Holland Tract North Pond
Contra Costa County, CaliforniaView mapDirections
SWRCB publishes the water-quality measurements for Holland Tract North Pond. Here is what has been measured.
- Public access
- Limited data
Holland Tract North Pond in Contra Costa County, California has water-quality measurements published by SWRCB, shown here as reported. Chlorophyll-a (algae): 103.5 µg/L.
Holland Tract North Pond is a lake in Contra Costa County, California. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-07-25. 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 North 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 North Pond
These are the measurements SWRCB publishes for Holland Tract North 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. Chlorophyll-a 103.5 µg/L. TSI 76.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | 104µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 76 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
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Fishing Holland Tract North Pond
Nearby Lakes in Contra Costa County
Frequently asked questions about Holland Tract North Pond
Where is Holland Tract North Pond?
- Holland Tract North 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 North Pond?
- Holland Tract North Pond in Contra Costa County, California has water-quality measurements published by SWRCB, shown here as reported. Chlorophyll-a (algae): 103.5 µg/L.
Is Holland Tract North Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Holland Tract North Pond?
- Public access to Holland Tract North Pond is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by California's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
8 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-CA8 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.