If you want a good chance of a clean pint, go to Newcastle.
The city has proved to be the angel of the north when it comes to getting a clean pint, according to a report by beer flow analysts Vianet and quality accreditors Cask Marque.
By monitoring more than 220,000 measuring devices and visiting 22,000 pubs, they discovered that in Newcastle there is a three in four chance of being served through clean lines.
Wigan, Liverpool, Warrington and Wolverhampton also fared well in the Beer Quality Report when it came to line cleaning.
However, if you head to the South West, where the price of a pint is likely to be higher than the North, then you could be in for a disappointment.
Bath topped the list of places you are most likely to get an unclean pint, with Swansea, Bristol, Salisbury and a Scottish outlier, Motherwell, following behind.
One of the reasons the South West fared less well is due to the high sales of cider, which are the lines that are generally cleaned the least often. Vianet found that cider lines were unclean 44 per cent of the time, compared to best in class cask, which was clean 71 per cent of the time.
A line is considered unclean if it has not been cleaned for seven days.
Overall, the report found that the industry is losing £709m a year through sub-standard quality. Big reasons for this include unclean lines (one in three drinks is served through an unclean line), pubs having three or more taps too many, cash in the till not adding up and loss through poor quality pouring.
The report found that the difference between serving beer through clean lines and those that serve through unclean lines is worth around £32,000 a year in profit to a pub.
Steve Alton, Vianet managing director, said: "Draught beer remains in value growth and beer still accounts for about seven in 10 drinks sold in pubs. However, the findings in our report provide a much-needed reality check and demonstrates the category's continued health could be threatened by quality failings."