Herajärvi
Herajärvi in Joensuu, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 6.3 m visibility. Phosphorus: 3.7 µg/L. Chlorophyll-a (algae): 1.8 µg/L. Maximum depth: 72.2 ft.
- Clarity
- 6.3 m
- Max depth
- 22 m
Why Herajärvi has no A–F grade
Herajärvi 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.
Herajärvi is a lake in Joensuu County, Finland with a maximum depth of 72 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-09-07. 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 Herajärvi
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Crystal clear, you can see 20.7 ft down. Phosphorus level: 3.7 µg/L. Chlorophyll-a: 1.8 µg/L. Trophic State Index: 31.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.3 m | Not graded |
| Phosphorus | 3.7 µg/L | Not graded |
| Chlorophyll-a (Algae) | 1.8 µg/L | Not graded |
| Trophic State Index (TSI) | 31 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 22 m |
Where to stay near Herajärvi
Compare lakeside cabins, hotels, and vacation rentals near Herajärvi in Joensuu, 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.
Top-rated places to stay near Herajärvi
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Fishing Herajärvi
Frequently asked questions about Herajärvi
What is the water quality of Herajärvi?
- Herajärvi in Joensuu, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 6.3 m visibility. Phosphorus: 3.7 µg/L. Chlorophyll-a (algae): 1.8 µg/L. Maximum depth: 72.2 ft.
Is Herajärvi safe to swim in?
- Herajärvi 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 Herajärvi?
- Herajärvi has a maximum depth of 72.2 feet.
Explore Herajärvi across LakeGrade
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Where this data comes from
8 measurements from 1 monitoring station, 2021. 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-vesla8 samples · 2021
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
21771
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: 2021-09-07
Monitoring stations: 1