What are the sources of contaminants in drinking water?
The Sources of Contaminant in Drinking Water Table (pdf; 112 Kb) lists the sources of the contaminants in drinking water. It was derived from the EPA’s Drinking Water Contaminants webpage (exits to US EPA website). How often are Tucson Water sources tested to comply with the Drinking Water Regulations? Monitoring requirements, including the frequencies and locations, are specified within the drinking water regulations. In general, monitoring is required at the distribution system or at the Entry-Point-to-the- Distribution-System (EPDS). You may also view a map of the distribution system sample points. The monitoring frequencies are dependent on the results of the previous sampling events. More frequent monitoring is implemented when a level approaches the MCL in order to make the necessary adjustments to prevent an MCL exceedance, including shutting the well down. With ADEQ approval, a monitoring reduction is used when a contaminant is not detected over a specified time period. The Dri
