Petäjärvi
Petäjärvi in Kirkkonummi, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.4 m visibility. Phosphorus: 100 µg/L. Chlorophyll-a (algae): 83 µg/L. Maximum depth: 12.1 ft.
- Clarity
- 0.4 m
- Max depth
- 3.7 m
Why Petäjärvi has no A–F grade
Petäjärvi 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.
Petäjärvi is a lake in Kirkkonummi County, Finland with a maximum depth of 12 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-09-12. 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 Petäjärvi
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.3 ft of visibility. Phosphorus level: 100 µg/L. Chlorophyll-a: 83 µg/L. Trophic State Index: 73.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.4 m | Not graded |
| Phosphorus | 100 µg/L | Not graded |
| Chlorophyll-a (Algae) | 83 µg/L | Not graded |
| Trophic State Index (TSI) | 73 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 3.7 m |
Where to stay near Petäjärvi
Compare lakeside cabins, hotels, and vacation rentals near Petäjärvi in Kirkkonummi, 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 Petäjärvi
Frequently asked questions about Petäjärvi
What is the water quality of Petäjärvi?
- Petäjärvi in Kirkkonummi, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.4 m visibility. Phosphorus: 100 µg/L. Chlorophyll-a (algae): 83 µg/L. Maximum depth: 12.1 ft.
Is Petäjärvi safe to swim in?
- Petäjärvi 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 Petäjärvi?
- Petäjärvi has a maximum depth of 12.1 feet.
Explore Petäjärvi across LakeGrade
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Where this data comes from
91 measurements from 2 monitoring stations, 2016–2024. 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-vesla91 samples · 2016–2024
Analytical methods
- SYKE VESLA
Monitoring station identifiers (2)
5383269611
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: 2024-09-12
Monitoring stations: 2