Arsenic Rule

Arsenic is an inorganic contaminant regulated under the Chemical Contaminant Rules. All community water systems and non-transient non-community water systems, which have their own source, must comply with the arsenic requirements.

Tammy Lamphear

Rule Manager

P: 701-328-5295

Fact Sheet


  • What is the maximum contaminant level (MCL) and maximum contaminant level goal (MCLG) for arsenic?
    • The MCL for arsenic is 0.010 mg/L and the MCLG is 0.
  • When and why did the MCL for arsenic change?
  • What are the potential health effects from long term exposure over the MCL?
    • Skin damage or problems with circulatory systems, and may have increased risk of cancer.
  • What are the possible sources of arsenic contamination in drinking water?
    • Erosion of natural deposits, runoff from agricultural or industrial activities.