LINK / CITE ADD TO WORD LIST. adjective. The definition of harmful is something that causes damage or is able to be hurtful. A chemical that causes you to become sick is an example of a chemical that would be described as harmful. causing or able to cause harm; hurtful. adjective.
The most common way to become infected with giardia is after swallowing contaminated water. Giardia parasites are found in lakes, ponds, rivers and streams worldwide, as well as in municipal water supplies, wells, cisterns, swimming pools, water parks and spas. Ground and surface water can become contaminated from agricultural runoff, wastewater discharge or animal feces.
Full Catalog. If you go down to the woods today, you're in for a big surprise -- if you drink contaminated water. Learn how to keep today from being the day you get Giardia. 1  A good reminder for campers to be careful about the water they drinkâ¦. â¦ 2 and where they swim.