Holland Tract Middle Pond
Contra Costa County, CaliforniaView mapDirections
No nutrient or algae sampling on record from SWRCB for this lake.
- Limited data
Holland Tract Middle Pond in Contra Costa County, California has water-quality measurements published by SWRCB, shown here as reported.
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. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Holland Tract Middle Pond 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.
Water quality measurements for Holland Tract Middle Pond
These are the measurements SWRCB publishes for Holland Tract Middle Pond, 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 Holland Tract Middle Pond
Answers come straight from the public measurements and survey records on this page.
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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. Its water-quality measurements are published by SWRCB and shown on this page as reported.
What is the water quality of Holland Tract Middle Pond?
- Holland Tract Middle Pond in Contra Costa County, California has water-quality measurements published by SWRCB, shown here as reported.
Is Holland Tract Middle Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.