Why dirty water is still a problem for rivers, brooks in Greater Boston 04:03. Boston Harbor has come a long way since it was labeled an "open sewer" in the 1980s.

MEDFORD — Urban rivers in Greater Boston remain polluted and cleanup efforts hardly made a dent in water quality last year, an annual report card by environmental regulators and river watershed ...

But in parts of Greater Boston, untreated sewage is still entering rivers and streams during heavy rain, and the problem is only expected to get worse as climate change brings more intense storms.