City manager Pep Guardiola had claimed he would be on the golf course on Sunday afternoon and would not watch the game.
His decision to forego the match looked justified considering West Brom's terrible form, but the visitors easily coped with United's ponderous attacks and looked risky going forward.
Speaking after the win over Tottenham, Guardiola admitted winning the title in England would be one of the greatest achievements of his glittering career.
Jose Mourinho's men should have had a first-half penalty after Craig Dawson caught Ander Herrera, but complacency seeped in and the Baggies showed fight under caretaker boss Darren Moore that has been sorely lacking this season.
After the match at Old Trafford, the manager himself was very open and realistic about how Manchester United played.
It wasn't the best day for Romelu Lukaku against his former club, either.
All the same it was hard to find any plausible excuse for a team that finished with Alexis Sánchez, Romelu Lukaku, Marcus Rashford, Anthony Martial and Juan Mata on the pitch but barely landed a glove on willing but limited opponents.
However, United's record £89m signing followed it up with a underwhelming display on the left of midfield in a 4-3-3 system.
He said: "We've got faith in one another, the players, the staff. Things have gone a bit by the wayside this year". Everything was slow. Everyone was one more touch, one more trick, one more flick, one more turn. We always gave them the opportunity to be solid, compact in the low block with strong physical players.More news: Wetherspoons deletes all social media accounts after constant 'online abuse'
"I'm proud for players and staff and way they have acquitted themselves today. We wanted to dribble and dribble, and everything was complicated".
Victory against Spurs at Wembley had given City an unassailable position to clinch the title.
City originally had the chance to win the league against United last week but a win for the Red Devils only delayed the inevitable by eight days.
However, the fans of West Brom - and certainly Manchester City - are likely to remember it for quite some time.
Even so, he is still managing to outperform Pogba in a number of key metrics over the Premier League season.
That moment came in the 73rd minute when Jay Rodriguez finished off a wayward header by United's Nemanja Matic on the corner.
Meanwhile, Vincent Kompany barely let City's title celebrations begin before setting his side the challenge of making it two in a row next season.
Bottom club West Brom beat Man United 1-0 to hand Man City the EPL title.
More importantly, though, it means Pep Guardiola's City team can not now be caught at the top of the table, thus handing the Catalan coach his first Premier League crown in just his second year in English football.