They didn't know the LA River was full of E. coli, but public officials did.
The Los Angeles River is at a pivotal moment in its history. For most of the past century, it was exclusively a concrete-lined flood control channel. But since 2010 — when federal officials opened two short sections to boating — it's increasingly become a popular recreation spot.
https://www.scpr.org/news/2017/09/20/75770/la-river-who-s-minding-health-risks-to-boaters/
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