Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.11 - GROUND WATER QUALITY RULE › Section 58.01.11.200 - GROUND WATER QUALITY STANDARDS

Current through August 31, 2023
The following numerical and narrative standards apply to all
				ground water of the state and shall not be exceeded unless otherwise allowed in
				this rule. (3-24-22)
01.
Numerical Ground Water Quality Standards
. (3-24-22)
a. The Primary Constituent Standards are
			 based on protection of human health and are identified in Table II.
Table II - Primary Constituent
							 Standards
Chemical Abstract Service
							 Number
Constituent
Standard (mg/l unless otherwise
							 specified)
7440-36-0
Antimony
0.006
7440-38-2
Arsenic
0.05
1332-21-4
Asbestos
7 million fibers/l longer than 10 um
7440-39-3
Barium
2
7440-41-7
Beryllium
0.004
7440-43-9
Cadmium
0.005
7440-47-3
Chromium
0.1
7440-50-8
Copper
1.3
57-12-5
Cyanide
0.2
16984-48-8
Fluoride
4
7439-92-1
Lead
0.015
7439-97-6
Mercury
0.002
*1
Nitrate (as N)
10
*1
Nitrite (as N)
1
*1
Nitrate and Nitrite (both as N)
10
7782-49-2
Selenium
0.05
7440-28-0
Thallium
0.002
15972-60-8
Alachlor
0.002
1912-24-9
Atrazine
0.003
71-43-2
Benzene
0.005
50-32-8
Benzo(a)pyrene (PAH)
0.0002
75-27-4
Bromodichloromethane (THM)
0.1
75-25-2
Bromoform (THM)
0.1
1563-66-2
Carbofuran
0.04
56-23-5
Carbon Tetrachloride
0.005
57-74-9
Chlordane
0.002
124-48-1
Chlorodibromomethane (THM)
0.1
67-66-3
Chloroform(THM)
0.002
94-75-7
2,4-D
0.07
75-99-0
Dalapon
0.2
103-23-1
Di(2-ethylhexyl) adipate
0.4
96-12-8
Dibromochloropropane
0.0002
541-73-1
Dichlorobenzene m-
0.6
95-50-1
Dichlorobenzene o-
0.6
106-46-7
1,4(para)-Dichlorobenzene or Dichlorobenzene
							 p-
0.075
107-06-2
1,2-Dichloroethane
0.005
75-35-4
1,1-Dichloroethylene
0.007
156-59-2
cis-1, 2-Dichloroethylene
0.07
156-60-5
trans-1, 2-Dichloroethylene
0.1
75-09-2
Dichloromethane
0.005
78-87-5
1,2-Dichloropropane
0.005
117-81-7
Di(2-ethylhexyl)phthalate
0.006
88-85-7
Dinoseb
0.007
85-00-7
Diquat
0.02
145-73-3
Endothall
0.1
72-20-8
Endrin
0.002
100-41-4
Ethylbenzene
0.7
106-93-4
Ethylene dibromide
0.00005
1071-83-6
Glyphosate
0.7
76-44-8
Heptachlor
0.0004
1024-57-3
Heptachlor epoxide
0.0002
118-74-1
Hexachlorobenzene
0.001
77-47-4
Hexachlorocyclopentadiene
0.05
58-89-9
Lindane
0.0002
72-43-5
Methoxychlor
0.04
108-90-7
Monochlorobenzene
0.1
23135-22-0
Oxamyl (Vydate)
0.2
87-86-5
Pentachlorophenol
0.001
1918-02-1
Picloram
0.5
1336-36-3
Polychlorinated biphenyls (PCBs)
0.0005
122-34-9
Simazine
0.004
100-42-5
Styrene
0.1
1746-01-6
2,3,7,8-TCDD (Dioxin)
3.0 x 10-8
127-18-4
Tetrachloroethylene
0.005
108-88-3
Toluene
1
*1
Total Trihalomethanes [the sum of the concentrations
							 of bromodichloromethane, dibromochloromethane, tribromomethane (bromoform), and
							 trichloromethane (chloroform)]
0.1
8001-35-2
Toxaphene
0.003
93-72-1
2,4,5-TP (Silvex)
0.05
120-82-1
1,2,4-Trichlorobenzene
0.07
71-55-6
1,1,1-Trichloroethane
0.2
79-00-5
1,1,2-Trichloroethane
0.005
79-01-6
Trichloroethylene
0.005
75-01-4
Vinyl Chloride
0.002
1330-20-7
Xylenes (total)
10
*1
Gross alpha particle activity (including radium -226,
							 but excluding radon and uranium)
15 pCi/l
*1
Combined beta/photon emitters
4 millirems/year effective dose
							 equivalent
*1
Combined Radium - 226 and radium 228
5 pCi/l
*1
Strontium 90
8 pCi/l
*1
Tritium
20,000 pCi/l
*1
Total
							 Coliform2
1 colony forming unit/100 ml
Escherichia coliform (E. coli)
Less than 1 viable colony or colony forming unit/100
							 ml using any EPA approved method
Fecal coliform
Less than 1 viable colony or colony forming unit/100
							 ml using any EPA approved method
Table Footnotes
*1 No Chemical Abstract
							 Service Number exists for this constituent.
2 An exceedance of the
							 primary ground water quality standard for total coliform is not a violation of
							 these rules. If the primary ground water quality standard for total coliform is
							 exceeded, additional analysis for fecal coliform or E. coli will be conducted.
							 An exceedance of the primary ground water quality standards for either fecal
							 coliform or E. coli is a violation of these rules.
(3-24-22)
b.
			 The Secondary Constituent Standards are generally based on aesthetic qualities
			 and are identified in Table III.
TABLE III - SECONDARY
							 CONSTITUENT STANDARDS
Constituent
Standard (mg/l unless otherwise
							 specified)
Aluminum
0.2
Chloride
250
Color
15 Color Units
Foaming Agents
0.5
Iron
0.3
Manganese
0.05
Odor
3.0 Threshold Odor Number
PH
6.5 to 8.5 (no units apply)
Silver
0.1
Sulfate
250
Total Dissolved Solids
500
Zinc
5
(3-24-22)
c.
			 Sample preservation and analytical procedures to determine compliance with the
			 standards identified in Subsection
			 200.01 shall be in accordance
			 with the following, except that cyanide shall be analyzed as weak acid
			 dissociable cyanide using a method approved by the Department: (3-24-22)
i. Environmental Protection Agency, Code of
			 Federal Regulations, Title 40, Parts 141 and 143, revised as of July 2001; or
			 (3-24-22)
ii. Another method
			 approved by the Department. (3-24-22)