Where is Bon Tempe Lake?

Bon Tempe Lake is a lake in Marin County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.

Bon Tempe Lake

Marin County, California121 acresView map Directions

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

Area

121 acres

Surface area

Impaired · Mercury
Limited data

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Bon Tempe Lake in Marin County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 121 acres.

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Bon Tempe Lake is a 121-acre lake in Marin 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. Bon Tempe Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.

Whether Bon Tempe Lake 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 Bon Tempe Lake

These are the measurements SWRCB publishes for Bon Tempe Lake, 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 Bon Tempe Lake

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

Lake Details

Surface area

121 acres

No bathymetric survey has been published for Bon Tempe Lake, so its depth is not documented here.

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Stays near Bon Tempe Lake

Compare lakeside cabins, hotels, and vacation rentals near Bon Tempe Lake in Marin 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 Bon Tempe Lake

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Fishing Bon Tempe Lake

→ Bon Tempe Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Bon Tempe Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption, Other.

Source: EPA ATTAINS assessment unit CAL2011302020050519182103 · Official waterbody report

Nearby Lakes in Marin County

Alpine Lake1.2 miView →Kent Lake4.4 miView →Rodeo Lagoon W Bottom Lake9.4 miView →Rodeo Lagoon W Top Lake9.4 miView →Rodeo Lagoon E Bottom Lake9.4 miView →Rodeo Lagoon E Top Lake9.4 miView →

Frequently asked questions about Bon Tempe Lake

Where is Bon Tempe Lake?: Bon Tempe Lake is a lake in Marin County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Bon Tempe Lake?: Bon Tempe Lake in Marin County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 121 acres.
Is Bon Tempe Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Bon Tempe Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.