Lohja Järv
Lohja Järv in Harju, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.6 m visibility. Phosphorus: 98 µg/L. Chlorophyll-a (algae): 29 µg/L. Maximum depth: 10.8 ft. Surface area: 138.1 acres.
- Clarity
- 0.6 m
- Max depth
- 3.3 m
- Area
- 56 ha
Why Lohja Järv has no A–F grade
Lohja 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).
Lohja Järv is a 138-acre lake in Harju County, Estonia with a maximum depth of 11 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-09-18. 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 Lohja Järv
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.8 ft of visibility. Phosphorus level: 98 µg/L. Chlorophyll-a: 29 µg/L. Trophic State Index: 68.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.55 m | Not graded |
| Phosphorus | 98 µg/L | Not graded |
| Chlorophyll-a (Algae) | 29 µg/L | Not graded |
| Trophic State Index (TSI) | 68 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 3.3 m |
| Surface Area | 56 ha |
Where to stay near Lohja Järv
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Fishing Lohja Järv
Frequently asked questions about Lohja Järv
What is the water quality of Lohja Järv?
- Lohja Järv in Harju, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.6 m visibility. Phosphorus: 98 µg/L. Chlorophyll-a (algae): 29 µg/L. Maximum depth: 10.8 ft. Surface area: 138.1 acres.
Is Lohja Järv safe to swim in?
- Lohja 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 Lohja Järv?
- Lohja Järv has a maximum depth of 10.8 feet. The lake covers 138.1 acres.
Explore Lohja Järv across LakeGrade
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Where this data comes from
24 measurements from 2 monitoring stations, 2020–2025. 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-ee24 samples · 2020–2025
Analytical methods
- KESE I-level monitoring
Monitoring station identifiers (2)
SJA1341003SJA1341000
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: 2025-09-18
Monitoring stations: 2