牛久沼
Ibaraki, JapanView mapDirections
MOE publishes the water-quality measurements for 牛久沼. Here is what has been measured.
- Limited data
牛久沼 in Ibaraki, Japan has official water-quality measurements, shown as reported. Water clarity: 0.5 m visibility. Phosphorus: 79 µg/L.
How 牛久沼 is classified
牛久沼 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).
牛久沼 is a lake in Ibaraki 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 牛久沼 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 牛久沼
These are the measurements MOE publishes for 牛久沼. More on the source.
Very murky, less than 1.6 ft of visibility. Phosphorus 79 µg/L. TSI 69.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 0.5m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 79µg/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. | 69 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Frequently asked questions about 牛久沼
Where is 牛久沼?
- 牛久沼 is a lake in Ibaraki, Japan. This page reports official water-quality measurements, shown as reported.
What is the water quality of 牛久沼?
- 牛久沼 in Ibaraki, Japan has official water-quality measurements, shown as reported. Water clarity: 0.5 m visibility. Phosphorus: 79 µg/L.
Is 牛久沼 safe to swim in?
- 牛久沼 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
81 measurements from 1 monitoring station, 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-jp81 samples · 2016–2025
Analytical methods
- MOE public water body monitoring (kosui, lakes)
Monitoring station identifiers (1)
0820260
Authority classifications are shown as the authority published them. See where the data comes from and data sources.