Kosjärvi
Kosjärvi in Kouvola, Finland has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 32.5 µg/L. Maximum depth: 3.3 ft.
- Max depth
- 1 m
Why Kosjärvi has no A–F grade
Kosjärvi in Finland 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 Finnish Environment Institute (Syke) and the ELY Centres.
Kosjärvi is a lake in Kouvola County, Finland with a maximum depth of 3 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-03-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Kosjärvi
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 32.5 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 32.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 1 m |
Where to stay near Kosjärvi
Compare lakeside cabins, hotels, and vacation rentals near Kosjärvi in Kouvola, Finland — 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.
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Fishing Kosjärvi
Frequently asked questions about Kosjärvi
What is the water quality of Kosjärvi?
- Kosjärvi in Kouvola, Finland has official water-quality measurements, not a LakeQuality A–F grade. Phosphorus: 32.5 µg/L. Maximum depth: 3.3 ft.
Is Kosjärvi safe to swim in?
- Kosjärvi 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.
How deep is Kosjärvi?
- Kosjärvi has a maximum depth of 3.3 feet.
Explore Kosjärvi across LakeGrade
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Where this data comes from
2 measurements from 1 monitoring station, 2024–2025. Retrieved from Syke VESLA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Finnish Environment Institute (Syke) and ELY Centres
syke-vesla2 samples · 2024–2025
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
11487
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: 2025-03-20
Monitoring stations: 1