An overview is given of the analysis of more than a decade of H2O maser data from our monitoring program. We find the maser emission to generally depend on the luminosity of the YSO as well as on the geometry of the SFR. There appears to be a threshold luminosity of a few times 10**4 Lsol above and below which we find different maser characteristics.

9 pages, 1 table, 11 figures. Accepted for publ. in Ap&SpSci. Refereed contribution to "Dense Molecular Gas around Protostars and in Galactic Nuclei", European Workshop 2004 on Astronomical Molecules. Eds. Y. Hagiwara, W.A. Baan, H.J. van Langevelde