- a) contain a plan for monitoring total ammonia-N, free ammonia-N, nitrite-N, nitrate-N, monochloramine residual, dichloramine residual, and total chlorine residual;
- b) contain system specific levels of the chemicals in subsection (a) when action must be taken;
- c) contain specific corrective actions to be taken if the levels in subsection (b) are exceeded; and
- d) be maintained on site and made available to the Agency, upon request.
Any community water supply distributing water without a free chlorine residual must create a Nitrification Action Plan (NAP). The NAP must: