Table 2
Recommended Limit
Number of
Number of
(in mg/l unless
Communities
COmmunities
_
otherwise
Exceeding
Mandatory Limit
Exceeding
Contaminant
specified)
Recommended Limit
(in mg/l)
Mandatory Limit
Biological Coliform
*
l 20
Organic Chemical
CCE (carbonchloroform extract)a
0.2
l 2
Inorganic Chemical
Arsenic
0.01
2
0
. 05
2
Barium
l
l
Boronb
l .0
9
5.0
Cadmium
0.01
3
Chloride
250.0
9
Chromium
(hexavalent)
0.05
4
Copper
1.0
l l
:
Fluoride
0,8—l .7°
52
i.4—2.4
24
Iron
0.3
96
Lead
0.05
14
Manganese
0.05
90
Nitrate
45.0
1 9
:
Selenium
0.01
5
Sulfate
250.0
25
Zinc
5.0
1
Particulate
Total dissolved
solids
500
95
»
.
Turbidity in
*
untreated water
5 UHÏÎS
26
treated water
l unit
26
\
Radioactive
Radium 226“
3 pC/l
15 units
7
°Arithmetic average coliform density no greater than one per hundred milliliters, or two or more samples
(fi v;æ1
percent if more than 20 examined) greater than four per hundred milliliters when using membrane lter
tec nique.
“ Water is rst ltered through activated charcoal and organics are extracted in chloroform. Only 110 of the
969 Water systems in the study were tested for organic chemicals.
“ Not included in 1962 PHS standards, but proposed.
‘ Standard varies with temperature.
dRadium 226 is a naturally occurring radioisotope found in the water in areas where the rock is high in
radium. Radioactivity is measured in curies, or fractions thereof. A picocurie (pC) is a millionth of a millionth
of & curie.
“17
196 Appendix
-
,,
,,,
,,,
,,,,
,,
_,
,
,
,
,,,
,,,
Recommended Limit
Number of
Number of
(in mg/l unless
Communities
COmmunities
_
otherwise
Exceeding
Mandatory Limit
Exceeding
Contaminant
specified)
Recommended Limit
(in mg/l)
Mandatory Limit
Biological Coliform
*
l 20
Organic Chemical
CCE (carbonchloroform extract)a
0.2
l 2
Inorganic Chemical
Arsenic
0.01
2
0
. 05
2
Barium
l
l
Boronb
l .0
9
5.0
Cadmium
0.01
3
Chloride
250.0
9
Chromium
(hexavalent)
0.05
4
Copper
1.0
l l
:
Fluoride
0,8—l .7°
52
i.4—2.4
24
Iron
0.3
96
Lead
0.05
14
Manganese
0.05
90
Nitrate
45.0
1 9
:
Selenium
0.01
5
Sulfate
250.0
25
Zinc
5.0
1
Particulate
Total dissolved
solids
500
95
»
.
Turbidity in
*
untreated water
5 UHÏÎS
26
treated water
l unit
26
\
Radioactive
Radium 226“
3 pC/l
15 units
7
°Arithmetic average coliform density no greater than one per hundred milliliters, or two or more samples
(fi v;æ1
percent if more than 20 examined) greater than four per hundred milliliters when using membrane lter
tec nique.
“ Water is rst ltered through activated charcoal and organics are extracted in chloroform. Only 110 of the
969 Water systems in the study were tested for organic chemicals.
“ Not included in 1962 PHS standards, but proposed.
‘ Standard varies with temperature.
dRadium 226 is a naturally occurring radioisotope found in the water in areas where the rock is high in
radium. Radioactivity is measured in curies, or fractions thereof. A picocurie (pC) is a millionth of a millionth
of & curie.
“17
196 Appendix
-
,,
,,,
,,,
,,,,
,,
_,
,
,
,
,,,
,,,