I recall my first visit to Rivertowne Pour House in Monroeville about a decade ago; I was impressed that they were able to keep 18 taps pouring their own beer, brewed on a small, in-house system.

The hard work it took to keep all that beer flowing back then was a precursor to Rivertowne Brewing’s position now: distributing its staples in six states while still being nimble enough to experiment … and come up with great results.

The growth that came with the startup of its production brewery in Murrysville — Rivertowne sells beer in Pennsylvania, Ohio, West Virginia, New Jersey, North Carolina and Florida, where the brand is especially popular in Bradenton, the spring home of the Pirates — has given brewmaster Andrew Maxwell, who gave up a job as a chemist with a pharmaceutical company to follow his passion for brewing, a chance to continue tinkering while maintaining an almost-obsessive watch over the liquids he’s in charge of making; talk to Mr. Maxwell for 30 minutes, and the words “quality control” will come up at least a half-dozen times.

Much of the tinkering comes on the system in the Monroeville Pour House, which Mr. Maxwell said has practically become an extension of his body. Need an amber that features honey and chamomile? That’s where it would start. Turning a one-off pineapple beer into a year-round sensation? Here’s a spoiler for a bonus video to be released next week: it happened in Monroeville as well.

Rivertowne grew up in Pittsburgh, and even as the brand has grown, Mr. Maxwell and founder Christian Fyke still acknowledge the brewery’s roots. Rivertowne’s annual Rhythm and Brews party is scheduled for Aug. 27 at Tall Trees Amphitheater in Monroeville. Proceeds raised from the event will result in a hefty donation to local charities; the brewery’s other annual events — haunted brewery tours in October, the Hibernation party in January and the Jahla party in April all do the same.

You can now find Rivertowne beers in five other states. You can drink Old Wylie’s IPA in the the Hall of Fame Club at PNC Park. But you can still find the experiments of Mr. Maxwell and the other staff brewers at Rivertowne’s four restaurants or at its brewery tap room — it will never be too big for that.