The mammoth mass of waste stretches for more than half a mile and weighs 330 tons, according to a statement from Seven Trent Water.
They calculated that the fatberg could be cleared by June.
“Although the true extent of the blockage will not be known until it is removed, it will likely be one of the biggest blockages that North Trent has ever dealt with,” the company said.
“It’s a huge project and it’s not over yet,” added Scott Bergin, operations manager at Severn Trent. “This giant mass is the result of everyone washing and flushing the wrong things down the drain from time to time, and not realizing the impact it has.”
Bergin blamed unaltered products such as wipes, diapers and sanitary products, which are washed in the second most populous city in England.
And he issued some alliterative advice to the people of Birmingham: “Our advice is to always let the leftover cooking fat cool before throwing it in the bin and just stick to rinsing the three P’s (piss, pu and toilet paper) and the trash can. “
Fatbergs (the word is a coat of fat and an iceberg) form over time as items that cannot be broken are washed or washed down the drain instead of being disposed of properly.
A wastewater sensor that monitors rising water levels has alerted the Birmingham Berg company.
Thames Water, which operates the London water system, says it spends £ 1m a month ($ 1.4m) to clear blockages of this kind.