TDS is a measure of all constituents dissolved in water. The inorganic anions dissolved in water could include carbonates, chlorides, sulfates and nitrates. The inorganic cations could include sodium, potassium, calcium and magnesium. Under EPC recommendations, IDNR is working to revise the current interim site-specific TDS standard based on new information collected.

Issue Papers:

• TDS Issue Paper (*.pdf file)
• Sulfate Issue Paper (*.pdf file)