Ähijärv
Ähijärv in Valga, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.9 m visibility. Phosphorus: 31.5 µg/L. Chlorophyll-a (algae): 12 µg/L. Maximum depth: 20.7 ft. Surface area: 452 acres.
- Clarity
- 1.9 m
- Max depth
- 6.3 m
- Area
- 183 ha
Why Ähijärv has no A–F grade
Ähijärv 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).
Ähijärv is a 452-acre lake in Valga County, Estonia with a maximum depth of 21 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-09-08. 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 Ähijärv
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Murky, only visible to about 6.2 ft. Phosphorus level: 31.5 µg/L. Chlorophyll-a: 12 µg/L. Trophic State Index: 53.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.9 m | Not graded |
| Phosphorus | 31.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 12 µg/L | Not graded |
| Trophic State Index (TSI) | 53 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 6.3 m |
| Surface Area | 183 ha |
Where to stay near Ähijärv
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Fishing Ähijärv
Frequently asked questions about Ähijärv
What is the water quality of Ähijärv?
- Ähijärv in Valga, Estonia has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 1.9 m visibility. Phosphorus: 31.5 µg/L. Chlorophyll-a (algae): 12 µg/L. Maximum depth: 20.7 ft. Surface area: 452 acres.
Is Ähijärv safe to swim in?
- Ähijärv 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 Ähijärv?
- Ähijärv has a maximum depth of 20.7 feet. The lake covers 452 acres.
Explore Ähijärv across LakeGrade
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Where this data comes from
212 measurements from 2 monitoring stations, 2016–2025. 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-ee212 samples · 2016–2025
Analytical methods
- KESE I-level monitoring
Monitoring station identifiers (2)
SJA5001000SJA5001004
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: 2025-09-08
Monitoring stations: 2