Table 3. Outside California, more than 100 drinking water sources in 19 states are known to be contaminated with perchlorate.

*Parentheses indicates unconfirmed detections. PPB = parts per billion.
**Number of contaminated sources in these systems not available

Source: EWG 2003

References:

1. Associated Press (AP). 2002. High levels of chemical found in West Texas drinking water. April 23, 2002.
2. Clean Water Report (CWR). 2002. Possible perchlorate lessons to learn as pollutant progresses to city wells; Maryland. August 12, 2002.
3. Environmental Protection Agency (EPA). 2001. Memorandum re: Perchlorate occurrence table and maps. March 2, 2001.
4. Environmental Protection Agency (EPA). 2003b. Data downloaded from EPA’s Unregulated Contaminant Monitoring Rule database. Data as of January 2003. http://www.epa.gov/safewater/data/ucmrgetdata.html.
5. Gullick, RW; Lechevallier, MW; Barhorst, TS. 2001. Occurrence of perchlorate in drinking water sources. American Water Works Association Journal. Jan 2001: 66-76.
6. Rogers, K. 2003. Company seeks help with cleanup. Las Vegas Review-Journal. January 11, 2003.
7. Sweeney, F. 2003. Contamination may have spread; more San Martin wells to be tested. February 23, 2003. San Jose Mercury News.