The mammoth mass of the waste spans more than half a mile and weighs 330 tons, a statement from Seven Trent Water said.
They estimated that the Fatberg might not be cleared until June.
“While the true extent of the blockage will not be known until it is removed, it is likely one of the largest blockages Severn Trent has ever faced,” the company said.
“It’s a huge project and it’s not yet resolved,” added Scott Burgin, Operations Manager at Severn Trent. “This huge mass is the result of everyone occasionally washing the wrong things and putting them down the drains and not realizing the effects they have.”
Burgin accused non-flushable products such as towels, diapers and toiletries of being washed in England’s second largest city.
And he gave an alliterative advice to the residents of Birmingham: “Our advice is to always let the leftover cooking fat cool down before throwing it in the trash and to only flush the three Ps (pee, poo and toilet paper) and the trash can anything else.”
Fatbergs (the word is a portmanteau made from fat and iceberg) form over time when items that cannot be broken down are flushed or flushed down the drain instead of properly disposed of.
A sewage sensor that monitors rising water levels drew the company’s attention to Mount Birmingham.
Thames Water, which operates the water system in London, says it spends £ 1 million ($ 1.4 million) a month to clean up blockages of this type.