Ermistu Järv
Ermistu Järv in Pärnu, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.6 m visibility. Phosphorus: 23 µg/L. Chlorophyll-a (algae): 5.3 µg/L. Maximum depth: 12.1 ft. Surface area: 1117.9 acres.
- Clarity
- 1.6 m
- Max depth
- 3.7 m
- Area
- 452 ha
Why Ermistu Järv has no A–F grade
Ermistu 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).
Ermistu Järv is a 1,118-acre lake in Pärnu County, Estonia with a maximum depth of 12 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-09-19. 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 Ermistu Järv
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 5.2 ft. Phosphorus level: 23 µg/L. Chlorophyll-a: 5.3 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 m | Not graded |
| Phosphorus | 23 µg/L | Not graded |
| Chlorophyll-a (Algae) | 5.3 µg/L | Not graded |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 3.7 m |
| Surface Area | 452 ha |
Where to stay near Ermistu Järv
Compare lakeside cabins, hotels, and vacation rentals near Ermistu Järv in Pärnu, Estonia — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Ermistu Järv
Frequently asked questions about Ermistu Järv
What is the water quality of Ermistu Järv?
- Ermistu Järv in Pärnu, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.6 m visibility. Phosphorus: 23 µg/L. Chlorophyll-a (algae): 5.3 µg/L. Maximum depth: 12.1 ft. Surface area: 1117.9 acres.
Is Ermistu Järv safe to swim in?
- Ermistu 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 Ermistu Järv?
- Ermistu Järv has a maximum depth of 12.1 feet. The lake covers 1117.9 acres.
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Where this data comes from
28 measurements from 1 monitoring station, 2017–2023. 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 · 2017–2023
Analytical methods
- KESE I-level monitoring
Monitoring station identifiers (1)
SJA9911004
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: 2023-09-19
Monitoring stations: 1