Nasir Lamin wasted a penalty kick that came the way of New Edubiase United before the hosts were punished by Kwaku Adzuanze to give the visitors an important victory.
The Wa lads in their bid to win the league pushed the New Edubiase boys further down the relegation hole.
Bottom club New Edubiase looked like a side that had rediscovered their form in their bid to avoid relegation, after they earned an away league win against Techiman City on match day 25.
However, they returned home and threw away an opportunity to improve their chances of survival, when they wasted a penalty kick and rather allowed the visitors to punish them.
Wa All Stars made their intent to clinch this season's Ghana Premier League clear after the victory, with four games to end the season. But Aduana Stars who also won on match day 26 at home are making the race for the league title tighter, since they are separated by just a point.