Where is Usmas Ezers?

Usmas Ezers is a lake in Latvia. This page reports official water-quality measurements, shown as reported.

Is Usmas Ezers safe to swim in?

Usmas Ezers 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.

Usmas Ezers

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LEGMC publishes the water-quality measurements for Usmas Ezers. Here is what has been measured.

Clarity

2.2 m

Typical for Latvia

Secchi · sampled 2023

Phosphorus

16 µg/L

Less phosphorus than most

Measured by LEGMC

Chlorophyll-a

4.7 µg/L

Less algae than most

Measured by LEGMC

Limited data

See the measurements Directions Where to stay

Usmas Ezers in Latvia has official water-quality measurements, shown as reported. Water clarity: 2.2 m visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 4.7 µg/L.

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How Usmas Ezers is classified

Usmas Ezers in Latvia 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 Latvian Environment, Geology and Meteorology Centre, via UNEP GEMS/Water.

Usmas Ezers is a lake in Unknown County, Latvia.

Source: the Latvian Environment, Geology and Meteorology Centre, via UNEP GEMS/Water — not the EPA Water Quality Portal, last sampled 2023-10-10. 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 Usmas Ezers is safe to swim in today is a call for the Latvian Environment, Geology and Meteorology Centre, via UNEP GEMS/Water and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Usmas Ezers

These are the measurements LEGMC publishes for Usmas Ezers. More on the source.

Moderate clarity, visible to about 7.1 ft. Phosphorus 16 µg/L. Chlorophyll-a 4.7 µg/L. TSI 46.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	2.15m	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus	16µg/L	Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)	4.7µg/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.	46	Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Moderate nutrients, good water quality

Ask about Usmas Ezers

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

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Fishing Usmas Ezers

→ Usmas Ezers fishing regulations (limits, seasons, special rules)

Frequently asked questions about Usmas Ezers

Where is Usmas Ezers?: Usmas Ezers is a lake in Latvia. This page reports official water-quality measurements, shown as reported.
What is the water quality of Usmas Ezers?: Usmas Ezers in Latvia has official water-quality measurements, shown as reported. Water clarity: 2.2 m visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 4.7 µg/L.
Is Usmas Ezers safe to swim in?: Usmas Ezers 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.

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Where this data comes from

17 measurements from 1 monitoring station, 2017–2023. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-16.

Collected and reported by

European Environment Agencyeuropeanenvironmentagenc17 samples · —

Analytical methods

GEMStat OPEN / CC BY 4.0

Monitoring station identifiers (1)

LVA00093

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