Tips to find where sump pump is discharging
Standard septic tracing dyes are non-toxic (important becasue you are dumping them into wherever your sump discharges) and typically fluorescent and fairly concentrated. Green and red are common. Blue seems to be less common, but available. In your case it likely does not matter, just pick a color, put it in, and go hunting - also see if it &quot;comes back&quot; with the late-draining pipe inflow.