Inorganic Chemicals

ContaminantDescriptionEPA Designation
AntimonyAntimony is a metal that enters water from petroleum refinery pollution, fire retardants, ceramics, electronics and solder.Regulated
ArsenicArsenic contaminates drinking water due to mining runoff, erosion of natural deposits, emissions from glass and electronics processing and the use of arsenical compounds as wood preservatives and pesticides.Regulated
AsbestosAsbestos is a mineral fiber introduced into water by the dissolution of asbestos-containing minerals and from decay of asbestos cement in water mains. Regulated
BariumBarium is a mineral that enters drinking water through drilling and mining waste runoff, discharges from chemical industries and erosion of natural deposits.Regulated
BerylliumBeryllium is a metal associated with metal refineries and combustion of fossil fuels, especially coal burning; it is released into the environment from electrical, aerospace and defense industries.Regulated
CadmiumCadmium is a metal used in the steel and plastic industries; it is released from corrosion of galvanized pipes, runoff from metal refineries, waste batteries and paints; contamination from fertilizers; and erosion of natural deposits.Regulated
ChromiumChromium is a metal that pollutes drinking water due to discharge from steel and pulp mills and erosion of natural deposits.Regulated
CopperCopper is a naturally occuring metal and drinking water contaminant that enters tap water by corrosion of household plumbing systems and erosion of natural deposits.Regulated
CyanideCyanide is a chemical used in mining and steel/metal, plastic, and pesticide manufacturing; it is applied to roads as road salts, and small quantities occur naturally in some plants.Regulated
FluorideFluoride-containing compounds are used in topical and systemic fluoride therapy for preventing tooth decay. They are used for water fluoridation and in many products associated with oral hygiene.[12] Originally, sodium fluoride was used to fluoridate wateRegulated
LeadLead is a metal that enters water by corrosion of household plumbing systems, discharge of industrial pollution and erosion of natural deposits.Regulated
MercuryMercury is a metal from refinery and factory pollution, coal burning, landfill and agricultural runoff and erosion of natural deposits.Regulated
NitrateNitrate enters drinking water sources from fertilizer runoff, leaching septic tanks, and erosion of natural deposits; it is also emitted by chemical, petrochemical and metal-finishing industries.Regulated
NitriteNitrite is a chemical that enters water from fertilizer runoff, leaching septic tanks, and erosion of natural deposits.Regulated
SeleniumSelenium is a naturally occurring element that contaminates water due to mining or petrolum refining, fly-ash from coal-burning power plants, and irrigation of arid farmland soils high in selenium.Regulated
ThalliumThallium is a highly toxic metal that contaminates the environment due to leaching from ore-processing sites, discharge from electronics, glass, and drug factories and historical use as rodenticideRegulated