One of the Manitoba advantages we take for granted in the dog days of August is our natural abundance of lakes and rivers, places to take the family for a cool dip to beat the heat. But new fears for that resource surfaced this summer, as “No Swimming” signs flew up at some beaches. Toxic algae blooms were the culprit. Do we have a problem, and how do we solve it?
An accident precipitated the health advisory at Big Whiteshell Lake. A sewage lift station on the lake’s south shore had a mechanical failure and raw sewage spilled out near the public beach. Like most point-source pollution – the type where the cause of a decline in water quality can be definitively nailed – this is relatively easy to repair and at worst represents a temporary inconvenience.
But the recurring algae problems in our larger lakes are not so amenable to quick fixes. Despite steady and general improvements in our water quality, the result of common-sense regulation of discharges from “big” polluters, the nutrients that feed these blooms are not point-specific. Nitrogen and phosphorus, the main ingredients in fertilizers, inexorably flow from rain water running off hundreds of farms.
Hot weather supercharges the growth of Microcystis, the dreaded blue-green algae that produce deadly toxins. Even boiling the water doesn’t make it safe to drink. This phenomenon precipitated the warnings at Lake Winnipeg’s beaches, and is a chronic problem in Lake Manitoba, with the Portage Diversion boosting the input of chemicals from natural run-off. Because both lakes are shallow, rainfall and temperature levels are crucial elements in creating conditions unhealthy for animals.
A few crazies in the green movement aside, nobody proposes that we forbid farm chemicals. They are key factors in the productivity of our crop and livestock industries and recent technologies permit their sparest use.
But innovative public policy in other jurisdictions is devising mechanisms to reduce non-point-source pollution. Based on trading schemes that have been so successful in the reduction of air pollutants like sulphur dioxide, incentive systems that encourage cleaner water are working quite well. Michael DeAlessi of the Reason Public Policy Institute recently summarized the results.
The concept is fairly simple. Scientists determine the Total Maximum Daily Load of each target pollutant that a waterway can handle. Within these limits, point-source polluters like municipalities and forestry companies, who may face expensive upgrades to meet dumping targets, pay non-point-source polluters like farmers to employ Best Management Practices to reduce their contributions to the mix.
To quote DeAlessi, “In agriculture examples include the installation of buffer strips along stream beds, adequate fencing to keep livestock from directly soiling surface water, the placement of sheds over manure piles to minimize runoff, and the use of pest control techniques that are low in chemical intensity.” Applicable to any pollutant, the creation of a market mechanism with incentives to reduce environmental impacts is improving the health of watersheds wherever it’s been tried.
DeAlessi reviews the application of watershed trading to the Fox and Wolf River basins in Wisconsin, the source of Green Bay’s chronically poor water quality:
Market systems work well to reduce pollution loads of all kinds because they draw all stakeholders into the effort. They smooth out the point of no return, where the benefits of additional controls are not worth the cost. And they do it voluntarily.
Manitoba Conservation should consider the use of trading to minimize the release of pollutants into our lakes and rivers. It would mean less work for their colleagues at Manitoba Health, who could put away the “No Swimming” signs at our beaches.