Lakes monitored
Thetis Lake
Updated September 24, 2025
| Date |
Lake |
Test Location |
Toxin Type |
Amount |
Report |
| Sep 24, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W189904 |
| Sep 17, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0010 ug/L |
W189787 |
| Sep 11, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W187808 |
| Sep 10, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0020 ug/L |
W189640 |
| Sep 2, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W189454 |
| Aug 27, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W189349 |
| Aug 20, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0070 ug/L |
W189204 |
| Aug 13, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W189055 |
| Aug 5, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W188883 |
| Jul 29, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W188729 |
| Jul 23, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W188627 |
| Jul 16, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W188477 |
| Jul 9, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W188342 |
| Jul 1, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W188189 |
| Jun 25, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W188072 |
| Jun 18, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W187941 |
| Jun 4, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W187647 |
| May 28, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W187491 |
| May 21, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W187326 |
| May 14, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W187201 |
| May 7, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W187036 |
| Mar 19, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W186089 |
| Feb 19, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W185553 |
| Jan 22, 2025 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W185129 |
| Oct 23, 2024 |
Thetis lake |
Main Beach |
Total Microcystins |
0.0000 ug/L |
W183633 |
| Oct 9, 2024 |
Thetis lake |
Main Beach |
Total Microcystins |
0.0130 ug/L |
W183344 |
| Oct 2, 2024 |
Thetis lake |
Main Beach |
Total Microcystins |
0.0095 ug/L |
W183197 |
| Sep 25, 2024 |
Thetis lake |
Main Beach |
Total Microcystins |
0.0140 ug/L |
W183063 |
| Sep 18, 2024 |
Thetis lake |
Main Beach |
Total Microcystins |
0.0000 ug/L |
W182937 |
| Sep 15, 2024 |
Thetis lake |
Main Beach |
Total Microcystins |
0.0000 ug/L |
W182313 |
| Sep 4, 2024 |
Thetis lake |
Main Beach |
Total Microcystins |
0.0530 ug/L |
W182658 |
| Aug 21, 2024 |
Thetis lake |
Main Beach |
Total Microcystins |
0.0000 ug/L |
W182408 |
| Jul 25, 2024 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W181911 |
| Jul 18, 2024 |
Thetis lake |
Main Beach |
Total Microcystin |
0.0000 ug/L |
W181752 |
As part of MB Laboratories internal environmental initiative, we are sharing microcystin test results from select lakes around Victoria, BC where algal blooms have been reported. This project is not affiliated with any government agency or regulatory body — we are providing this information as a community service.
This project reflects our commitment to environmental testing and transparency and we hope this data helps support informed community decisions.
Human Health Guideline Values
For reference, the following human health guideline values apply:
| Use |
Microcystin |
Cylindrospermopsin |
| Canadian Drinking Water |
1.5 µg/L (Health Canada, 2024) |
Not specified |
| U.S. EPA Drinking Water |
1.6 µg/L (children-adults, 2024) |
3.0 µg/L (EPA, July 2024) |
| U.S. EPA Recreational |
8.0 µg/L (EPA, July 2024) |
15.0 µg/L (EPA, July 2024) |
These limits are for humans. Children and pets are more sensitive and may require extra caution.
Disclaimers
- We are not a regulator. Always consult your local government or health authority for official guidance.
- We are reporting toxin levels only.
- We do not make any claims about water safety for drinking or recreation.
Our testing was performed using:
Method Ref: MBL-S05-LC/MS/MS Algae Toxins rev 5-23Jun23
Based on EPA Method 544 (EPA/600/R-14/474)
(Sevasti-Kiriaki A. et al., J. Haz. Materials 323(A):56-66, 2017; PICES Session 57, Oct 27, 2021)