Diamond Valley Lake
Diamond Valley Lake in Riverside County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 4918 acres.
- Area
- 4,918 acres
Next lake in Riverside County
Swipe left or right on this bar to open the next or previous lake.
Why Diamond Valley Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Diamond Valley Lake, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Diamond Valley Lake is a 4,918-acre lake in Riverside County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Diamond Valley Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Diamond Valley Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay 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
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 4,918 acres |
No bathymetric survey has been published for Diamond Valley Lake, so its depth is not documented here.
Fishing Diamond Valley Lake
Nearby Lakes in Riverside County
Frequently asked questions about Diamond Valley Lake
Where is Diamond Valley Lake?
- Diamond Valley Lake is a lake in Riverside County, California. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Diamond Valley Lake?
- Diamond Valley Lake in Riverside County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 4918 acres.
Is Diamond Valley Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Diamond Valley Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Diamond Valley Lake across LakeQuality
More California Lake Rankings
Other Lakes in California
Where this data comes from
Measurements for Diamond Valley Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.