Which of these is a binucleated, flagellated protozoan?

Which of these is NOT a likely source of contamination for ocean water and beaches? 

Even though well water moves through layers of sand and gravel, it is still heavily contaminated.

The presence-absence test is especially useful because it is quantitative.

Which of these represents the maximum contaminant level (MCL) for coliforms in finished water?

Which of these is NOT a surrogate measure used to determine the efficiency of waste water treatment methods?

Regulations governing bottled water include all of the following, except:

The major opposition for using chlorine to purify water was

Increased water sports can lead to an increase in the release of fuel and other chemicals in the waterways.

Contamination of fresh water line by Vibrio cholera when an oil rig was being towed introduced the organism into the drinking water in the Gulf Coast outbreak.