Statutes, codes, and regulations
Indiana Administrative Code
Title 327 - WATER POLLUTION CONTROL DIVISIONArticle 2 - WATER QUALITY STANDARDS
Rule 327 IAC 2-11 - Ground Water Quality Standards
Section 327 IAC 2-11-6 - Criteria for drinking water class ground water

327 Ind. Admin. Code 2-11-6

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Current through January 8, 2025
Section 327 IAC 2-11-6 - Criteria for drinking water class ground water

Authority: IC 13-18

Affected: IC 4-22-2; IC 13-14-9; IC 13-18-4; IC 13-18-17

Sec. 6.

(a) The following numeric criteria are health protective goals for untreated ground water used as drinking water and are the maximum permissible level of a contaminant in drinking water class ground water:
(1) The following are the numeric criteria for select inorganic contaminants:

Contaminant

Criterion (mg/l unless noted)1

Antimony

0.006

Arsenic

0.010

Asbestos

7 MFL2

Barium

2

Contaminant

Criterion (mg/l unless noted)

Beryllium

0.004

Cadmium

0.005

Chromium (total)

0.1

Combined beta/photon emitters

4 mrem/yr3

Cyanide (free)

0.2

Fluoride

4

Gross alpha particle activity (including radium 226 but excluding radon and uranium)

15 pCi/L4

Lead

0.015

Mercury (inorganic)

0.002

Nitrate (as N)

10

Nitrite (as N)

1

Radium 226 and 228 (combined)

5 pCi/L

Selenium

0.05

Thallium

0.002

Notes:

1mg/l is milligrams per liter.

2MFL is million fibers per liter greater than 10 micrometers in length.

3mrem/yr is millirems per year.

4pCi/L is picocuries per liter.

(2) The following are the numeric criteria for select organic contaminants:

Table 6(a)(2)

Numeric Criteria for Organic Contaminants in Drinking Water Class Ground Water

Chemical Abstract Registry Numbers

Contaminant

Criterion (mg/l unless noted)

15972-60-8

Alachlor

0.002

1912-24-9

Atrazine

0.003

71-43-2

Benzene

0.005

50-32-8

Benzo(a)pyrene

0.0002

1563-66-2

Carbofuran

0.04

56-23-5

Carbon tetrachloride

0.005

57-74-9

Chlordane

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 (DBCP)

0.0002

95-50-1

Dichlorobenzene, 1,2-

0.6

106-46-7

Dichlorobenzene, 1,4-

0.075

107-06-2

Dichloroethane, 1,2-

0.005

75-35-4

Dichloroethylene, 1,1-

0.007

156-59-2

Dichloroethylene, cis-1,2-

0.07

156-60-5

Dichloroethylene, trans-1,2-

0.1

75-09-2

Dichloromethane or methylene chloride

0.005

78-87-5

Dichloropropane, 1,2-

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 (EDB)

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 (gamma-BHC)

0.0002

72-43-5

Methoxychlor

0.04

108-90-7

Monochlorobenzene

0.1

23135-22-0

Oxamyl (vydate)

0.2

87-89-5

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)

0.00000003

127-18-4

Tetrachloroethylene

0.005

108-88-3

Toluene

1

8001-35-2

Toxaphene

0.003

93-72-1

2,4,5-TP (Silvex)

0.05

120-82-1

Trichlorobenzene, 1,2,4-

0.07

71-55-6

Trichloroethane, 1,1,1-

0.2

79-00-5

Trichloroethane, 1,1,2-

0.005

79-01-6

Trichloroethylene

0.005

75-01-4

Vinyl chloride

0.002

1330-20-7

Xylenes (total)

10

(3) A drinking water class numeric criterion may be added to the criteria established in this subsection if adopted according to IC 4-22-2 and IC 13-14-9.
(b) An agency shall determine if further action is necessary to comply with the narrative criteria established in section 5 of this rule if the following indicator levels are exceeded in drinking water class ground water:
(1) Chloride at two hundred fifty (250) milligrams per liter.
(2) Sulfate at two hundred fifty (250) milligrams per liter.
(3) Total dissolved solids at five hundred (500) milligrams per liter.
(4) Total coliform bacteria at nondetect.
(c) If the commissioner determines that a site-specific numeric criterion for a contaminant without a drinking water class numeric criterion established in subsection (a) is necessary to protect human health, any natural resource, or the environment, a risk analysis shall be used to establish a numeric criterion for that contaminant and must:
(1) receive approval from the commissioner; and
(2) be based upon appropriate toxicological data.
(d) The naturally occurring concentration of a contaminant in drinking water class ground water shall be the numeric criterion if that contaminant occurs at a concentration greater than the drinking water numeric criterion established in subsection (a) or (c) or an indicator level established in subsection (b).
(e) If drinking water class ground water at a facility, practice, or activity is determined to have one (1) or more contaminant concentrations above the numeric criteria established in this section that are not attributable to the facility, practice, or activity under consideration, an agency shall manage the facility, practice, or activity or implement programs such that:
(1) the facility, practice, or activity causes no further increase in the concentration of the contaminant determined to be above the numeric criterion established in this section; and
(2) any design standard or management requirements that apply to the facility, practice, or activity are at least as stringent as the design standard and management requirements that would be applied to a facility, practice, or activity where ground water does not have one (1) or more contaminant concentrations above the numeric criteria established in this section.
(f) The commissioner may, for a ground water contamination assessment or remediation at a facility, practice, or activity under the jurisdiction of the department of environmental management, allow an appropriate site-specific, risk-based numeric criterion different from the numeric criterion established in subsection (a) or (d) to be applied to drinking water class ground water within the boundary of the ground water management zone established according to section 9 of this rule.

327 IAC 2-11-6

Water Pollution Control Board; 327 IAC 2-11-6; filed Feb 4, 2002, 11:00 a.m.: 25 IR 1879; readopted filed Jun 4, 2008, 11:07 a.m.: 20080702-IR-327080207BFA; filed Nov 24, 2008, 12:30 p.m.: 20081217-IR-327060280FRA
Readopted filed Jul 30, 2014, 4:04 p.m.: 20140827-IR-327140189BFA
Readopted filed 5/27/2020, 11:52 a.m.: 20200624-IR-327200186BFA
Readopted filed 10/18/2024, 1:57 p.m.: 20241113-IR-327230810RFA