Lake Zirahuen
Lake Zirahuen in Unknown, Mexico has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.2 m visibility. Phosphorus: 577 µg/L. Chlorophyll-a (algae): 2.3 µg/L.
- Clarity
- 3.2 m
Why Lake Zirahuen has no A–F grade
Lake Zirahuen in Mexico 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 National Water Commission of Mexico (CONAGUA), via UNEP GEMS/Water.
Lake Zirahuen is a lake in Unknown County, Mexico.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-09-28. 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 Lake Zirahuen
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Good clarity, visible to about 10.3 ft. Phosphorus level: 577 µg/L. Chlorophyll-a: 2.3 µg/L. Trophic State Index: 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.15 m | Not graded |
| Phosphorus | 577 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2.3 µg/L | Not graded |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Zirahuen
Compare lakeside cabins, hotels, and vacation rentals near Lake Zirahuen in Unknown, Mexico — 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 Lake Zirahuen
Frequently asked questions about Lake Zirahuen
What is the water quality of Lake Zirahuen?
- Lake Zirahuen in Unknown, Mexico has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 3.2 m visibility. Phosphorus: 577 µg/L. Chlorophyll-a (algae): 2.3 µg/L.
Is Lake Zirahuen safe to swim in?
- Lake Zirahuen 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
44 measurements from 2 monitoring stations, 2016–2021. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Comisión Nacional del Agua
comisionnacionaldelagua44 samples · —
Analytical methods
- GEMStat OPEN / CC BY 4.0
Monitoring station identifiers (2)
MEX01372MEX01374
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: 2021-09-28
Monitoring stations: 2