Update: Lincoln Mayor Chris Beutler on Wednesday lifted the mandatory water restrictions imposed Sunday because of flood damage at the city's water facilities at the Platte River.

He also urged residents and businesses to continue to voluntarily conserve water as work continues to repair the water infrastructure.

All residents and businesses are asked to reduce water consumption by 25 percent. Car washes will be allowed to reopen at 8 a.m. Thursday.

Beutler said wells in the north wellfields have begun production and capacity has risen from 32 to 40 million gallons per day.

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Water and sewer problems caused by flooding continued Tuesday in Lincoln; North Bend; parts of Boyd County; Glenwood, Iowa; and elsewhere, forcing residents and businesses to ration water or resort to using portable showers and toilets.

The Nebraska Department of Health and Human Services said Tuesday that six public drinking water systems aren’t in operation, including ones in Boyd County, Peru and Sarpy County Sanitary Improvement District 97.

Nearly 50 wastewater treatment facilities, including ones connected to Omaha, Nebraska City and Columbus, have reported problems, including cases where wastewater isn’t being fully treated before it’s discharged.

In North Bend, between Fremont and Schuyler, the city’s 1,200 residents have been warned not to drink tap water and to avoid flushing toilets, after flooding damaged the city’s wastewater facility. Dozens of port-a-potties have been set up at a park, the mini-mart and at North Bend Central Junior/Senior High School.

“I can flush my toilet and I can take a shower and I have no problems at all with my drainage, but it pushes water into somebody else’s basement,” said North Bend City Clerk Theresa Busse.

Flooding shut down Omaha’s Papillion Creek Wastewater Treatment Plant on Friday, and the plant is still inaccessible due to submerged roads, Omaha Public Works Director Bob Stubbe told the City Council on Tuesday. It could be weeks or months before it’s up and running again, and sewage is currently being discharged into Papillion Creek.

The Metropolitan Utilities District, which provides water to much of the Omaha metro area, continues to assure customers that its daily tests show that drinking water is safe.

About three-fourths of Boyd County, west of Niobrara, is without water after floodwaters and ice jams destroyed the Spencer Dam and damaged a rural water district pipeline.

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Most pressing is that about 500 rural farms and ranches are without water, meaning livestock that have survived have not had water for nearly a week, said Douglas Fox, coordinator of Region 24 Emergency Management, which covers Boyd, Brown, Cherry, Keya Paha and Rock Counties.

On the Santee Indian Reservation, the tribe’s water system was not operational until Monday afternoon. Even then, the water was suitable only for flushing toilets and taking showers.

Mandatory water restrictions continue in Lincoln, Nebraska’s second-largest city, with residents asked to cut their water usage in half and industrial and commercial sites asked to reduce by 25 percent.

Lincoln officials said it’s unclear how much longer the restrictions will last.

“Mandatory water restrictions are being evaluated on a daily basis as crews work diligently to restore power and repair damage at the City of Lincoln wellfields,” said a statement from the Lincoln Department of Transportation and Utilities. “As soon as water production is restored to more adequate levels, the restrictions will be lifted.”

City wells on the Platte River near Ashland have been affected by flooding and power outages related to the historic flooding that hit Nebraska last week. The water quality is fine, Mayor Chris Beutler stressed — the supply is the problem.

Residents are asked to take short showers, flush toilets sparingly and postpone running washing machines and dishwashers. Car washes are shut down and restaurants have been asked to use disposable dishes.

It’s spring break at the University of Nebraska-Lincoln, which has greatly reduced the university’s water use.

Classes are back on Wednesday at Peru State College, after being canceled Monday and Tuesday because of water supply problems, said spokesman Jason Hogue.

Levees broke outside Peru on Saturday night, swamping the city’s water treatment plant. Water is being trucked in from Auburn, and the area is under a boil-water advisory as a precaution since new water is being added from an outside source.

“We expect to be drinking bottled water for a while,” Hogue said. “There’s not a crisis. We’re not thirsty.”

World-Herald staff writers Alia Conley and Aaron Sanderford contributed to this report.