Iso Hietajärvi
Iso Hietajärvi in Posio, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.1 m visibility. Phosphorus: 6.1 µg/L. Chlorophyll-a (algae): 10.5 µg/L. Maximum depth: 40.7 ft.
- Clarity
- 3.1 m
- Max depth
- 12.4 m
Why Iso Hietajärvi has no A–F grade
Iso Hietajärvi 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.
Iso Hietajärvi is a lake in Posio County, Finland with a maximum depth of 41 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-09-12. 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 Iso Hietajärvi
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 10 ft. Phosphorus level: 6.1 µg/L. Chlorophyll-a: 10.5 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.05 m | Not graded |
| Phosphorus | 6.1 µg/L | Not graded |
| Chlorophyll-a (Algae) | 10.5 µg/L | Not graded |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 12.4 m |
Where to stay near Iso Hietajärvi
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Fishing Iso Hietajärvi
Frequently asked questions about Iso Hietajärvi
What is the water quality of Iso Hietajärvi?
- Iso Hietajärvi in Posio, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.1 m visibility. Phosphorus: 6.1 µg/L. Chlorophyll-a (algae): 10.5 µg/L. Maximum depth: 40.7 ft.
Is Iso Hietajärvi safe to swim in?
- Iso Hietajärvi 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 Iso Hietajärvi?
- Iso Hietajärvi has a maximum depth of 40.7 feet.
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Where this data comes from
10 measurements from 1 monitoring station, 2022. 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-vesla10 samples · 2022
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
36162
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: 2022-09-12
Monitoring stations: 1