North School Section Lake
North School Section Lake in Washington County, Minnesota has a water quality grade of C (Fair). Water clarity: 7.8 ft visibility. Phosphorus: 25.5 µg/L. Chlorophyll-a (algae): 8 µg/L.
- Clarity
- 7.8 ft
- Typical in August
- 73°F
- Type
- Mesotrophic
- Public access
- No
Next lake in Washington County
North School Section Lake is a mesotrophic lake in Washington County, Minnesota. Water quality is graded C based on 2 sampling years through 2024. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 74 other monitored lakes in Washington County, North School Section Lake ranks #40 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-01. Grade methodology: LakeGrade methodology.
Watch North School Section Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Moderate clarity, visible to about 7.8 ft. Phosphorus level: 25.5 µg/L. Chlorophyll-a: 8 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.8 ft | Not graded |
| Phosphorus | 25.5 µg/L | Fair |
| Chlorophyll-a (Algae) | 8 µg/L | Fair |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near North School Section Lake
Compare lakeside cabins, hotels, and vacation rentals near North School Section Lake in Washington County, Minnesota — 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 North School Section Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
North School Section Lake typically sits around 73°F at the surface in August. Summer average is about 72°F. Usually warmest in Jul (about 74°F) and coldest in Apr (about 49°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 49 field readings (2019–2024) via the EPA Water Quality Portal. See the full North School Section Lake water temperature breakdown →
Fishing North School Section Lake
EPA Impairment Status
North School Section Lake 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 MN82-0151-00 · Official waterbody report · Matched by proximity (0.83 km)
County Ranking
Ranked #40 of 75 lakes in Washington County
Nearby Lakes in Washington County
Frequently asked questions about North School Section Lake
What is the water quality grade for North School Section Lake?
- North School Section Lake in Washington County, Minnesota has a water quality grade of C (Fair). Water clarity: 7.8 ft visibility. Phosphorus: 25.5 µg/L. Chlorophyll-a (algae): 8 µg/L.
Is North School Section Lake safe to swim in?
- Generally safe for swimming, moderate water quality. North School Section Lake has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 8 µg/L. Always check local health department advisories before swimming.
What is the water temperature of North School Section Lake?
- North School Section Lake typically sits around 73°F at the surface in August, from 49 EPA Water Quality Portal field readings (2019–2024). That is a typical value for the month, not a live reading.
Explore North School Section Lake across LakeGrade
Fish species and top-graded lakes across Minnesota
Fish species and best lakes in Washington County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its grade
Lakes in the St. Croix Watershed, ranked by water quality
Moderate nutrients, good water quality
Minnesota's cleanest and most-polluted lakes, ranked
More Minnesota Lake Rankings
State Parks Near North School Section Lake
Other Grade C Lakes in Minnesota
Mesotrophic Lakes in Minnesota
Where this data comes from
28 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA28 samples · 2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- Analysis of Chlorophyll in Periphyton and Plankton
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
Lake size & watershed from HydroLAKES (HydroSHEDS)