Degree of Hazard:
Non-health Hazard: Pollutants that will not cause illness or death.
Health Hazard: Contaminants that cause illness or death.
http://www.tn.gov/environment/dws/pdf/crossconnection.pdf

(6) Degree of hazard. The term "degree of hazard" means whether the hazard or potential hazard is a "pollution" (non-health) hazard, or a "contamination" (health) hazard. The degree of hazard shall be determined by the town from the evaluation of conditions within a private water system and the use to which a property connected to public system is put.
(7) Health hazard. The term "health hazard" means an actual or potential threat of contamination of a physical, chemical, biological, pathogenic or toxic nature to the public or private water system to such a degree or intensity that there would be a danger to health. Examples of waterborne health hazards include, but are not limited to:
(...)
(9) Pollution or Non-health Hazard. The term "pollution or non-health hazard" means an actual or potential threat to the quality of water of the town’s public system or a private potable water system. A non-health hazard is one that, if introduced into the public water supply system, could be a nuisance to water users, but would not adversely affect human health.
http://www.townofcary.org/Departments/Public_Works_and_Utili...