Where is Lake Ilsanjo?

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

Lake Ilsanjo

Sonoma County, California32 acresView map Directions

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

Area

32 acres

Surface area

Shoreline

1.4 mi

Measured length

See the measurements Directions Where to stay

Lake Ilsanjo in Sonoma County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 32 acres.

Loading map…

Lake Ilsanjo is a 32-acre lake in Sonoma County, California.

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

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Lake Ilsanjo 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.

Get alerts for Lake Ilsanjo →

Water quality measurements for Lake Ilsanjo

These are the measurements SWRCB publishes for Lake Ilsanjo, 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 Ilsanjo

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

Lake Details

Surface area

32 acres

Shoreline

1.4 mi

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

Stays via Stay22

Stays near Lake Ilsanjo

Compare lakeside cabins, hotels, and vacation rentals near Lake Ilsanjo in Sonoma 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 Ilsanjo

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

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Follow Lake Ilsanjo’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Lake Ilsanjo

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

Nearby Lakes in Sonoma County

Santa Rosa Creek Reservoir2.1 miView →Laguna Lake16.2 miView →Lytton Lake20.3 miView →Merlo Lake—View →Lake Sonoma—View →

Frequently asked questions about Lake Ilsanjo

Where is Lake Ilsanjo?: Lake Ilsanjo is a lake in Sonoma County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Lake Ilsanjo?: Lake Ilsanjo in Sonoma County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 32 acres.
Is Lake Ilsanjo safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.