California's national forests are supposed to be places of beauty where people can go to get back in touch with nature.

But there's a man-made threat lurking in the forests and valleys: thousands of illegal pot farms pepper the state's forests. Many of those growers bring in tons of fertilizer and pesticide to boost their plant's growth.

Now, Reuters reports that the widespread use of these chemicals could put the state's water supply at risk.

Sharon Bernstein is the Reuters Sacramento Correspondent. She joined Take Two's A Martinez for more. 

Press the blue play button above to hear the full interview.