Surprise Lake
Surprise Lake in Passaic County, New Jersey is not rated for water quality — its monitoring record does not meet the evidence bar.
Why Surprise Lake 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 Surprise Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
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.
Surprise Lake is a lake in Passaic County, New Jersey.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-10-07. Grade methodology: LakeGrade methodology.
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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 Surprise Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Where to stay near Surprise Lake
Compare lakeside cabins, hotels, and vacation rentals near Surprise Lake in Passaic 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.
Top-rated places to stay near Surprise Lake
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Fishing Surprise Lake
Graded lakes near Surprise Lake
Surprise Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Passaic County
Frequently asked questions about Surprise Lake
Where is Surprise Lake?
- Surprise Lake is a lake in Passaic County, New Jersey. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Surprise Lake?
- Surprise Lake in Passaic County, New Jersey is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Surprise Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Surprise Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Surprise Lake across LakeGrade
More New Jersey Lake Rankings
Other Lakes in New Jersey
Where this data comes from
4 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- NJDEP Bureau of Freshwater and Biological Monitoring
NJDEP_BFBM4 samples · 2024
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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.