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Results from 20 years of stream testing show voluntary program has succeeded in some areas, struggles in others

After corresponding with several state agencies, regional EPA administrator leaves door open to federal intervention

World-class fisheries on the lower Deschutes River are struggling as water quality declines. Fishing guide Amy Hazel won’t go down without a fight.

More than 30 years after being recognized as a problem, nitrate contamination is still making well water unsafe to drink in Morrow and Umatilla counties.

California’s proposed limit for hexavalent chromium — the first in the nation — would raise water rates in many cities. The contaminant, linked to cancer, was made infamous by Erin Brockovich.

Oregon health and environmental regulators are monitoring water systems for these ubiquitous "forever chemicals," which don't break down in the environment and can remain toxic for decades or centuries.

Investigators believe a 1,200-foot cargo ship dragging anchor in rough seas caught an underwater oil pipeline and pulled it across the seafloor, months before a leak from the line.

California Attorney General Rob Bonta says investigators will work to find the cause of the oil spill and whether anything could have been done to prevent the spill.

Experts say the long-term impacts to the environment — particularly on birds and marine life — could be significant. Officials haven't said what caused the oil to leak from an offshore pipeline.

Federal, state and local agencies are racing to determine the cause of the spill, which is at least 13 square miles in size.

Where fires decimated forest systems that held soil in place, an increase in droughts followed by heavy rainfall poses a different kind of threat to the water supplies that are essential to the health of communities.

As we move into August, some people are tempted to bring pool floaties and other plastic pool toys to lakes and rivers. Researchers at UC Davis are urging people to leave those floaties at home. If the toys rip or break, their glitter and microbeads are like a microplastic bomb that's impossible to clean up.