Аннотация:Results of long-term monitoring of circumstellar water maser sources in red supergiants are reviewed. The observations were carried out in 1980–2006 on the RT-22 radio telescope at Pushchino Radio Astronomy Observatory. We discuss the results for the semiregular variable M-supergiant VX Sgr and non-variable M-supergiant IRC–10414. In addition to our single-dish data, very-long-baseline interferometry results are invoked. VX Sgr and IRC–10414 display a characteristic water line profile, which suggests the presence of a rotating circumstellar disc and a bipolar outflow.