The backwash water from swimming pools contains large accumulations of bacteria and chemicals. This water should never be released onto the ground. Discharge backwash into it's own subsurface disposal system, not the home's septic system. It is illegal to discharge backwash within 50 feet of a water supply source or tributary.
During the summer, weed and algae growth increases in ponds. If water is stagnant, ponds also risk becoming a mosquito breeding area. The use of chemical pesticides, herbicides or oils to control such problems requires CT DEP approval for each application.
The release of fish into ponds, requires a permit from the DEP. Never release carp or goldfish into a pond as it is illegal—these fish produce high levels of waste, quickly degrading water quality. In addition, do no feed waterfowl; their overpopulation quickly overburdens ponds with waste.