Toilets blocked up or overflowed into bathrooms, potentially placing Corcoran Place residents in a sticky situation.

Fortunately, off-duty Upper Lachlan Shire Council staff broke off their weekend rest, and quickly repaired the damage.

General manager Colleen Worthy said the damage was regrettable, but praised the staff's fast response that stopped sewage from entering the water supply.

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Council's sewerage treatment plant staff were notified of the blocked sewers late on the Saturday afternoon, Ms Worthy said.

The treatment staff discovered that a private firm had drilled through the main sewer line. The water from the damaged sewer lines caused connections and toilets in Corcoran Place to block up and overflow.

Council resolved the immediate problem, then worked with pipeline company Interflow to repair the damaged main sewer line.

Heavy rain on Thursday delayed the completion of repairs.

"Natural disasters and natural causes have provided a lot to deal with this year without any need for man-made problems," Ms Worthy said.

"It was commendable the staff were able to act efficiently and quickly. As a result of the quick action of Council staff, no sewage entered the river, and water that flowed to the sewerage treatment plant was all treated.

"Some mud and silt also entered the STP with the excess flow but it was all handled by the treatment process."

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