Harku Järv
Harku Järv in Harju, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.4 m visibility. Phosphorus: 130 µg/L. Chlorophyll-a (algae): 125 µg/L. Maximum depth: 8.5 ft. Surface area: 407.2 acres.
- Clarity
- 0.4 m
- Max depth
- 2.6 m
- Area
- 165 ha
Why Harku Järv has no A–F grade
Harku Järv in Estonia 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 Estonian Environment Agency (Keskkonnaagentuur).
Harku Järv is a 407-acre lake in Harju County, Estonia with a maximum depth of 9 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-09-18. 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 Harku Järv
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.1 ft of visibility. Phosphorus level: 130 µg/L. Chlorophyll-a: 125 µg/L. Trophic State Index: 76.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.35 m | Not graded |
| Phosphorus | 130 µg/L | Not graded |
| Chlorophyll-a (Algae) | 125 µg/L | Not graded |
| Trophic State Index (TSI) | 76 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 2.6 m |
| Surface Area | 165 ha |
Where to stay near Harku Järv
Compare lakeside cabins, hotels, and vacation rentals near Harku Järv in Harju, Estonia — 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 Harku Järv
Frequently asked questions about Harku Järv
What is the water quality of Harku Järv?
- Harku Järv in Harju, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.4 m visibility. Phosphorus: 130 µg/L. Chlorophyll-a (algae): 125 µg/L. Maximum depth: 8.5 ft. Surface area: 407.2 acres.
Is Harku Järv safe to swim in?
- Harku Järv 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 Harku Järv?
- Harku Järv has a maximum depth of 8.5 feet. The lake covers 407.2 acres.
Explore Harku Järv across LakeGrade
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Where this data comes from
28 measurements from 2 monitoring stations, 2021–2024. Retrieved from KESE / Estonian Environment Agency (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Estonian Environment Agency (Keskkonnaagentuur)
kese-ee28 samples · 2021–2024
Analytical methods
- KESE I-level monitoring
Monitoring station identifiers (2)
SJA5797000SJA5797003
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: 2024-09-18
Monitoring stations: 2