With a monthly salary of 10,000, you can live a "well-off life" in Tianjin. Compared with other prosperous cities, the consumption in Tianjin is indeed much lower. The usual water and electricity rent is similar to that of many second-tier cities.
The food cost in Tianjin is not too high, a set meal is about 12 yuan, and seafood is not expensive, which is quite good.