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Practical Considerations for Implementing Nitrosamine Control Strategies

The US Environmental Protection Agency included five nitrosamines, including N‐nitrosodimethylamine (NDMA), on the fourth Contaminant Candidate List, indicating its consideration of these contaminants for potential regulatory determination. If nitrosamines are regulated, affected water systems and regulators will need to consider simultaneous compliance, risk balancing, operational, and cost impacts of implementing control strategies. This study showed that site‐specific data are lacking on the source(s) of NDMA, hindering the ability of a water utility to identify optimal control strategies for their system. A framework is presented to guide water systems through initial steps to assess nitrosamine sources, control strategies, and unintended consequences as they plan for potential regulations.