TABLE 3.

Microbiological and physicochemical parameters of water samples concentrated for Giardia and Cryptosporidium analyses

Sample	Value for parameter:
	37°C total plate count (no. of organisms/ml)	pH	Electric conductivity (μS/cm at 25°C)	Color (Pt-Co units)	Turbidity (NTU)	Total organic carbon (mg/liter)
Treated sewage discharge	NDa	6.6–6.9	780–800	20–50	0.8–1.0	ND
River or creek water	380–2,900	7.0–7.9	65–780	52–160	3.5–120	4.0–9.0
Drinking water	0–600	6.5–9.0	48–60	2–15	<0.5–2	1–2

^aND, not determined.