Where is Mäeküla Järv?

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

Is Mäeküla Järv safe to swim in?

Mäeküla 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 Mäeküla Järv?

Mäeküla Järv has a maximum depth of 12.5 feet. The lake covers 157.4 acres.

Mäeküla Järv

Viljandi, Estonia64 haView map Directions

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

Clarity

1.5 m

Typical for Estonia

Secchi · sampled 2025

Phosphorus

53.5 µg/L

More phosphorus than most

Measured by KAUR

Chlorophyll-a

21 µg/L

More algae than most

Measured by KAUR

Max depth

3.8 m

Bathymetric survey

Area

64 ha

Surface area

13 ft max depth
Limited data

See the measurements Directions Where to stay

Mäeküla Järv in Viljandi, Estonia has official water-quality measurements, shown as reported. Water clarity: 1.5 m visibility. Phosphorus: 53.5 µg/L. Chlorophyll-a (algae): 21 µg/L. Maximum depth: 12.5 ft. Surface area: 157.4 acres.

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How Mäeküla Järv is classified

Mäeküla 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).

Mäeküla Järv is a 157-acre lake in Viljandi County, Estonia with a maximum depth of 13 feet.

Source: the Estonian Environment Agency (Keskkonnaagentuur) — not the EPA Water Quality Portal, last sampled 2025-09-15. 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 Mäeküla 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 Mäeküla Järv

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

Murky, only visible to about 4.9 ft. Phosphorus 53.5 µg/L. Chlorophyll-a 21 µg/L. TSI 59.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	1.5m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	53.5µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	21µg/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.	59	Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic

High nutrients, frequent algae, reduced clarity

Ask about Mäeküla Järv

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

Lake Details

Max depth

3.8 m

Surface area

64 ha

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Fishing Mäeküla Järv

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

Frequently asked questions about Mäeküla Järv

Where is Mäeküla Järv?: Mäeküla Järv is a lake in Viljandi, Estonia. This page reports official water-quality measurements, shown as reported.
What is the water quality of Mäeküla Järv?: Mäeküla Järv in Viljandi, Estonia has official water-quality measurements, shown as reported. Water clarity: 1.5 m visibility. Phosphorus: 53.5 µg/L. Chlorophyll-a (algae): 21 µg/L. Maximum depth: 12.5 ft. Surface area: 157.4 acres.
Is Mäeküla Järv safe to swim in?: Mäeküla 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 Mäeküla Järv?: Mäeküla Järv has a maximum depth of 12.5 feet. The lake covers 157.4 acres.

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Where this data comes from

35 measurements from 2 monitoring stations, 2019–2025. 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-ee35 samples · 2019–2025

Analytical methods

KESE I-level monitoring

Monitoring station identifiers (2)

SJA0642000
SJA0642004

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