RNA concentration , could allow description of " the real dynamic " of the virus spreading into the population , allowing for a direct comparison between the three waves . Our data showed that in the Greater Paris area , the first wave showed more highly concentrated samples ( i.e. samples with about 1 million UG / L ) than the 2nd and 3rd waves ( see Fig . 3 ) . Quantitative assessment of SARS - CoV-2 genomes in wastewaters demonstrates the impact of prevention measures such as lockdown or curfew which can Fig . 4 . Relationship between log of the concentration of SARS - CoV-2 genome and the log number of incidence number . Panel A regional scale , in blue average of the 5 WWTP , in red Lowess of the same data . Panel B , in blue SEM WWTP , in red MAV . panel C relationship between SEV and departmental incidence number . Panel D relation between STV and the departmental incidence number panel E , relationship for SEC and Paris incidence panel F , linear regression of all WWTP and the regional average . be once again observed in this project . Some general modeling papers have postulated the decrease of the wave intensity   in accordance with our data .