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In response to a number of incidents at treatment plants for public water supplies resulting in the need for emergency measures to be taken, MassDEP has derived Immediate Action Levels for a number of indicator parameters for commonly used treatment chemicals. These limits are intended for use by plant operators to identify when a situation involving chemical over-feeds or use of the wrong chemical has occurred of sufficient gravity to require the implementation of emergency response procedures. These parameters are frequently and routinely monitored in the treatment plant. In addition to the levels listed below, water delivered to the entry point of the distribution system is also required to meet various other federal and state standards and guidelines (see listing at: http://www.mass.gov/dep/water/drinking/standards/dwstand.htm).