Hi,
Piers Clark of Isle Utilities mentioned that a test for inactivated COVID 19 in wastewater was being developed. This would be useful to know particularly in Urban areas 

Link to post below.
www.linkedin.com/pulse/how-water-sector-...O%2FHSTvXJJNkA%3D%3D

Also this on Susana website.
forum.susana.org/testing-sewage-for-earl...about-covid-19#29761

Dear All, 
 
Administrative Staff College of India (ASCI) is doing a literature review on COVID-19 in sanitation and wastewater. We are currently collecting protocols for sampling, handling and testing.

It would be great if the members on the forum could help us identifying papers for the protocols. 

Thank You

Dear all,
In Chennai, presence of COVID-19 RNA has been detected in sewage samples were collected from pumping stations. 

"According to sources, the presence of the COVID-19 viral RNA was detected in two samples and a correlation of confirmed cases was also established in the locations from where samples were lifted."

Source: www.thehindu.com/news/cities/chennai/cor...7RvjuSNDvyygPZ_iRHpQ  

Hello Nitya, 
What you are trying to do is not very clear to me. Maybe more clarification on the objective and expected outcome will be good. 
For now, from what you have written I am thinking you are trying to determine the presence of COVID19 in faeces and its survival in onsite sanitation systems (OSSs), whiles looking at how the virus can be transferred from these OSSs into communities with users been carriers due to the bad designs of these OSSs?
Please clarify.