伊豆沼
伊豆沼 in Miyagi, Japan has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 98 µg/L.
Why 伊豆沼 has no A–F grade
伊豆沼 in Japan is published with the authority's own measurements, not a LakeQuality letter. official authority class; not a LakeQuality A–F letter Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
A letter on the LakeQuality scale would be an invention, not an official class. Everything below that has been measured is still reported on this page.
Monitoring: the Ministry of the Environment (Japan).
伊豆沼 is a lake in Miyagi County, Japan.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-07-01. Grade methodology: LakeGrade methodology.
Watch 伊豆沼 water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for 伊豆沼
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 98 µg/L. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 98 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 70 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near 伊豆沼
Compare lakeside cabins, hotels, and vacation rentals near 伊豆沼 in Miyagi, Japan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near 伊豆沼
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Fishing 伊豆沼
Frequently asked questions about 伊豆沼
What is the water quality of 伊豆沼?
- 伊豆沼 in Miyagi, Japan has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 98 µg/L.
Is 伊豆沼 safe to swim in?
- 伊豆沼 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.
Explore 伊豆沼 across LakeGrade
More lakes in Japan
Where this data comes from
27 measurements from 3 monitoring stations, 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-jp27 samples · 2016–2024
Analytical methods
- MOE public water body monitoring (kosui, lakes)
Monitoring station identifiers (3)
042022004203800420410
Authority classifications are stored separately from LakeQuality A–F letters and are never blended. See methodology and data sources.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2024-07-01
Monitoring stations: 3