Weequahic Lake
Essex County, New JerseyView mapDirections
NJDEP publishes the water-quality measurements for Weequahic Lake. Here is what has been measured.
- Hypereutrophic
- Impaired · Dioxins
Weequahic Lake in Essex County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 3.9 ft visibility. Phosphorus: 60 µg/L. Chlorophyll-a (algae): 52.3 µg/L.
Weequahic Lake is a highly nutrient-loaded hypereutrophic lake in Essex County, New Jersey. Compared to the 1 other monitored lakes in Essex County, Weequahic Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-10-15. Methodology: how these readings are compared.
Swimming conditions
Readings onlyAlgae risk
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Weequahic Lake is listed impaired under Clean Water Act §303(d) (IR 5) for dioxins, mercury, nutrients (phosphorus, nitrogen), pesticides, pCBs, toxic organics. Check local advisories before you swim.
Whether Weequahic Lake is safe to swim in today is a call for the New Jersey Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Weequahic Lake
These are the measurements NJDEP publishes for Weequahic Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 3.9 ft. Phosphorus 60 µg/L. Chlorophyll-a 52.3 µg/L. TSI 63.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 60µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 52.3µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 63 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Weequahic Lake
Answers come straight from the public measurements and survey records on this page.
Stays via Stay22
Stays near Weequahic Lake
Compare lakeside cabins, hotels, and vacation rentals near Weequahic Lake in Essex County, New Jersey — 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Weequahic Lake are listed below.
Top-rated places to stay near Weequahic Lake
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Weequahic Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Weequahic Lake
EPA Impairment Status
Weequahic Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption.
Source: EPA ATTAINS assessment unit NJ02030104010010-01 · Official waterbody report
Nearby Lakes in Essex County
Frequently asked questions about Weequahic Lake
Where is Weequahic Lake?
- Weequahic Lake is a lake in Essex County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.
What is the water quality of Weequahic Lake?
- Weequahic Lake in Essex County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 3.9 ft visibility. Phosphorus: 60 µg/L. Chlorophyll-a (algae): 52.3 µg/L.
Is Weequahic Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Weequahic Lake is listed impaired under Clean Water Act §303(d) (IR 5) for dioxins, mercury, nutrients (phosphorus, nitrogen), pesticides, pCBs, toxic organics. Check local advisories before you swim.
Explore Weequahic Lake across LakeQuality
More lakes in New Jersey
Other Lakes in New Jersey
Hypereutrophic Lakes in New Jersey
Where this data comes from
88 measurements from 3 monitoring stations, 2023–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- NJDEP Bureau of Freshwater and Biological Monitoring
NJDEP_BFBM88 samples · 2023–2024
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (3)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database