Where is Calero Reservoir?

Calero Reservoir is a lake in Santa Clara County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.

Calero Reservoir

Santa Clara County, California191 acresView map Directions

No nutrient or algae sampling on record from SWRCB for this lake.

Area

191 acres

Surface area

Impaired · Mercury
Limited data

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Calero Reservoir in Santa Clara County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 191 acres.

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Calero Reservoir is a 191-acre lake in Santa Clara County, California.

Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Calero Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.

Whether Calero Reservoir is safe to swim in today is a call for the California State Water Resources Control Board and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

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Water quality measurements for Calero Reservoir

These are the measurements SWRCB publishes for Calero Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data.

Ask about Calero Reservoir

Answers come straight from the public measurements and survey records on this page.

Lake Details

Surface area

191 acres

No bathymetric survey has been published for Calero Reservoir, so its depth is not documented here.

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Stays near Calero Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Calero Reservoir in Santa Clara County, California — 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.

Top-rated places to stay near Calero Reservoir

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Fishing Calero Reservoir

→ Calero Reservoir fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Calero Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit CAL2054003119980928111759 · Official waterbody report

Nearby Lakes in Santa Clara County

Almaden Reservoir3.2 miView →Guadalupe Reservoir4.8 miView →Chesbro Reservoir6.2 miView →Uvas Reservoir8.5 miView →Lake Elsman8.3 miView →Anderson Lake9.2 miView →

Frequently asked questions about Calero Reservoir

Where is Calero Reservoir?: Calero Reservoir is a lake in Santa Clara County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Calero Reservoir?: Calero Reservoir in Santa Clara County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 191 acres.
Is Calero Reservoir safe to swim in?: Nutrient and algae readings are not a swimming clearance. Calero Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.