"The tenant complained that water is ponding in the parking area." or, "Due to the ponding of water in the lower lying areas, mosquitoes became a nuisance."
"ponding" is not accepted by spellcheckers and I can not find a reference in dictionaries either.
In Namibia and South Africa "ponding" is used in spoken and written English extensively, especially in technical reports.
The question is whether this is a valid verb or not. If not, what verb would describe the formation of puddles?