| Substance |
MCL |
MCLG |
Amount Detected |
Range |
Violation |
Typical Source |
| Arsenic (ppb) |
50 |
0 |
3.2 |
1.7-3.2 |
No |
Erosion of natural deposits;
runoff from orchards; Runoff from glass and electronics production
wastes |
| Atrazine (ppb) |
3 |
3 |
0.14 |
0.14-0.14 |
No |
Runoff from
herbicide used on row crops. |
| Barium (ppm) |
2 |
2 |
0.018 |
0.016-0.018 |
No |
Discharge of drilling wastes;
Discharge from metal refineries; Erosion of natural deposit |
| Chromium (ppb) |
100 |
100 |
3.7 |
3.1-3.7 |
No |
Discharge from steel and pulp
mills; Erosion of natural deposits |
| Fluoride (ppm) |
4 |
4 |
1.7 |
1.3-1.7 |
No |
Erosion of natural deposits;
Water additive which promotes strong teeth; Discharge from
fertilizer and aluminum factories |
| Nitrate (ppm) |
10 |
10 |
3.1 |
2.7-3.1 |
No |
Runoff from fertilizer use;
Leaching from septic tanks, sewage; Erosion of natural deposits |
| Radon (pCi/L) (2001) |
10 |
10 |
3.67 |
NA |
No |
Erosion of natural deposits |
| Selenium (ppb) |
50 |
50 |
0.21 |
14-21 |
No |
Discharge from petroleum and
metal refineries; Erosion of natural deposits; Discharge from mines |
| Turbidity (NTU)1 |
TT |
NA |
0.47 |
0.50-0.75 |
No |
Soil Runoff |
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