Where is Diamond Valley Lake?

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

Diamond Valley Lake

Riverside County, California4,918 acresView map Directions

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

Area

4,918 acres

Surface area

Impaired · Mercury
Limited data

See the measurements Directions Where to stay

Diamond Valley Lake in Riverside County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 4918 acres.

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Diamond Valley Lake is a 4,918-acre lake in Riverside County, California.

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

What Diamond Valley Lake is good for

From access and monitoring records, not editorial picks.

Big water4,918 acres

Swimming conditions

No reading

Limited data

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

Whether Diamond Valley 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 Diamond Valley Lake

These are the measurements SWRCB publishes for Diamond Valley 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 Diamond Valley Lake

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

Lake Details

Surface area

4,918 acres

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

Stays via Stay22

Stays near Diamond Valley Lake

Compare lakeside cabins, hotels, and vacation rentals near Diamond Valley Lake in Riverside 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 Diamond Valley Lake

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Fishing Diamond Valley Lake

→ Diamond Valley Lake fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Diamond Valley 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 CAL9023600020190708042418 · Official waterbody report

Nearby Lakes in Riverside County

Skinner Reservoir6.5 miView →Ski Land Lake11.3 miView →Vail Lake13.6 miView →Perris Reservoir14.9 miView →Lake Riverside17.4 miView →Lake Hemet19.4 miView →

Frequently asked questions about Diamond Valley Lake

Where is Diamond Valley Lake?: Diamond Valley Lake is a lake in Riverside County, California. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Diamond Valley Lake?: Diamond Valley Lake in Riverside County, California has water-quality measurements published by SWRCB, shown here as reported. Surface area: 4918 acres.
Is Diamond Valley Lake safe to swim in?: Nutrient and algae readings are not a swimming clearance. Diamond Valley Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.