recognizing the various indications of CBR contamination of their water point as follows:

An unusual taste or odor

Dead fish and animals in unusually large numbers

A sudden drop in normal pH values or a pH value of less than 6.0

High readings on radiac equipment

Personnel developing fevers, diarrhea, cramps, vomiting, and so forth

Burning sensation of skin, eyes, and nose

Runny eyes, nose, and mouth

If CBR contamination of a water source is suspected, have your crew don appropriate protective clothing and equipment before they start tests for determining the type and extent of the problem. For example, water contaminated with a nerve agent should not be allowed to come in contact with the skin nor the vapors be inhaled. Therefore, wearing a protective mask and gloves would be necessary before checking for nerve agent contamination.

Chemical Contamination

Chemical agents are classified in seven categories: nerve, blister, blood, choking, vomiting, irritant, and incapacitating. The nerve agents, blister agents, and agents containing cyanide are most dangerous because they are highly poisonous. Some are soluble in water and either are slow to decompose in solution or remain poisonous after decomposition. Water supplies are likely to become contaminated as an incidental result of widespread chemical attack, rather than as a result of direct attack on the water supply. Chemical agents are colorless, odorless, and tasteless. The first indication of their use could be the appearance of casualties. The chemicals affect people, animals, and plants but leave homes, factories, and other facilities untouched.

Biological Contamination

Water is a carrier of many organisms that cause intestinal disease. An epidemic of one of these diseases among troops can be more devastating than enemy action and can cause great damage to morale as well as health. A heavy responsibility thus rests upon the Utilitiesman, and vigilance over water purification equipment and procedures should never be relaxed. It is emphasized that water treatment methods to be used when certain chlorine-resistant organisms are encountered should be prescribed by a representative of the medical officer. The representative will recognize or anticipate the presence of these organisms and recommend such additional chlorination or other treatment methods as may be necessary.

A waterborne disease rarely produces symptoms in its victim immediately after the victim has consumed the contaminated water. A period of time, known as the incubation period, must pass before the victim comes down with the disease. During this incubation period, the disease organisms are growing and multiplying. Absence of symptoms for several days after untreated water has been consumed is, therefore, no guarantee that the water is safe. Also, absence of disease among the local inhabitants is no assurance of safety because they may have developed immunity.

Types of waterborne diseases include typhoid fever, paratyphoid fever, cholera, bacillary dysentery, amebic dysentery, common diarrhea, infectious hepatitis, and schistosomiasis. Biological water contamination causes little, if any, change in