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Water Quality
Algae and Filter Clogging
Seattle’s Cedar River water supply is extremely well protected from contamination. The water quality is so high that it does not require filtration, though the water is disinfected for safety. At some times of year, algae will grow in our lower supply reservoir. These algae are generally unnoticeable and there is no health concern with the algae. However, if you filter your water, during an algal bloom you may notice the filter clogging faster than usual. Algae can also create tastes and odors, but these have been well controlled since new treatment facilities began operating in 2004.
Algal blooms have been occurring in the Cedar water supply since it was brought into service in the beginning of the 20th century. Typically, the blooms occur in the late spring, but due to a number of environmental factors, such as sunlight and temperature, blooms can occur at unexpected times of year. For similar reasons, some blooms are more intense than others. In any case, algal blooms in the Cedar supply are not associated with any health risk.
If you do find that your water filter has clogged sooner than expected, it may be due to algae. You may notice that your filter appears to be covered with clay or plaster. To help alleviate the filter clogging problem, an inexpensive pre-filter can be installed. The pre-filter can be removed, cleaned with a brush or just replaced with a new one. This technique will protect the more expensive cartridge filters and prolong their life.
If you have questions about algae or filter clogging, please contact SPU by emailing drinkingwater.quality@seattle.gov or leaving a phone message at 206-615-0827. .
Related links
Choosing a Home Water Filter
Water Quality at Seattle Public Utilities
Glossary of Drinking Water Terms
Links on other sites
Water On Tap: What You Need To Know – EPA
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