Mayor: Some residents complain that the city has no right to require homeowners to connect to city water services, even though we are doing so in order to ensure public health and safety.
Evidence
We are requiring homeowners to connect to city water services in order to ensure public health and safety.
We will charge the homeowners a fair market price for the service.
Our plan will benefit all of the city’s residents by increasing city revenue and by making the city a healthier and safer place in which to live.
Conclusion
They [the residents who complain] are wrong [the city has a right to require homeowners to connect to city water services].
Evaluate / Goal
A valid argument should explicitly state everything that's required in order for the evidence to completely support the conclusion.
This argument doesn't explicitly state that:
If connecting to city water ensures public health and safety then the city has a right to require it;
ensures health and safety → right to require
If the city charges homeowners a fair market price for the service then the city has a right to require it;
fair price → right to require
or,
If the plan benefits all of the city's residents by increasing revenue and making the city a healthier and safer place, the city has a right to require it.
benefits all residents → right to require
A correct answer is likely to make one or more of these connections.