Yellow and brown water has been flowing from taps in homes in the Stanley Common and Smalley area for more than three days.
Although Severn Trent said the water was safe to drink, many residents have erred on the side of caution and forked out to buy bottled water.
A burst pipe near Spondon was to blame for the problem, which Severn Trent has been working to fix since Friday.
Writing on Facebook on Monday, Janet Slack, of Stanley Common, told the Advertiser: “It has cost me about £15 in bottled water.
“Severn Trent say it is safe to drink – they can drink it first.”
And Diane Watson in Smalley said: “I’ve not been drinking the water the colour itself is off-putting!
“Even to have a shower,I got out dirtier than when I got in.”
Problems started on Friday lunchtime and engineers started to cleaning pipes in the area to remove sediments over the weekend.
On Sunday night bottled water was delivered to homes in the affected areas.
Severn Trent said it had fixed the pipe this afternoon (Monday) and that it was hoping to resume normal service for customers tomorrow.
Apologising to customers, a spokesman said: “If the problem persists or customers identify anything unusual we would urge them to contact us.”