Lake Merced
Lake Merced in San Francisco County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 208 acres.
- Area
- 208 acres
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Why Lake Merced 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 Lake Merced, 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.
Lake Merced is a 208-acre lake in San Francisco County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lake Merced water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Merced
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 Lake Merced
Compare lakeside cabins, hotels, and vacation rentals near Lake Merced in San Francisco 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 Merced
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 208 acres |
No bathymetric survey has been published for Lake Merced, so its depth is not documented here.
Fishing Lake Merced
Nearby Lakes in San Francisco County
Frequently asked questions about Lake Merced
Where is Lake Merced?
- Lake Merced is a lake in San Francisco 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 Lake Merced?
- Lake Merced in San Francisco County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 208 acres.
Is Lake Merced safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Merced is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Lake Merced across LakeQuality
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Where this data comes from
Measurements for Lake Merced come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.