Wastewater Contaminant Sampling

USGS scientists collected water-quality samples from 121 locations as part of two national-scale reconnaissance studies on the occurrence of organic wastewater contaminants in ground water and untreated sources of drinking water across the United States. All of the samples were raw water, collected from sampling ports at wellheads for ground water (A) or at intake structures for surface water (B) before any treatment or processing.