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        MARY CALLAHAN      
          THE PRESS DEMOCRAT | July 26, 2017, 12:41PM        
        | Updated 2 hours ago.      
        More Information      
        Sonoma County provides more information on blue-green algae        at its website         here      
        To read more about the recent findings go         here      
        State guide to identifying blue-green algae,         here      
      Sonoma County officials posted caution signs at beaches up      and down the Russian River on Wednesday alerting visitors to      positive test results for a potentially dangerous, naturally      occurring neurotoxin linked to harmful algae, a problem      surfacing around Northern California this summer.    
      Water samples collected at three local beaches turned up very      low levels of a substance called Anatoxin-a, which is      produced by certain species of blue-green algae, Sonoma      County health officials said.    
      Its the third year in a row the algae-related toxin has been      detected in the river.    
      The most-recent samples were taken Monday and the test      results received Wednesday, Sonoma County Health Officer      Karen Milman said.    
      Though the level of toxin in the water was just at the      ability to detect it, the finding triggers precautionary      alerts under state guidelines, she said.    
      Rivergoers should be particularly watchful of dogs, which are      actually attracted to harmful algae, according to studies,      and, by virtue of their relative body size and habits when      around fresh water, are particularly susceptible to exposure.    
      But swimmers, waders, tubers, paddle boarders and others who      may have direct contact with water, as well as parents of      small children, should take precautions to ensure they do not      put themselves or their offspring at risk, health officials      said.    
      That means avoiding ingesting river water or cooking with it,      washing off after swimming and avoiding hand-to-mouth      contact.    
      Be aware and take precautions to protect themselves,      particularly their pets, but also know that the river is      open, Milman said.    
      The news, if not entirely surprising, is disappointing for      business owners dependent on the river, coming at high season      for tourism.    
      After three consecutive years, and with the toxin levels so      low, many said they thought most visitors would continue to      enjoy local beaches and boating, though some unknown number      will stay away, they said.    
      I think the newness of these warnings has warn off, so      people realize that the risk is low, said Dan Poirier,      co-owner of Johnsons Beach & Resort in Guerneville.    
      John Menth, a county parks lifeguard who also runs his own      paddle boarding rental and tour company, said he was at      Healdsburgs Veterans Memorial Beach on Wednesday when county      personnel came to post the caution signs.    
      Some arriving visitors turned right around and left, he      said, forecasting some impact on river business.    
      But he and others said they hoped people would understand      they are not at risk if they dont go down there and drink      the water.    
      The Russian River notification comes in the wake of a broader      alert from the North Coast water quality regulators about the      potential for harmful algal blooms in fresh water bodies      around the region  including Lake, Mendocino and Humboldt      counties  as a result of summer conditions that include      warming water temperatures and slow-moving water.    
      Algae-related toxins already have been reported at several      sites around Northern California this year, including in      Clear Lake and in Upper and Lower Blue Lakes, all in Lake      County.    
      Blue-green algae is reportedly widespread in Clear Lake,      though samples that tested positive for toxins in early July      were at very low levels, mostly from the most southerly parts      of the lake, according to Sue McConnell, a program manager      with the Central Valley Regional Water Quality Control Board,      with jurisdiction over most of Lake County.    
        More Information      
        Sonoma County provides more information on blue-green algae        at its website         here      
        To read more about the recent findings go         here      
        State guide to identifying blue-green algae,         here      
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      A dense bloom in the lakes upper arm also is believed to      have contributed to a fish kill that left hundreds, perhaps      thousands of fish dead this week near Clearlake Oaks,      apparently after they suffocated in water that had been      depleted of oxygen, Lake County Water Resources Director Phil      Moy said.    
      In that case, the fish are not believed to have died as a      result of toxin, but because the blue-green algae, formally      known as cyanobacteria, use oxygen at night and give off      carbon dioxide, creating low oxygen levels, he said.    
      Toxic concentrations of two harmful algae also were detected      in a Napa River pond where two dogs died last month, while a      toxic bloom was reported last week in Lake Countys Copsey      Creek.    
      The South Fork of the Eel River, which crosses into northern      Mendocino County from Humboldt County, also is historically a      common hot spot for toxic algae blooms.    
      Sonoma County health officials and state quality water      regulators have been monitoring conditions in the Russian      River closely since an outbreak of harmful algae the summer      of 2015 led to the deaths of two dogs.    
      In both cases, Anatoxin-a appeared to be responsible, causing      violent, sudden illness and death within moments of exposure.    
      Caution signs were posted again last year on the Russian      River after routine testing revealed low levels of the      substance. This year, seasonal testing began July 17 after      river monitoring suggested the kinds of conditions in which      blue-green algae, or cyanobacteria, thrive, Milman said.    
      All 10 beaches that are part of the testing protocol were      clear last week.    
      Test results received Wednesday showed that samples from      Cloverdale River Park Beach, Del Rio Woods Beach in      Healdsburg and Patterson Point beach, downstream of Monte Rio      in the community of Villa Grande, all had barely detectable      levels of Anatoxin-a, measured between 0.14 and 0.16      micrograms per liter.    
      Under state guidelines, any detection of neurotoxin triggers      cautionary notification about a water body.    
      Danger warnings that prohibit swimming and other activities      in the water are not required until the toxin level reaches      20micrograms per liter, or about 130times what      was detected early this week.    
      The bilingual caution signs posted Wednesday say that harmful      algae may be present in the water and urge the public to      avoid algae and scum while swimming, to keep children away      from the shoreline, to prevent animals from drinking the      water or eating scum, to avoid drinking or cooking with the      water, to throw away the guts and clean fillet of any fish      caught in the river and to avoid eating shellfish caught in      the river. Larry Laba, owner of Healdsburg-based SOAR      Inflatables and Russian River Adventures, lost his own dog      during the 2015 bloom and said he was contacting customers      who had reserved space for dogs on their boating tours to      inform them of recent developments and offer refunds.    
      He noted that the toxin level in the river when his dog died      was several hundreds times what it is right now.    
      Im not encouraging them to come (with dogs), he said. Im      encouraging them to make a smart choice, is the best way I      can put it.    
      Water quality experts say harmful algal blooms have become      more common and persistent in recent years, possibly related      to changing conditions linked to global warming.    
      Blue-green algae tends to thrive in warm, slow-moving,      shallow water, which is why it tends to peak in the latter      part of summer and was prominent during Californias recent      drought.    
      Officials also are wary of the impact this year of voluminous      runoff that likely loaded streams and lakes with phosphates      and other nutrients on which blue-green algae could feed.    
      Heightened awareness, closer monitoring and more refined      testing may be alerting the public to blooms they wouldnt      have known about even a decade ago, officials said.    
      Thats a big part of the dynamic, said Don McEnhill,      executive director of the Russian Riverkeeper. We never      looked before, and there could have been these very low      concentrations that we werent aware of before.    
      You can reach Staff Writer Mary Callahan at 707-521-5249 or      mary.callahan@pressdemocrat.com. On Twitter @MaryCallahanB.    
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Sonoma County issues toxic algae warning for Russian River ... - Santa Rosa Press Democrat