Where is Lohja Järv?

Lohja Järv is a lake in Harju, Estonia. This page reports official water-quality measurements, shown as reported.

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.

Lohja Järv

Harju, Estonia56 haView map Directions

KAUR publishes the water-quality measurements for Lohja Järv. Here is what has been measured.

Clarity

0.6 m

Murkier than most

Secchi · sampled 2025

Phosphorus

98 µg/L

More phosphorus than most

Measured by KAUR

Chlorophyll-a

29 µg/L

More algae than most

Measured by KAUR

Max depth

3.3 m

Bathymetric survey

Area

56 ha

Surface area

11 ft max depth
Limited data

See the measurements Directions Where to stay

Lohja Järv in Harju, Estonia has official water-quality measurements, shown as reported. 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.

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How Lohja Järv is classified

Lohja Järv in Estonia is published with the authority's own measurements and class. The measurements here are published by the agency that samples the lake, as reported. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).

LakeQuality publishes no grade of its own beside it. Everything below thathas been measured is 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: the Estonian Environment Agency (Keskkonnaagentuur) — not the EPA Water Quality Portal, last sampled 2025-09-18. Methodology: how these readings are compared.

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Lohja Järv is safe to swim in today is a call for the Estonian Environment Agency (Keskkonnaagentuur) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Lohja Järv

These are the measurements KAUR publishes for Lohja Järv. More on the source.

Very murky, less than 1.8 ft of visibility. Phosphorus 98 µg/L. Chlorophyll-a 29 µg/L. TSI 68.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	0.55m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	98µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	29µg/L	Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	68	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Lohja Järv

Answers come straight from the public measurements and survey records on this page.

Lake Details

Max depth

3.3 m

Surface area

56 ha

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Fishing Lohja Järv

→ Lohja Järv fishing regulations (limits, seasons, special rules)

Frequently asked questions about Lohja Järv

Where is Lohja Järv?: Lohja Järv is a lake in Harju, Estonia. This page reports official water-quality measurements, shown as reported.
What is the water quality of Lohja Järv?: Lohja Järv in Harju, Estonia has official water-quality measurements, shown as reported. 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.

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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)

SJA1341003
SJA1341000

Authority classifications are shown as the authority published them. See where the data comes from and data sources.