Inorganics can include a combination of metals, salts, compounds, particles, and mineral complexes and, depending on the inorganic, can be categorized as being regulated under Primary or Secondary Drinking Water Standards and also as an unregulated contaminant with No Standard.
Some water quality parameters do not have a specific Primary or Secondary Drinking Water Standard. We have classified these "contaminants" as unregulated contaminants with No Standard. These parameters may lack a specific primary or secondary drinking water limit for a number of reasons, which may include a standard that is being evaluated, but which has not yet been established. In some cases, there is lack of scientifically based information to create a formal standard, but the regulatory agency may set a health or aesthetic advisory. For these parameters, we have attempted to identify and highlight any state or EPA health advisories or industry guidelines. For some, the parameter does not directly impact the water quality, but indirectly impacts the secondary drinking water standards, but the effect is based on a combination of contaminants and not just one contaminant.