N‐nitrosodimethylamine (NDMA) and other nitrosamines have been reported in drinking and recycled water at low parts‐per‐trillion levels, both as contaminants and disinfection byproducts. Many of these nitrosamines cause cancer in animals and are probable human carcinogens. In this study, three existing analytical methods were expanded, refined, and validated for the analysis of NDMA and seven other nitrosamines in potable, waste, and recycled water. Method detection limits for a solid‐phase extraction (SPE) method and a cartridge SPE (CSPE) coupled with gas chromatography–tandem mass spectrometry were 0.7–0.8 ng/L for NDMA and 0.3–1.4 ng/L for other nitrosamines. The micro‐liquid–liquid extraction (MLLE) method that was developed used less volume and was effective at analyzing the different sample matrixes but yielded higher detection limits (2–4 ng/L). NDMA was the only nitrosamine detected in potable water; however N‐nitrosodiethylamine, N‐nitrosomorpholine, N‐nitrosopiperidine, N‐nitrosodi‐N‐butylamine, and N‐nitrosopyrrolidine were present in other matrixes tested. The SPE methods and the MLLE method have been submitted for inclusion in the next revision of Standard Methods for the Examination of Water and Wastewater, and the CSPE method will be submitted for approval in the future.

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A pilot‐scale pipe loop test was conducted to evaluate the effects of desalinated seawater on corrosion, lead release, disinfectant decay, and formation of disinfection by‐products in the distribution system. Results indicated that the desalinated blend water did not increase corrosion of unlined cast‐iron pipes, coated cement‐lined pipes, or copper pipes. However, aluminum release from uncoated cement‐lined pipes was increased. The blend water also increased lead release from leaded solder. These results agreed with the predictions from corrosion indexes and earlier bench‐scale testing. Orthophosphate (1 mg/L) added to mitigate lead release was ineffective. Adding phosphate increased bacterial growth in unlined cast‐iron pipes and solder. Although chloramine decay was increased by desalinated water, this effect can be managed by controlling bromide levels and either reboosting or preforming chloramine. Desalinated blend water did not increase biological activity. In addition, the blend water decreased the formation of total trihalomethanes and haloacetic acids as expected but increased nitrosodimethylamine for unknown reasons.