 74 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
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Frequently asked questions about 印旛沼
Where is 印旛沼?
- 印旛沼 is a lake in Chiba, Japan. This page reports official water-quality measurements, shown as reported.
What is the water quality of 印旛沼?
- 印旛沼 in Chiba, Japan has official water-quality measurements, shown as reported. Water clarity: 0.4 m visibility. Phosphorus: 130 µg/L.
Is 印旛沼 safe to swim in?
- 印旛沼 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
324 measurements from 4 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-jp324 samples · 2016–2025
Analytical methods
- MOE public water body monitoring (kosui, lakes)
Monitoring station identifiers (4)
1220010122002012200301220040
Authority classifications are shown as the authority published them. See where the data comes from and data sources.