Cerro Prieto Reservoir
Cerro Prieto Reservoir in Unknown, Mexico has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.5 m visibility. Phosphorus: 19.3 µg/L. Chlorophyll-a (algae): 1 µg/L.
- Clarity
- 0.5 m
Why Cerro Prieto Reservoir has no A–F grade
Cerro Prieto Reservoir 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.
Cerro Prieto Reservoir is a lake in Unknown County, Mexico.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2021-09-16. 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 Cerro Prieto Reservoir
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.7 ft of visibility. Phosphorus level: 19.3 µg/L. Chlorophyll-a: 1 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.52 m | Not graded |
| Phosphorus | 19.3 µg/L | Not graded |
| Chlorophyll-a (Algae) | 1 µg/L | Not graded |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Cerro Prieto Reservoir
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Fishing Cerro Prieto Reservoir
Frequently asked questions about Cerro Prieto Reservoir
What is the water quality of Cerro Prieto Reservoir?
- Cerro Prieto Reservoir in Unknown, Mexico has official water-quality measurements, not a LakeQuality A–F grade. Water clarity: 0.5 m visibility. Phosphorus: 19.3 µg/L. Chlorophyll-a (algae): 1 µg/L.
Is Cerro Prieto Reservoir safe to swim in?
- Cerro Prieto Reservoir 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
13 measurements from 1 monitoring station, 2017–2021. Retrieved from UNEP GEMS/Water GFQA (not the EPA Water Quality Portal) on 2026-08-16.
Collected and reported by
- Comisión Nacional del Agua
comisionnacionaldelagua13 samples · —
Analytical methods
- GEMStat OPEN / CC BY 4.0
Monitoring station identifiers (1)
MEX03997
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: 2021-09-16
Monitoring stations: 1