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Secondary Treatment

hand holding glass of water
Environment, Great Lakes, and Energy

Secondary Treatment

A facility with a secondary treatment water system is one that receives potable water from a public water supply and adds chemicals to provide additional treatment to their drinking water. Treated water is then delivered to consumers through the facility premise plumbing. Often, these facilities are using chemical disinfectants to reduce the risk of opportunistic pathogens such as Legionella from occurring within premise plumbing. Other facilities add chemicals for corrosion control to reduce exposure to lead, copper, and other metals that may leach from premise plumbing and water fixtures. Such water systems are considered treatment facilities, and as such, are subject to regulations as public water supplies under the Michigan Safe Drinking Water Act (Act 399). These water systems will be classified and regulated as either community water supplies or noncommunity water supplies. Facilities planning to install treatment as described here must submit the following three applications before installation:

As a regulated Public Water Supply, the facility must contract a certified operator to manage the system and submit monthly operation reports and laboratory results as required by the Safe Drinking Water Rules.