Holland Tract North Pond
Holland Tract North Pond in Contra Costa County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 103.5 µg/L.
- Public access
- Yes
Why Holland Tract North 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 North Pond, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded algae (chlorophyll-a), but not water clarity and phosphorus.
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 North Pond is a lake in Contra Costa County, California. Limited fish-species data available. Public access is available with 3 public boat landings.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-07-25. Grade methodology: LakeGrade methodology.
Watch Holland Tract North Pond water quality
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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 North Pond
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Chlorophyll-a: 103.5 µg/L. Trophic State Index: 76.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 103.5 µg/L | Not graded |
| Trophic State Index (TSI) | 76 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Holland Tract North Pond
Compare lakeside cabins, hotels, and vacation rentals near Holland Tract North 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 North Pond
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Recreation & Access
- Russo's MarinaPublic
- Piper Point MarinaPublic
- Beacon HarborPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Holland Tract North Pond
EPA Impairment Status
Holland Tract North Pond is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit CAL5440000020200616047826 · Official waterbody report · Matched by proximity (2.61 km)
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. 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 North Pond?
- Holland Tract North Pond in Contra Costa County, California is not rated for water quality — its monitoring record does not meet the evidence bar. Chlorophyll-a (algae): 103.5 µg/L.
Is Holland Tract North Pond safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Holland Tract North Pond is not rated for water quality — its monitoring record does not meet the evidence bar. Algae concentration (chlorophyll-a) is 103.5 µg/L. Always check local health department advisories before swimming.
Are there boat ramps on Holland Tract North Pond?
- Holland Tract North Pond has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Russo's Marina, Piper Point Marina, Beacon Harbor. Public access is listed as yes.
Explore Holland Tract North Pond across LakeGrade
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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)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory