Residents of Myrtle Creek are asked to reduce water use immediately due to a supply shortage after a diesel spill in Cow Creek.

Concerns that the contamination might have flowed into the South Umpqua River prompted the public works department to stop using its water treatment plant in the river, said Steve Johnson, Myrtle Creek’s public works director.

Some 4,300 gallons of diesel flowed into the creek after a train derailment west of Riddle Tuesday afternoon.

“There’s not a possibility that we have any of the contamination. We were notified well in advance,” Johnson said.

Riddle residents have been asked to avoid using and drinking tap water until water test samples are back. The Associated Press is also reporting Riddle schools will be closed Friday.

Myrtle Creek is now relying solely on its Springbrook water plant on Springbrook Road, which uses water from several winter springs, until officials determine if fuel levels in Cow Creek and the South Umpqua are toxic. Samples have been sent to Medford for testing.

The following restrictions apply:

• Absolutely no outside water use

• Take very short showers or sponge bath, one to two minutes

• Flush only when absolutely necessary

• No clothes washing

• Wash dishes by hand

The goal is to limit use to no more than 10 to 15 gallons per day. The following table will help people estimate water use.

Shower: 2 to 5 gallons per minute

Dish Washer: 8 to 12 gallons per complete cycle

Clothes washer: 40 to 55 gallons for top loader, 20 to 30 for side loader per complete cycle

Toilet: 4 to 6 gallons for older models, 1.6 gallons for new, efficient types

Running sink: 1 to 5 gallons per minute