Märkjärvi
Märkjärvi in Kouvola, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1 m visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 5.5 µg/L. Maximum depth: 8.2 ft.
- Clarity
- 1 m
- Max depth
- 2.5 m
Why Märkjärvi has no A–F grade
Märkjärvi 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 water clarity, phosphorus 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.
Märkjärvi is a lake in Kouvola County, Finland with a maximum depth of 8 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-08-05. 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 Märkjärvi
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 3.1 ft of visibility. Phosphorus level: 11 µg/L. Chlorophyll-a: 5.5 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.95 m | Not graded |
| Phosphorus | 11 µg/L | Not graded |
| Chlorophyll-a (Algae) | 5.5 µg/L | Not graded |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 2.5 m |
Where to stay near Märkjärvi
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Fishing Märkjärvi
Frequently asked questions about Märkjärvi
What is the water quality of Märkjärvi?
- Märkjärvi in Kouvola, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1 m visibility. Phosphorus: 11 µg/L. Chlorophyll-a (algae): 5.5 µg/L. Maximum depth: 8.2 ft.
Is Märkjärvi safe to swim in?
- Märkjärvi 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 Märkjärvi?
- Märkjärvi has a maximum depth of 8.2 feet.
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Where this data comes from
16 measurements from 1 monitoring station, 2018–2024. 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-vesla16 samples · 2018–2024
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
55816
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: 2024-08-05
Monitoring stations: 1