Lake Ocquittunk
Sussex County, New JerseyView mapDirections
NJDEP publishes the water-quality measurements for Lake Ocquittunk. Here is what has been measured.
- Eutrophic
- Impaired · Mercury
- Limited data
Lake Ocquittunk in Sussex County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 4.1 ft visibility. Phosphorus: 23.2 µg/L. Chlorophyll-a (algae): 13 µg/L.
Lake Ocquittunk is a productive, nutrient-rich eutrophic lake in Sussex County, New Jersey. Compared to the 17 other monitored lakes in Sussex County, Lake Ocquittunk ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-10-26. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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. Lake Ocquittunk is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), temperature. Check local advisories before you swim.
Whether Lake Ocquittunk 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 Lake Ocquittunk
These are the measurements NJDEP publishes for Lake Ocquittunk, 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 4.1 ft. Phosphorus 23.2 µg/L. Chlorophyll-a 13 µg/L. TSI 54.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 23.2µg/L | Fair GoodFairPoor |
| Chlorophyll-a (algae) | 13µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 54 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
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Answers come straight from the public measurements and survey records on this page.
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EPA Impairment Status
Lake Ocquittunk 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: Drinking water, Aquatic life, Fish consumption.
Source: EPA ATTAINS assessment unit NJ02040104140030-01 · Official waterbody report
Nearby Lakes in Sussex County
Frequently asked questions about Lake Ocquittunk
Where is Lake Ocquittunk?
- Lake Ocquittunk is a lake in Sussex County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.
What is the water quality of Lake Ocquittunk?
- Lake Ocquittunk in Sussex County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Water clarity: 4.1 ft visibility. Phosphorus: 23.2 µg/L. Chlorophyll-a (algae): 13 µg/L.
Is Lake Ocquittunk safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Ocquittunk is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), temperature. Check local advisories before you swim.
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Where this data comes from
45 measurements from 3 monitoring stations, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- NJDEP Bureau of Freshwater and Biological Monitoring
NJDEP_BFBM45 samples · 2022
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