Suurijärvi
Suurijärvi in Heinola, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 4 m visibility. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 4.3 µg/L.
- Clarity
- 4 m
Why Suurijärvi has no A–F grade
Suurijärvi 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.
Suurijärvi is a lake in Heinola County, Finland.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2026-07-27. 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 Suurijärvi
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 13 ft. Phosphorus level: 5 µg/L. Chlorophyll-a: 4.3 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.95 m | Not graded |
| Phosphorus | 5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4.3 µg/L | Not graded |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Suurijärvi
Compare lakeside cabins, hotels, and vacation rentals near Suurijärvi in Heinola, 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 Suurijärvi
Frequently asked questions about Suurijärvi
What is the water quality of Suurijärvi?
- Suurijärvi in Heinola, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 4 m visibility. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 4.3 µg/L.
Is Suurijärvi safe to swim in?
- Suurijärvi 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 Suurijärvi across LakeGrade
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Where this data comes from
6 measurements from 1 monitoring station, 2019–2026. 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-vesla6 samples · 2019–2026
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
68745
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: 2026-07-27
Monitoring stations: 1