You might think your local is pretty decent. The carpet doesn't stick to your shoes as you walk through the door, there's no aroma of wet dog, and the jar of salted peanuts on the bar looks (fairly) fresh. Besides, it serves an alright pint and that's all that matters.But have you ever thought about how clean the beer lines that pump your Carlsberg from the keg, through the tap, and into your glass really are? Of course not, which could be why, according to a new report, you're probably drinking dirty pints.Compiled by pub inspectors from Cask Marque and released last week, The Beer Quality Report claims that one in three pints served in British pubs come from beer lines that aren't cleaned regularly, making them breeding grounds for bacteria and mould. Overall, the report says, low quality beer is the result poor cleaning practices in 58.8 percent of British pubs.Cask Marque's report—which aggregates data collection from 220,000 smart devices attached to beer taps, 750 Cask Marque accreditation reviews, and 22,000 visits from researchers—also exposed the areas of the UK in which pubs are most likely to scrimp on the scrubbing. The South West might be famous for its cider but according to Cask Marque, the pipes pouring that scrumpy are probably dirty. The report found that across draught cider, stout, lager, and ale served in the region, an average of 40.8 percent comes from unclean beer lines. Wales was close behind for most dirty pints pulled, with 39 percent of its beer lines falling short of good hygiene standards.Read more on MUNCHIES.