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Moment based method of estimation of parameters for fitting any distribution is a common practice in the theory of statistics. But the method of estimation through moments is not always satisfactory. Hosking (1990) introduced an alternative and more robust method of estimation of parameters by L-moments. L-moments are expectations of certain linear combination of order statistics. In the present study, we apply the above method of L-moments for testing the heterogeneity due to rainfall of different districts in West Bengal and the regional frequency analysis of maximum monthly rainfall in the said districts of West Bengal. The study involves the data for 102 years (1901-2002) of monthly data for the monsoon months. The result of homogeneity test shows that the 18 districts in West Bengal are not homogenous for the rainfall in monsoon months (June, July, August and September). Using the results, the Return Periods of all the districts under study have been developed with their respective trends for the making the containment structure.