Holland Tract Middle Pond
Holland Tract Middle Pond in Contra Costa County, California is not rated for water quality — its monitoring record does not meet the evidence bar.
Why Holland Tract Middle Pond has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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 Holland Tract Middle Pond, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
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.
Holland Tract Middle Pond is a lake in Contra Costa County, California.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-02-24. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Holland Tract Middle Pond
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Where to stay near Holland Tract Middle Pond
Compare lakeside cabins, hotels, and vacation rentals near Holland Tract Middle Pond in Contra Costa 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 Holland Tract Middle Pond
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Fishing Holland Tract Middle Pond
Nearby Lakes in Contra Costa County
Frequently asked questions about Holland Tract Middle Pond
Where is Holland Tract Middle Pond?
- Holland Tract Middle Pond is a lake in Contra Costa County, California. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Holland Tract Middle Pond?
- Holland Tract Middle Pond in Contra Costa County, California is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Holland Tract Middle Pond safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Holland Tract Middle Pond is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Holland Tract Middle Pond across LakeGrade
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Where this data comes from
2 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- USGS California Water Science Center
USGS-CA2 samples · 2022
Analytical methods
- Plant pigments, sonication & 445
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.