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That’s because southern central maryland has been a bullseye for rain that last month. That’s the result of raw sewage being diverted into your creeks when it rains heavy. Particularly at night, when no one is looking

 

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Your better contacting a local environmental group. Jane retired

 

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Contact a local university and find someone that’s in the field and willing to look into for you. Making a case as an undergrad, gets you places.

 

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You need someone there now! Stuff like that clears quick. I’ll bet there’s a truck dumping Algaecide right now because of this thread

 

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it’s sh-it. There’s nothing you can do about it.

 

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I do suggest you reach out to a local university, someone there would love to investigate it for/with you.