The Safe Drinking Water Act (SDWA) defines a water contaminant as any physical chemical, biological, or radiological substance or matter in water. The law charges EPA to set legal limits on the levels of certain contaminants in drinking water.
You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Read more about existing National Primary and Secondary Drinking Water Regulation (PDF)(6 pp, 1 MB)
- CFR Part 141: National Primary Drinking Water Implementation Regulations (PDF)(225 pp, 856 K)
- CFR PART 142: National Primary Drinking Water Implementation Regulations (PDF)(56 pp, 288 K)
- CFR Part 143: National Secondary Drinking Water Regulations (PDF)(3 pp, 131 K)