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Rocket Fuel in Drinking Water: Table 1: Perchlorate-contaminated drinking water sources in California
Table 1. There are hundreds of perchlorate-contaminated drinking water sources in California.
|
County |
Contaminated water sources (1) |
Contaminated water systems (1) |
Maximum perchlorate level detected (ppb) (2) |
Contaminated sources still active (2) |
Average level (ppb) in contaminated active sources |
|
Los Angeles |
127 |
37 |
159 |
107 |
12.1 |
|
Orange |
15 |
7 |
10.7 |
12 |
6.3 |
|
Riverside |
49 |
8 |
65 |
40 |
9.7 |
|
Sacramento |
13 |
3 |
400 |
0 |
- |
|
San Bernardino |
78 |
16 |
820 |
50 |
18.3 |
|
San Diego |
1 |
1 |
4.7 |
1 |
4.5 |
|
Santa Clara (3) |
133 |
4 |
8.5 |
3 |
6.2 |
|
Sonoma |
1 |
1 |
5 |
1 |
4.5 |
|
Tulare |
7 |
3 |
9.1 |
1 |
5.8 |
|
Ventura |
2 |
1 |
20 |
2 |
11.6 |
|
Statewide |
426 |
81 |
820 |
217 |
8.7 |
Source: EWG 2003
References
- California Department of Health Services (CADHS). 2003. California’s experience with perchlorate in drinking water. February 5, 2003. http://www.dhs.ca.gov/ps/ddwem/chemicals/perchl/monitoringupdate.htm
Sweeney, F. 2003. Contamination may have spread; more San Martin wells to be tested. February 23, 2003. San Jose Mercury News.
- EWG analysis of California Department of Health Services (CADHS) drinking water quality database from June 2002 (CADHS 2002).
- Number includes 4 public drinking water wells and 129 private wells. A large new perchlorate plume in the San Martin area of Santa Clara County was discovered in late 2002, but testing of all potentially affected wells has not been completed. Wells that tested positive for perchlorate contamination but had concentrations lower than the "reporting limit" of 4 ppb were not included in this number.
