Chapala Lake
Chapala Lake in Unknown, Mexico has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.4 m visibility. Phosphorus: 448.1 µg/L. Chlorophyll-a (algae): 4.3 µg/L.
- Clarity
- 0.4 m
Why Chapala Lake has no A–F grade
Chapala Lake 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.
Chapala Lake is a lake in Unknown County, Mexico.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-10-14. 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 Chapala Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.4 ft of visibility. Phosphorus level: 448.1 µg/L. Chlorophyll-a: 4.3 µg/L. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.44 m | Not graded |
| Phosphorus | 448.1 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4.3 µg/L | Not graded |
| Trophic State Index (TSI) | 70 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Chapala Lake
Compare lakeside cabins, hotels, and vacation rentals near Chapala Lake 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 Chapala Lake
Frequently asked questions about Chapala Lake
What is the water quality of Chapala Lake?
- Chapala Lake in Unknown, Mexico has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.4 m visibility. Phosphorus: 448.1 µg/L. Chlorophyll-a (algae): 4.3 µg/L.
Is Chapala Lake safe to swim in?
- Chapala Lake 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
51 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
comisionnacionaldelagua51 samples · —
Analytical methods
- GEMStat OPEN / CC BY 4.0
Monitoring station identifiers (2)
MEX03068MEX03072
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: 2021-10-14
Monitoring stations: 2