Somerset racked up 24 points after being found guilty of preparing "bad" ground for last year's district champion decider against Essex.
Hearing the Lord found the wick ready for the September game had "excessive bounce unevenness".
The deduction of points will take effect in the 2020 champions season, but 12 points are suspended for two years.
Somerset has 14 days to appeal the England and Wales board's decision to the Cricket board.
Statement on the club website said: "Somerset is awaiting a full report from the Disciplinary Cricket Commission before considering our next course of action."
Somerset drew its rain-affected swords in the One against Essex Division, a result that gave the visitors the title of champion.
Following the investigation, Somerset was charged with failing to comply with the regulation which required: "Every county will actively try to prepare the best quality cricket pitch it can for the competition it is organizing."
Somerset accepted the pitch's assessment of "bad" was correct, but pleaded not guilty to the second element of the charge that Taunton's surface "is not the best quality that Somerset has managed to prepare for the match".