Table 2. Recreational Water Venues with Artificial Features Associated with U.S. PAM Cases, 1962–2016.

Venue	Year	County, State	Bottom composition	Water Treatment	Water Source	Size of water body	Other Features	Number of associated PAM cases
Artificial whitewater river (this report)	2016	Mecklenburg, NC	Concrete	200-μm particulate filter, UV, manual, intermittent chlorination	Municipal drinking water and wells	∼11.5 million gallons	Closed-loop, recirculated system; whitewater kayaking	1
Water Park	2013	Pulaski, AR	Sand	Chlorine, pH balanced, and chemicals	Spring and well	3.5 acres	Slides	2
Campground Lake	2009	Madison, FL	Sand	Chlorine	Deep well	1.5 acres	Slide	1
Watersports Complex	2007,2009	Orange, FL	Sand	Untreated, monthly testing	Rain		Waterskiing and wakeboarding	2
Water Park	1979,1980	Orange, FL	Sand	“Unique filtration system”	Lake	6 acres	Slides	2
Lake	1977	Richmond, GA	Sand	Untreated			Cement retaining walls	1
Lake	1950s and 60s	Chesterfield, VA	Likely Sand	Unknown	Unknown		Slides, diving boards, fountains	4