Lakes monitored
Prospect Lake
Updated September 23, 2025
| Date |
Lake |
Test Location |
Toxin Type |
Amount |
Report |
| Sep 23, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.1140 ug/L |
W189904 |
| Sep 16, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0190 ug/L |
W189787 |
| Sep 9, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0740 ug/L |
W189640 |
| Sep 2, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0310 ug/L |
W189454 |
| Aug 26, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W189349 |
| Aug 19, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W189204 |
| Aug 12, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W189055 |
| Aug 5, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W188883 |
| Jul 28, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W188729 |
| Jul 22, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W188627 |
| Jul 15, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W188477 |
| Jul 8, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W188342 |
| Jun 30, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W188189 |
| Jun 24, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W188072 |
| Jun 17, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W187941 |
| Jun 10, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W187808 |
| Jun 3, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W187647 |
| May 27, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W187491 |
| May 20, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W187326 |
| May 13, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W187201 |
| May 6, 2025 |
Prospect lake |
Whitehead Park Dock |
Total Microcystin |
0.0000 ug/L |
W187036 |
| Mar 18, 2025 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystin |
0.0000 ug/L |
W186089 |
| Feb 18, 2025 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystin |
0.0000 ug/L |
W185553 |
| Jan 21, 2025 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystin |
0.0000 ug/L |
W185129 |
| Oct 22, 2024 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystin |
0.0120 ug/L |
W183633 |
| Oct 8, 2024 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystins |
0.0130 ug/L |
W183344 |
| Oct 1, 2024 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystins |
0.0027 ug/L |
W183197 |
| Sep 24, 2024 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystins |
0.0000 ug/L |
W183063 |
| Sep 17, 2024 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystins |
0.0000 ug/L |
W182937 |
| Sep 3, 2024 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystins |
0.0000 ug/L |
W182658 |
| Aug 20, 2024 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystins |
0.0020 ug/L |
W182408 |
| Aug 14, 2024 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystins |
0.0000 ug/L |
W182313 |
| Jul 24, 2024 |
Prospect lake |
Boat Launch - Echo Dr. |
Total Microcystin |
0.0010 ug/L |
W181911 |
| Jul 17, 2024 |
Prospect lake |
Whitehead Park Beach |
Total Microcystin |
0.0020 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)