Backed up sewage and at least one broken oil pipeline are causing some unforeseen concerns for residents in areas affected by the Colorado flooding.
A malfunctioning sewer system has prompted a "no-flush" order in Evans.
A boil water advisory has been issued for the towns of Frederick, Lyons, Firestone and the Left Hand Water District which serves Niwot and the unincorporated areas from the Foothills Highway and I-25 between Longmont and Boulder/Erie.
A break in one of Boulder's sewer lines is funneling raw sewage into Boulder Creek and citizens have also been reporting floodwaters and possibly sewage backing up into their homes.
And as of Monday there was one oil pipeline leaking in Weld County.
"What we're seeing most is it's floodwaters overwhelming the sanitary sewer system," Boulder Public Works spokesman Mike Banuelos told The Denver Post.
Boulder residents are also being asked to minimize their water use, and Evans planned on delivering porta-potties to the city.
The Colorado Oil and Gas Conservation Commission is asking the community to report of oil and gas issues related to the flooding and, according to The Denver Business Journal, the oil and gas industry is shutting down 1,000 wells north of Denver.
“We have operations ranging from unaffected, to in standing water, to locations in rushing water,” Tisha Schuller, the president of the Colorado Oil & Gas Association (COGA), told state regulators Monday morning, adding that to the best of her knowledge, "all the wells affected by the flooding had been shut in."