The cost of providing safe drinking water -- finding a water supply, treating the water, delivering the water, and maintaining the system -- will continue to be a challenge.
(The cost of providing safe drinking water -- finding a water supply, treating the water, delivering the water, and maintaining the system; will continue; ) (The cost of providing safe drinking water -- finding a water supply, treating the water, delivering the water, and maintaining the system; to be; a challenge)
The cost of providing safe drinking water -- finding a water supply, treating the water, delivering the water, and maintaining the system The cost of providing safe drinking water -- finding a water supply, treating the water, delivering the water, and maintaining the system
will continue to be
a challenge