I have a small (50 sf) "pond" that may be supplied by a spring. It has slightly moving water. It did not freeze during the most recent cold weather. Where or how can I get the water tested to confirm or deny the water is clean/not poluted.
Montgomery County Maryland
Small pond water testing can be obtained through Penn State, https://agsci.psu.edu/
Realize that water quality can change quickly depending on water source.