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

Lake Piru

Ventura County, California1,066 acresView map Directions

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

Area

1,066 acres

Surface area

Shoreline

18 mi

Measured length

Impaired · Mercury

See the measurements Directions Where to stay

Lake Piru in Ventura County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 1066 acres.

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Lake Piru is a 1,066-acre lake in Ventura County, California.

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

What Lake Piru is good for

From access and monitoring records, not editorial picks.

Big water1,066 acres

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Lake Piru is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, temperature. Check local advisories before you swim.

Whether Lake Piru 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 Lake Piru

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

No clarity data. TSI undefined.

Ask about Lake Piru

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

Lake Details

Surface area

1,066 acres

Shoreline

18 mi

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

Stays via Stay22

Stays near Lake Piru

Compare lakeside cabins, hotels, and vacation rentals near Lake Piru in Ventura 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 Lake Piru

Prices for Oct 16–18, 4 adults. Change dates on the map below.

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Follow Lake Piru’s readings

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Fishing Lake Piru

→ Lake Piru fishing regulations (limits, seasons, special rules)

EPA Impairment Status

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

Causes of impairment

MercuryTemperature

Designated uses not supporting: Aquatic life, Fish consumption, Other.

Source: EPA ATTAINS assessment unit CAL4034100020091208112044 · Official waterbody report

Nearby Lakes in Ventura County

Wood Ranch Reservoir17.9 miView →Lake Sherwood—View →Matilija Lake—View →Lake Casitas—View →

Frequently asked questions about Lake Piru

Where is Lake Piru?: Lake Piru is a lake in Ventura County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Lake Piru?: Lake Piru in Ventura County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 1066 acres.
Is Lake Piru safe to swim in?: Nutrient and algae readings are not a swimming clearance. Lake Piru is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, temperature. Check local advisories before you swim.