The case was heard by Aberdeen sheriffs on 15 July but sentence was deferred until 12 August. The court heard that a member of the public notified the Scottish Environment Protection Agency of sewage in the Brodiach burn in June last year.
SEPA staff had to prompt Scottish Water staff to take action to stem an overflow from Westhill sewage pumping station after a remote alarm system warning of the overflow went unheeded.
Several thousands of litres of untreated sewage entered the burn, which is a tributary of the river Don, a candidate Special Area of Conservation.
The company pleaded guilty to a charge under section 30F(3) of the Control of Pollution Act 1974.