Water Quality
Our First Concern
For at least a generation, cottagers, commercial operators and full-time lake residents have been expressing concern about the water quality in our lakes. Indeed, water quality was the number one issue identified through the Lake Planning process that led to the creation of Environment Council in 2008 – and it remains so today.
Everyone values clean lake water – it is essential to enjoyment of all forms of recreation in, on and around the lakes, and it’s equally important to the health and future of wildlife populations, including fish. Main concerns about surface water quality are bacteria pollution (especially E.coli) and over-nutrification of algae and aquatic weeds, largely due to high levels of phosphorus. Simply put, phosphorus “fertilizes” the algae and aquatic weeds.
Research by the Kawartha Lake Stewards Association (KLSA) has identified the main causes of phosphorus, bacteria and other pollutants in our lakes:
upstream municipal sewage runoff, especially from shorelines and areas that are no longer in their natural state
agricultural and residential runoff (animal waste, fertilizers, herbicides and pesticides)
faulty septic systems and holding tanks.
The Environment Council focuses its efforts to protect water quality on the immediate Clear, Ston(e)y and White Lake watershed by conducting ecosystem monitoring, evaluating and protecting important wetlands that filter pollutants, working to protect and restore natural shorelines to reduce runoff, and promoting good septic system practices to prevent pollution.
Dissolved oxygen sampling is one of the important ways we measure the health of our water.
Lake Partner Water Monitoring Program (continued)
What the Program Does
LPP volunteers collect water samples and conduct clarity measurements to find key indicators of lake health:
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Total Phosphorus: Elevated levels can lead to algal blooms, reduced water clarity, and decreased oxygen levels, adversely affecting aquatic life.
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Calcium: Essential for many aquatic organisms, and declining levels can stress delicate ecosystems.
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Chloride: Road salt runoff is the biggest source of excessive chloride in our lake water, harming freshwater species.
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Water Clarity: Measured using a Secchi disk, clarity readings help detect changes due to factors like invasive species or watershed disturbances.
Sampling is done once a month from May to October.
Why the LPP Matters
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Early Detection: Identifying nutrient increases or clarity declines helps prevent ecological issues like algal blooms.
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Long-Term Data Collection: Spanning over two decades, the sampling data provides valuable insights into environmental trends and the impacts of climate change.
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Community Engagement: Using volunteers across many lake associations promotes stewardship and raises awareness about the importance of freshwater conservation.
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Informed Decision-Making: Lake associations, researchers, and policymakers can make evidence-based decisions about lake management.
Current Challenges
As of May 2025, the LPP faces uncertainty due to the expiration of its agreement with the MECP on March 31, 2025. FOCA has issued a call-to-action urging supporters to advocate for the program’s continuation, highlighting its importance to Ontario’s environmental health.
A number of Environment Council members are LPP volunteers, and our Council has added its voice to the over 500 letters sent to the provincial government in support of the LPP. In addition, we have urged our lake association partners to do the same. We remain hopeful that the government will heed the call to continue funding the LPP.
If you wish to throw your support behind this valuable program, please visit https://foca.on.ca/lake-partner-program/, where you will find a customizable template you can use to send your own message.
Monitoring D.O.
How data are collected and used
Certain amounts of DO are lost when microorganisms in the water use DO in the process of decomposing organic matter such as large algae blooms. This is most apt to occur during the summer season. DO levels fluctuate between spring, summer and early fall seasons, and may also change on a daily basis dependent upon the ecology of the water body.
Generally, DO levels below 3 milligrams per liter (mg/L) are of concern and waters with levels below 1 mg/L are considered to have very little or no oxygen, and are usually devoid of life. (It’s important to remember that each aquatic organism has its own oxygen requirement.)
(Monitoring D.O. continues below)
Monitoring DO requires sampling during each of our three seasons, optimally over a period of years. Water quality data are reported to the Ministry of the Environment, Conservation and Parks. The data provide important trends over time reflecting changes in the lakes’ temperature and capacity to support life. These measurements are particularly important as we now see fluctuating weather and temperature throughout our seasons. Information is used to project hot spots – lakes in need of additional assessment or intervention (Ryerson University is currently conducting research on this topic).
The data are reviewed by biologists with focus on changes in our lakes’ oxygen content which may signal threats to fisheries and other organisms. These observations are very useful in supporting our attempts to curb inappropriate development and promote best management practices and municipal due diligence in preventing increased nutrient run-off to the lake ecosystem.
Data are also used for developing educational materials and for informing the planning process with respect to lake capacity assessment issues.
We have been advised that the Ministry is grateful for volunteer DO sampling as their staff numbers do not allow for researching all of our Ontario lakes.
