|
Contaminant
|
MCLG
|
MCL
|
Ashburton
Plant
|
Source
|
|
|
|
|
HLD (ppm)
|
Range
|
|
|
Antimony
|
6 ppb
|
6 ppb
|
<0.002
|
-
|
Discharge
from petroleum refineries; fire retardants; ceramics; electronics;
solder. |
|
Arsenic
|
n/a
|
50 ppb
|
<0.002
|
-
|
Erosion
of natural deposits; Runoff from orchards; Runoff from glass and
electronics production wastes. |
|
Barium
|
2 ppm
|
2 ppm
|
<0.02
|
<0.02
|
Discharge
of drilling wastes; Discharge from metal refineries; Erosion of
natural deposits. |
|
Beryllium
|
4 ppb
|
4 ppb
|
<0.0005
|
-
|
Discharge
from metal refineries and coal-burning factories; Discharge from
electrical, aerospace, and defense industries. |
|
Cadmium
|
5 ppb
|
5 ppb
|
<0.0005
|
-
|
Corrosion of galvanized
pipes; Erosion of natural deposits; Discharge from metal refineries;
runoff from waste batteries and paints. |
|
Chromium
|
100ppb
|
100 ppb
|
<0.001
|
-
|
Discharge
from steel and pulp mills; Erosion of natural deposits. |
|
Copper
|
AL=1.3
ppm
|
AL=1.3
ppm
|
0.003
|
-
|
Corrosion
of household plumbing systems; Erosion of natural deposits; Leaching
from wood preservatives. |
|
Fluoride
|
4 ppm
|
4 ppm
|
1.45
|
<
0.1- 1.45
|
Erosion
of natural deposits; Water additive that promotes strong teeth;
Discharge from fertilizer and aluminum factories. |
|
Lead
|
0 ppb
|
AL=15
ppb
|
<0.002
|
-
|
Corrosion
of household plumbing systems; Erosion of natural deposits. |
|
Mercury (inorganic)
|
2 ppb
|
2 ppb
|
<0.0005
|
-
|
Erosion
of natural deposits; Discharge from refineries and factories;
Runoff from landfills; Runoff from cropland. |
|
Nitrate
(as Nitrogen)
|
10 ppm
|
10 ppm
|
1.69
|
-
|
Runoff
from fertilizer use; Leaching from septic tanks, sewage; Erosion
of natural deposits. |
|
Nitrite
(as Nitrogen)
|
1 ppm
|
1 ppm
|
<0.01
|
-
|
Runoff
from fertilizer use; Leaching from septic tanks, sewage; natural
erosion. |
|
Selenium
|
50 ppb
|
50 ppb
|
<0.005
|
-
|
Discharge
from petroleum and metal refineries; Erosion of natural deposits;
Discharge from mines. |
|
Thallium
|
0.5 ppb
|
2 ppb
(.002 ppm)
|
<0.001
|
-
|
Leaching from ore-processing
sites; Discharge from electronics, glass, and drug factories. |
|
Contaminant
|
MCLG
|
MCL
|
Montebello
Plants
|
Source
|
|
|
|
|
HLD
(ppm)
|
Range
|
|
|
Antimony
|
6 ppb
|
6 ppb
|
<0.002
|
-
|
Discharge
from petroleum refineries; fire retardants; ceramics; electronics;
solder. |
|
Arsenic
|
n/a
|
50 ppb
|
<0.002
|
-
|
Erosion
of natural deposits; Runoff from orchards; Runoff from glass and
electronics production wastes. |
|
Barium
|
2 ppm
|
2 ppm
|
0.03
|
< 0.02-0.03
|
Discharge
of drilling wastes; Discharge from metal refineries; Erosion of
natural deposits. |
|
Beryllium
|
4 ppb
|
4 ppb
|
<0.0005
|
-
|
Discharge
from metal refineries and coal-burning factories; Discharge from
electrical, aerospace, and defense industries. |
|
Cadmium
|
5
ppb
|
5 ppb
|
<0.0005
|
-
|
Corrosion of galvanized pipes; Erosion of natural deposits;
Discharge from metal refineries; runoff from waste batteries and
paints. |
|
Chromium
|
100ppb
|
100 ppb
|
<0.001
|
-
|
Discharge
from steel and pulp mills; Erosion of natural deposits. |
|
Copper
|
AL=1.3
ppm
|
AL=1.3 ppm
|
0.004
|
-
|
Corrosion
of household plumbing systems; Erosion of natural deposits; Leaching
from wood preservatives. |
|
Fluoride
|
4 ppm
|
4 ppm
|
2.18
|
0.07 – 2.18
|
Erosion
of natural deposits; Water additive that promotes strong teeth;
Discharge from fertilizer and aluminum factories. |
|
Lead
|
0 ppb
|
AL=15 ppb
|
<0.002
|
-
|
Corrosion
of household plumbing systems; Erosion of natural deposits. |
|
Mercury (inorganic)
|
2 ppb
|
2 ppb
|
<0.0005
|
-
|
Erosion
of natural deposits; Discharge from refineries and factories;
Runoff from landfills; Runoff from cropland. |
|
Nitrate
(as Nitrogen)
|
10 ppm
|
10 ppm
|
2.56
|
-
|
Runoff
from fertilizer use; Leaching from septic tanks, sewage; Erosion
of natural deposits. |
|
Nitrite
(as Nitrogen)
|
1 ppm
|
1 ppm
|
<0.01
|
-
|
Runoff
from fertilizer use; Leaching from septic tanks, sewage; natural
erosion. |
|
Selenium
|
50 ppb
|
50 ppb
|
<0.005
|
-
|
Discharge
from petroleum and metal refineries; Erosion of natural deposits;
Discharge from mines. |
|
Thallium
|
0.5 ppb
|
2 ppb
|
<0.001
|
-
|
Leaching from ore-processing
sites; Discharge from electronics, glass, and drug factories. |
