Williams Lake
San Jose River, British ColumbiaView mapDirections
No A–F letter for this lake. The letter is scored against EPA reference conditions for a lake’s ecoregion, and those stop at the US border. Here is what has been measured.
- Limited data
Williams Lake in San Jose River, British Columbia has water-quality measurements published by ENV and no A–F letter. The letter's EPA reference conditions stop at the US border. Water clarity: 1.2 m visibility. Phosphorus: 56.6 µg/L. Chlorophyll-a (algae): 13.4 µg/L.
- Clarity
- 1.2 m
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Why Williams Lake has no A–F letter
The LakeQuality letter is scored against EPA National Lakes Assessment reference conditions for a lake’s ecoregion, and those stop at the US border. There is no reference condition for British Columbia, so the scale cannot be applied to Williams Lake at any level of sampling. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
This is not a gap in the monitoring record. ENV publishes these measurements directly, and everything below that has been measured is reported on this page as ENV reports it.
Monitoring: the British Columbia Ministry of Environment and Parks. Read the full grading methodology.
Williams Lake is a lake in San Jose River County, British Columbia.
Source: the British Columbia Ministry of Environment and Parks — not the EPA Water Quality Portal, last sampled 2026-08-11. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Williams Lake
These are the measurements ENV publishes for Williams Lake. No A–F letter applies here: see why.
Murky, only visible to about 4 ft. Phosphorus 56.6 µg/L. Chlorophyll-a 13.4 µg/L. TSI 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.22 m | Measured, not scored |
| Phosphorus | 56.6 µg/L | Measured, not scored |
| Chlorophyll-a (Algae) | 13.4 µg/L | Measured, not scored |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Williams Lake
Nearby Lakes in San Jose River
Frequently asked questions about Williams Lake
Where is Williams Lake?
- Williams Lake is a lake in San Jose River, British Columbia. Its water-quality measurements are published by ENV, and it carries no A–F letter, because no reference condition exists for lakes in this region, so the assessment thresholds behind the A–F scale cannot be applied here.
What is the water quality grade for Williams Lake?
- Williams Lake in San Jose River, British Columbia has water-quality measurements published by ENV and no A–F letter. The letter's EPA reference conditions stop at the US border. Water clarity: 1.2 m visibility. Phosphorus: 56.6 µg/L. Chlorophyll-a (algae): 13.4 µg/L.
Is Williams Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Williams Lake across LakeQuality
More lakes in British Columbia
Other Lakes in British Columbia
Eutrophic Lakes in British Columbia
Where this data comes from
57 measurements from 1 monitoring station, 2017–2026. Retrieved from British Columbia EnMoDS (not the EPA Water Quality Portal) on 2026-09-06.
Collected and reported by
- British Columbia Ministry of Environment and Parks
enmods-bc57 samples · 2017–2026
Monitoring station identifiers (1)
0603019
Canadian lakes are published with the measurements their provincial programme reports, and without a LakeQuality A–F letter. The letter is scored against EPA reference conditions for a lake’s ecoregion, and the EPA does not survey these lakes. See how grades are calculated and data sources.