Grey County, Ontario · Water Quality Report Card
Williams Lake
Williams Lake in Grey, Ontario received a water quality grade of B (Good). Water clarity: 1.7 m visibility. Phosphorus: 4.9 µg/L.
- Clarity
- 1.7 m
- Type
- Oligotrophic
Williams Lake is a cold, clear oligotrophic lake in Grey County, Ontario. Water quality is graded B based on 2 sampling years through 2009. Compared to the 11 other monitored lakes in Grey County, Williams Lake ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, Ontario MECP, last sampled 2009-10-19. Grade methodology: LakeGrade methodology.
Watch Williams Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 5.6 ft. Phosphorus level: 4.9 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.7 m | D |
| Phosphorus | 4.9 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Williams Lake
Compare lakeside cabins, hotels, and vacation rentals near Williams Lake in Grey, Ontario — 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 Williams 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 trip to Williams Lake?
Get lake water-quality report cards plus the best cabin & lodging deals near Williams Lake — straight to your inbox. No spam, unsubscribe anytime.
Fishing Williams Lake
Location
County Ranking
Ranked #12 of 12 lakes in Grey
Cleaner Lakes Within 30 Miles
Williams Lake holds Grade B. 5 nearby lakes hold higher grades.
- AMccullough LakeGrey · 5.2 mi · Higher grade (B → A)
- ANorth Louise LakeGrey · 10.5 mi · Higher grade (B → A)
- APearl LakeBruce · 17.7 mi · Higher grade (B → A)
- AWilder LakeGrey · 18.8 mi · Higher grade (B → A)
- BBoyd LakeGrey · 11.6 mi · Higher overall water quality score
Nearby Lakes in Grey
Explore Williams Lake across LakeGrade
More Ontario Lake Rankings
Other Grade B Lakes in Ontario
Oligotrophic Lakes in Ontario
More records, surveys & data sources
Where this data comes from
Measurements for Williams Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2009-10-19
Monitoring stations: