Petäys Lake
Petäys Lake in Vihti, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.5 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 3 µg/L. Maximum depth: 29.5 ft.
- Clarity
- 2.5 m
- Max depth
- 9 m
Why Petäys Lake has no A–F grade
Petäys Lake 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.
Petäys Lake is a lake in Vihti County, Finland with a maximum depth of 30 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-08-03. 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 Petäys Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 8.2 ft. Phosphorus level: 10 µg/L. Chlorophyll-a: 3 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 m | Not graded |
| Phosphorus | 10 µg/L | Not graded |
| Chlorophyll-a (Algae) | 3 µg/L | Not graded |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 9 m |
Where to stay near Petäys Lake
Compare lakeside cabins, hotels, and vacation rentals near Petäys Lake in Vihti, 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 Petäys Lake
Frequently asked questions about Petäys Lake
What is the water quality of Petäys Lake?
- Petäys Lake in Vihti, Finland has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 2.5 m visibility. Phosphorus: 10 µg/L. Chlorophyll-a (algae): 3 µg/L. Maximum depth: 29.5 ft.
Is Petäys Lake safe to swim in?
- Petäys Lake 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 Petäys Lake?
- Petäys Lake has a maximum depth of 29.5 feet.
Explore Petäys Lake across LakeGrade
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Where this data comes from
8 measurements from 1 monitoring station, 2017–2022. 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-vesla8 samples · 2017–2022
Analytical methods
- SYKE VESLA
Monitoring station identifiers (1)
67443
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: 2022-08-03
Monitoring stations: 1