Where is Harku Järv?

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

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.

Harku Järv

Harju, Estonia165 haView map Directions

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

Clarity

0.4 m

Murkier than most

Secchi · sampled 2024

Phosphorus

130 µg/L

More phosphorus than most

Measured by KAUR

Chlorophyll-a

125 µg/L

More algae than most

Measured by KAUR

Max depth

2.6 m

Bathymetric survey

Area

165 ha

Surface area

9 ft max depth
Limited data

See the measurements Directions Where to stay

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

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How Harku Järv is classified

Harku 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).

Harku Järv is a 407-acre lake in Harju County, Estonia with a maximum depth of 9 feet.

Source: the Estonian Environment Agency (Keskkonnaagentuur) — not the EPA Water Quality Portal, last sampled 2024-09-18. 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 Harku 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 Harku Järv

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

Very murky, less than 1.1 ft of visibility. Phosphorus 130 µg/L. Chlorophyll-a 125 µg/L. TSI 76.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	0.35m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	130µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	125µg/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.	76	Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic

Very high nutrients, dense algae, poor clarity

Ask about Harku Järv

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

Lake Details

Max depth

2.6 m

Surface area

165 ha

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Fishing Harku Järv

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

Frequently asked questions about Harku Järv

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

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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)

SJA5797000
SJA5797003

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